merge: fix connection issues and locale bugs (v1.7.1)

## Changes

• Fixed: App crash on Android 9 (Issue #15)
• Fixed: German text showing despite English language setting
• Improved: Sync connection stability (10s timeout)
• Improved: Code quality (removed 65 lines)

## Technical Details

- Increased socket timeout from 1s to 10s
- Fixed hardcoded German strings in UI
- Enhanced locale support with AppCompatDelegate
- Removed unreliable VPN bypass code

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,154 @@
+name: "🐛 Bug Report / Fehlerbericht"
+description: Melde einen Fehler in der App / Report a bug in the app
+title: "[BUG] "
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Danke für deinen Bug Report! / Thanks for reporting a bug!
+        
+        Bitte fülle alle relevanten Felder aus. / Please fill out all relevant fields.
+
+  - type: textarea
+    id: description
+    attributes:
+      label: "🐛 Beschreibung / Description"
+      description: Beschreibe den Fehler kurz und präzise / Describe the bug briefly and precisely
+      placeholder: "z.B. Auto-Sync funktioniert nicht mehr nach App-Update / e.g. Auto-sync stopped working after app update"
+    validations:
+      required: true
+
+  - type: dropdown
+    id: android-version
+    attributes:
+      label: "📱 Android Version"
+      description: Welche Android Version verwendest du? / Which Android version are you using?
+      options:
+        - Android 16
+        - Android 15
+        - Android 14
+        - Android 13
+        - Android 12
+        - Android 11
+        - Android 10
+        - Android 9
+        - Android 8.1
+        - Android 8.0
+        - Andere / Other
+    validations:
+      required: true
+
+  - type: input
+    id: app-version
+    attributes:
+      label: "📲 App Version"
+      description: Welche Version der App verwendest du? (Einstellungen → Über) / Which app version? (Settings → About)
+      placeholder: "z.B. / e.g. v1.1.0"
+    validations:
+      required: true
+
+  - type: input
+    id: device
+    attributes:
+      label: "📱 Gerät / Device"
+      description: Welches Gerät verwendest du? / Which device are you using?
+      placeholder: "z.B. Samsung Galaxy S21, Google Pixel 7, etc."
+    validations:
+      required: false
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: "📋 Schritte zum Reproduzieren / Steps to Reproduce"
+      description: Wie kann der Fehler reproduziert werden? / How can the bug be reproduced?
+      placeholder: |
+        1. Öffne die App / Open the app
+        2. Gehe zu Einstellungen / Go to settings
+        3. Klicke auf ... / Click on ...
+        4. Fehler tritt auf / Bug occurs
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: "✅ Erwartetes Verhalten / Expected Behavior"
+      description: Was sollte passieren? / What should happen?
+      placeholder: "z.B. Notizen sollten alle 30 Min synchronisiert werden / e.g. Notes should sync every 30 min"
+    validations:
+      required: true
+
+  - type: textarea
+    id: actual
+    attributes:
+      label: "❌ Tatsächliches Verhalten / Actual Behavior"
+      description: Was passiert stattdessen? / What happens instead?
+      placeholder: "z.B. Sync funktioniert nicht, keine Notification / e.g. Sync doesn't work, no notification"
+    validations:
+      required: true
+
+  - type: dropdown
+    id: sync-enabled
+    attributes:
+      label: Auto-Sync aktiviert? / Auto-Sync enabled?
+      options:
+        - "Ja / Yes"
+        - "Nein / No"
+    validations:
+      required: false
+
+  - type: dropdown
+    id: battery-optimization
+    attributes:
+      label: 🔋 Akku-Optimierung deaktiviert? / Battery optimization disabled?
+      description: Einstellungen → Apps → Simple Notes → Akku → Nicht optimieren / Settings → Apps → Simple Notes → Battery → Don't optimize
+      options:
+        - "Ja, deaktiviert / Yes, disabled"
+        - "Nein, noch optimiert / No, still optimized"
+        - "Weiß nicht / Don't know"
+    validations:
+      required: false
+
+  - type: textarea
+    id: server-config
+    attributes:
+      label: 🌐 Server-Konfiguration / Server Configuration
+      description: Falls relevant / If relevant (KEINE Passwörter! / NO passwords!)
+      placeholder: |
+        - Server läuft lokal / Server runs locally
+        - Docker auf Raspberry Pi / Docker on Raspberry Pi
+        - Gleiche WiFi / Same WiFi
+        - Server-IP: 192.168.x.x (erste 3 Zahlen reichen / first 3 numbers sufficient)
+    validations:
+      required: false
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: 📋 Logs / Screenshots
+      description: |
+        Falls vorhanden: Screenshots oder LogCat Output / If available: Screenshots or LogCat output
+        
+        LogCat Filter: `adb logcat -s SyncWorker NetworkMonitor WebDavSyncService`
+      placeholder: "Füge hier Logs oder Screenshots ein / Paste logs or screenshots here"
+    validations:
+      required: false
+
+  - type: textarea
+    id: additional
+    attributes:
+      label: 🔧 Zusätzliche Informationen / Additional Context
+      description: Gibt es noch etwas, das wir wissen sollten? / Is there anything else we should know?
+    validations:
+      required: false
+
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: ✅ Checklist
+      options:
+        - label: Ich habe die [Troubleshooting-Sektion](https://github.com/inventory69/simple-notes-sync/blob/main/QUICKSTART.md#troubleshooting) gelesen / I have read the troubleshooting section
+          required: false
+        - label: Ich habe "Verbindung testen" in den Einstellungen probiert / I have tried "Test connection" in settings
+          required: false

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,14 @@
+blank_issues_enabled: true
+contact_links:
+  - name: "📖 Dokumentation / Documentation"
+    url: https://github.com/inventory69/simple-notes-sync/blob/main/README.md
+    about: Schau zuerst in die Dokumentation / Check documentation first
+  - name: "🚀 Quick Start Guide"
+    url: https://github.com/inventory69/simple-notes-sync/blob/main/QUICKSTART.md
+    about: Schritt-für-Schritt Anleitung / Step-by-step guide
+  - name: "🐛 Troubleshooting"
+    url: https://github.com/inventory69/simple-notes-sync/blob/main/QUICKSTART.md#troubleshooting
+    about: Häufige Probleme und Lösungen / Common issues and solutions
+  - name: "✨ Feature Requests & Ideas"
+    url: https://github.com/inventory69/simple-notes-sync/discussions/categories/ideas
+    about: Diskutiere neue Features in Discussions / Discuss new features in Discussions

.github/ISSUE_TEMPLATE/question.yml

@@ -0,0 +1,76 @@
+name: "❓ Question / Frage"
+description: Stelle eine Frage zur Nutzung / Ask a question about usage
+title: "[QUESTION] "
+labels: ["question"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Hast du eine Frage? Wir helfen gerne! / Have a question? We're happy to help!
+
+  - type: textarea
+    id: question
+    attributes:
+      label: "❓ Frage / Question"
+      description: Was möchtest du wissen? / What would you like to know?
+      placeholder: "z.B. Wie kann ich die Sync-URL für einen externen Server konfigurieren? / e.g. How can I configure the sync URL for an external server?"
+    validations:
+      required: true
+
+  - type: checkboxes
+    id: documentation-checked
+    attributes:
+      label: "📚 Dokumentation gelesen / Documentation checked"
+      description: Hast du bereits in der Dokumentation nachgeschaut? / Have you already checked the documentation?
+      options:
+        - label: Ich habe die [README](https://github.com/inventory69/simple-notes-sync/blob/main/README.md) gelesen / I have read the README
+          required: false
+        - label: Ich habe den [Quick Start Guide](https://github.com/inventory69/simple-notes-sync/blob/main/QUICKSTART.md) gelesen / I have read the Quick Start Guide
+          required: false
+        - label: Ich habe das [Troubleshooting](https://github.com/inventory69/simple-notes-sync/blob/main/QUICKSTART.md#troubleshooting) durchgearbeitet / I have checked the troubleshooting section
+          required: false
+
+  - type: textarea
+    id: tried
+    attributes:
+      label: "🔍 Was hast du bereits versucht? / What have you already tried?"
+      description: Hilf uns, dir besser zu helfen / Help us help you better
+      placeholder: "z.B. Ich habe versucht die Server-URL anzupassen, aber... / e.g. I tried adjusting the server URL, but..."
+    validations:
+      required: false
+
+  - type: dropdown
+    id: topic
+    attributes:
+      label: "📌 Thema / Topic"
+      description: Um was geht es? / What is this about?
+      options:
+        - Server Setup / Server-Einrichtung
+        - App-Konfiguration / App configuration
+        - Sync-Probleme / Sync issues
+        - Netzwerk / Network
+        - Android-Einstellungen / Android settings
+        - Andere / Other
+    validations:
+      required: false
+
+  - type: textarea
+    id: context
+    attributes:
+      label: "💬 Kontext / Context"
+      description: Zusätzliche Informationen die hilfreich sein könnten / Additional information that might be helpful
+      placeholder: |
+        - Android Version: Android 13
+        - App Version: v1.1.0
+        - Server: Raspberry Pi mit Docker / Raspberry Pi with Docker
+        - Netzwerk: Lokales WiFi / Local WiFi
+    validations:
+      required: false
+
+  - type: textarea
+    id: additional
+    attributes:
+      label: "🔧 Screenshots / Config"
+      description: Falls hilfreich (KEINE Passwörter!) / If helpful (NO passwords!)
+    validations:
+      required: false

.github/workflows/build-debug-apk.yml

@@ -0,0 +1,87 @@
+name: Build Debug APK
+
+on:
+  push:
+    branches: 
+      - 'debug/**'
+      - 'fix/**'
+      - 'feature/**'
+  workflow_dispatch:  # Manueller Trigger möglich
+
+jobs:
+  build-debug:
+    name: Build Debug APK
+    runs-on: ubuntu-latest
+    
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      
+      - name: Setup Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '17'
+      
+      - name: Extract version info
+        run: |
+          VERSION_NAME=$(grep "versionName = " android/app/build.gradle.kts | sed 's/.*versionName = "\(.*\)".*/\1/')
+          VERSION_CODE=$(grep "versionCode = " android/app/build.gradle.kts | sed 's/.*versionCode = \([0-9]*\).*/\1/')
+          BRANCH_NAME=${GITHUB_REF#refs/heads/}
+          COMMIT_SHA=$(git rev-parse --short HEAD)
+          
+          echo "VERSION_NAME=$VERSION_NAME" >> $GITHUB_ENV
+          echo "VERSION_CODE=$VERSION_CODE" >> $GITHUB_ENV
+          echo "BRANCH_NAME=$BRANCH_NAME" >> $GITHUB_ENV
+          echo "COMMIT_SHA=$COMMIT_SHA" >> $GITHUB_ENV
+          echo "BUILD_TIME=$(date +'%Y-%m-%d_%H-%M-%S')" >> $GITHUB_ENV
+      
+      - name: Build Debug APK (Standard + F-Droid)
+        run: |
+          cd android
+          ./gradlew assembleStandardDebug assembleFdroidDebug --no-daemon --stacktrace
+      
+      - name: Prepare Debug APK artifacts
+        run: |
+          mkdir -p debug-apks
+          
+          cp android/app/build/outputs/apk/standard/debug/app-standard-debug.apk \
+             debug-apks/simple-notes-sync-v${{ env.VERSION_NAME }}-${{ env.COMMIT_SHA }}-standard-debug.apk
+          
+          cp android/app/build/outputs/apk/fdroid/debug/app-fdroid-debug.apk \
+             debug-apks/simple-notes-sync-v${{ env.VERSION_NAME }}-${{ env.COMMIT_SHA }}-fdroid-debug.apk
+          
+          echo "✅ Debug APK Files ready:"
+          ls -lh debug-apks/
+      
+      - name: Upload Debug APK Artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: simple-notes-sync-debug-v${{ env.VERSION_NAME }}-${{ env.BUILD_TIME }}
+          path: debug-apks/*.apk
+          retention-days: 30  # Debug Builds länger aufbewahren
+          compression-level: 0  # APK ist bereits komprimiert
+      
+      - name: Create summary
+        run: |
+          echo "## 🐛 Debug APK Build" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "### Build Info" >> $GITHUB_STEP_SUMMARY
+          echo "- **Version:** v${{ env.VERSION_NAME }} (Code: ${{ env.VERSION_CODE }})" >> $GITHUB_STEP_SUMMARY
+          echo "- **Branch:** ${{ env.BRANCH_NAME }}" >> $GITHUB_STEP_SUMMARY
+          echo "- **Commit:** ${{ env.COMMIT_SHA }}" >> $GITHUB_STEP_SUMMARY
+          echo "- **Built:** ${{ env.BUILD_TIME }}" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "### Download" >> $GITHUB_STEP_SUMMARY
+          echo "Debug APK available in the Artifacts section above (expires in 30 days)" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "### Installation" >> $GITHUB_STEP_SUMMARY
+          echo "\`\`\`bash" >> $GITHUB_STEP_SUMMARY
+          echo "# Enable unknown sources" >> $GITHUB_STEP_SUMMARY
+          echo "adb install simple-notes-sync-*-debug.apk" >> $GITHUB_STEP_SUMMARY
+          echo "\`\`\`" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "### What's included?" >> $GITHUB_STEP_SUMMARY
+          echo "- Full Logging enabled" >> $GITHUB_STEP_SUMMARY
+          echo "- Not production signed" >> $GITHUB_STEP_SUMMARY
+          echo "- May have performance impact" >> $GITHUB_STEP_SUMMARY

.github/workflows/build-production-apk.yml

@@ -2,11 +2,11 @@ name: Build Android Production APK
 
 on:
   push:
-    branches: [ main ]  # Trigger on push to main branch
-  workflow_dispatch:  # Allow manual trigger
+    branches: [ main ]  # Only trigger on push/merge to main
+  workflow_dispatch:  # Enables manual trigger
 
 permissions:
-  contents: write  # Required for creating releases
+  contents: write  # Required for release creation
 
 jobs:
   build:
@@ -23,30 +23,27 @@ jobs:
           distribution: 'temurin'
           java-version: '17'
       
-      - name: Generate Production version number
+      - name: Extract semantic version from build.gradle.kts
         run: |
-          # Generate semantic version: YYYY.MM.DD
-          VERSION_NAME="$(date +'%Y.%m.%d')"
+          # Version from build.gradle.kts for F-Droid compatibility
+          VERSION_NAME=$(grep "versionName = " android/app/build.gradle.kts | sed 's/.*versionName = "\(.*\)".*/\1/')
+          VERSION_CODE=$(grep "versionCode = " android/app/build.gradle.kts | sed 's/.*versionCode = \([0-9]*\).*/\1/')
           
-          # Use GitHub run number as build number for production
-          BUILD_NUMBER="${{ github.run_number }}"
+          # Semantic versioning (not date-based)
+          BUILD_NUMBER="$VERSION_CODE"
           
           echo "VERSION_NAME=$VERSION_NAME" >> $GITHUB_ENV
           echo "BUILD_NUMBER=$BUILD_NUMBER" >> $GITHUB_ENV
-          echo "VERSION_TAG=v$VERSION_NAME-prod.$BUILD_NUMBER" >> $GITHUB_ENV
+          echo "VERSION_TAG=v$VERSION_NAME" >> $GITHUB_ENV
           
-          echo "🚀 Generated PRODUCTION version: $VERSION_NAME+$BUILD_NUMBER"
+          echo "🚀 Building version: $VERSION_NAME (Code: $BUILD_NUMBER)"
       
-      - name: Update build.gradle.kts with Production version
+      - name: Verify version from build.gradle.kts
         run: |
-          # Update versionCode and versionName in build.gradle.kts
-          sed -i "s/versionCode = [0-9]*/versionCode = ${{ env.BUILD_NUMBER }}/" android/app/build.gradle.kts
-          sed -i "s/versionName = \".*\"/versionName = \"${{ env.VERSION_NAME }}\"/" android/app/build.gradle.kts
-          
-          echo "✅ Updated build.gradle.kts:"
+          echo "✅ Using version from build.gradle.kts:"
           grep -E "versionCode|versionName" android/app/build.gradle.kts
       
-      - name: Setup Android signing
+      - name: Configure Android signing
         run: |
           echo "${{ secrets.KEYSTORE_BASE64 }}" | base64 -d > android/app/simple-notes-release.jks
           echo "storePassword=${{ secrets.KEYSTORE_PASSWORD }}" > android/key.properties
@@ -55,26 +52,22 @@ jobs:
           echo "storeFile=simple-notes-release.jks" >> android/key.properties
           echo "✅ Signing configuration created"
       
-      - name: Build Production APK (Release)
+      - name: Build production APK (Standard + F-Droid Flavors)
         run: |
           cd android
-          ./gradlew assembleRelease --no-daemon --stacktrace
+          ./gradlew assembleStandardRelease assembleFdroidRelease --no-daemon --stacktrace
       
-      - name: Copy APK variants to root with version names
+      - name: Copy APK variants with version names
         run: |
           mkdir -p apk-output
           
-          # Universal APK
-          cp android/app/build/outputs/apk/release/app-universal-release.apk \
-             apk-output/simple-notes-sync-v${{ env.VERSION_NAME }}-universal.apk
+          # Standard Flavor - Universal APK
+          cp android/app/build/outputs/apk/standard/release/app-standard-release.apk \
+             apk-output/simple-notes-sync-v${{ env.VERSION_NAME }}-standard.apk
           
-          # ARM64 APK
-          cp android/app/build/outputs/apk/release/app-arm64-v8a-release.apk \
-             apk-output/simple-notes-sync-v${{ env.VERSION_NAME }}-arm64-v8a.apk
-          
-          # ARMv7 APK
-          cp android/app/build/outputs/apk/release/app-armeabi-v7a-release.apk \
-             apk-output/simple-notes-sync-v${{ env.VERSION_NAME }}-armeabi-v7a.apk
+          # F-Droid Flavor - Universal APK
+          cp android/app/build/outputs/apk/fdroid/release/app-fdroid-release.apk \
+             apk-output/simple-notes-sync-v${{ env.VERSION_NAME }}-fdroid.apk
           
           echo "✅ APK files prepared:"
           ls -lh apk-output/
@@ -86,113 +79,78 @@ jobs:
           path: apk-output/*.apk
           retention-days: 90  # Keep production builds longer
       
-      - name: Get commit info
+      - name: Extract commit information
         run: |
           echo "SHORT_SHA=$(git rev-parse --short HEAD)" >> $GITHUB_ENV
           echo "COMMIT_DATE=$(git log -1 --format=%cd --date=iso-strict)" >> $GITHUB_ENV
       
-          # Get full commit message preserving newlines and emojis (UTF-8)
-          {
-            echo 'COMMIT_MSG<<EOF'
-            git -c core.quotepath=false log -1 --pretty=%B
-            echo 'EOF'
-          } >> $GITHUB_ENV
+      - name: Read F-Droid changelogs
+        run: |
+          # Read German changelog (main language) - Use printf to ensure proper formatting
+          if [ -f "fastlane/metadata/android/de-DE/changelogs/${{ env.BUILD_NUMBER }}.txt" ]; then
+            CHANGELOG_CONTENT=$(cat "fastlane/metadata/android/de-DE/changelogs/${{ env.BUILD_NUMBER }}.txt")
+            echo "CHANGELOG_DE<<GHADELIMITER" >> $GITHUB_ENV
+            echo "$CHANGELOG_CONTENT" >> $GITHUB_ENV
+            echo "GHADELIMITER" >> $GITHUB_ENV
+          else
+            echo "CHANGELOG_DE=No German release notes available." >> $GITHUB_ENV
+          fi
+          
+          # Read English changelog (optional)
+          if [ -f "fastlane/metadata/android/en-US/changelogs/${{ env.BUILD_NUMBER }}.txt" ]; then
+            CHANGELOG_CONTENT_EN=$(cat "fastlane/metadata/android/en-US/changelogs/${{ env.BUILD_NUMBER }}.txt")
+            echo "CHANGELOG_EN<<GHADELIMITER" >> $GITHUB_ENV
+            echo "$CHANGELOG_CONTENT_EN" >> $GITHUB_ENV
+            echo "GHADELIMITER" >> $GITHUB_ENV
+          else
+            echo "CHANGELOG_EN=" >> $GITHUB_ENV
+          fi
       
       - name: Create Production Release
         uses: softprops/action-gh-release@v1
         with:
           tag_name: ${{ env.VERSION_TAG }}
-          name: "📝 Simple Notes Sync v${{ env.VERSION_NAME }} (Produktions-Release)"
+          name: "📝 Simple Notes Sync v${{ env.VERSION_NAME }}"
           files: apk-output/*.apk
           draft: false
           prerelease: false
           generate_release_notes: false
           body: |
-            # 📝 Produktions-Release: Simple Notes Sync v${{ env.VERSION_NAME }}
+            ## 📋 Changelog / Release Notes
             
-            ## Build-Informationen
+            ${{ env.CHANGELOG_EN }}
             
-            - **Version:** ${{ env.VERSION_NAME }}+${{ env.BUILD_NUMBER }}
-            - **Build-Datum:** ${{ env.COMMIT_DATE }}
+            <details>
+            <summary>🇩🇪 German Version</summary>
+            
+            ${{ env.CHANGELOG_DE }}
+            
+            </details>
+
+            ## 📦 Downloads
+            
+            | Variant | File | Info |
+            |---------|------|------|
+            | **🏆 Recommended** | `simple-notes-sync-v${{ env.VERSION_NAME }}-standard.apk` | Standard version (works on all devices) |
+            | F-Droid | `simple-notes-sync-v${{ env.VERSION_NAME }}-fdroid.apk` | For F-Droid Store |
+            
+            ## 📊 Build Info
+            
+            - **Version:** ${{ env.VERSION_NAME }} (Code: ${{ env.BUILD_NUMBER }})
+            - **Date:** ${{ env.COMMIT_DATE }}
             - **Commit:** ${{ env.SHORT_SHA }}
-            - **Umgebung:** 🟢 **PRODUKTION**
             
-            ---
+            ## 🔐 APK Signature Verification
             
-            ## 📋 Änderungen
+            All APKs are signed with the official release certificate.
             
-            ${{ env.COMMIT_MSG }}
+            **Recommended:** Verify with [AppVerifier](https://github.com/nicholson-lab/AppVerifier) (Android app)
             
-            ---
+            **Expected SHA-256:**
+            ```
+            42:A1:C6:13:BB:C6:73:04:5A:F3:DC:81:91:BF:9C:B6:45:6E:E4:4C:7D:CE:40:C7:CF:B5:66:FA:CB:69:F1:6A
+            ```
             
-            ## 📦 Download & Installation
-            
-            ### Welche APK soll ich herunterladen?
-            
-            | Dein Gerät | Lade diese APK herunter | Größe | Kompatibilität |
-            |------------|------------------------|-------|----------------|
-            | 🤷 Nicht sicher? | `simple-notes-sync-v${{ env.VERSION_NAME }}-universal.apk` | ~5 MB | Funktioniert auf allen Geräten |
-            | Modern (2018+) | `simple-notes-sync-v${{ env.VERSION_NAME }}-arm64-v8a.apk` | ~3 MB | Schneller, kleiner |
-            | Ältere Geräte | `simple-notes-sync-v${{ env.VERSION_NAME }}-armeabi-v7a.apk` | ~3 MB | Ältere ARM-Chips |
-            
-            ### Installationsschritte
-            1. Lade die passende APK aus den Assets unten herunter
-            2. Aktiviere "Installation aus unbekannten Quellen" in den Android-Einstellungen
-            3. Öffne die heruntergeladene APK-Datei
-            4. Folge den Installationsanweisungen
-            5. Konfiguriere die WebDAV-Einstellungen in der App
-            
-            ---
-            
-            ## ⚙️ Funktionen
-            
-            - ✅ Automatische WebDAV-Synchronisation alle 30 Minuten (~0,4% Akku/Tag)
-            - ✅ Intelligente Gateway-Erkennung (automatische Heimnetzwerk-Erkennung)
-            - ✅ Material Design 3 Oberfläche
-            - ✅ Datenschutzorientiert (kein Tracking, keine Analysen)
-            - ✅ Offline-First Architektur
-            
-            ---
-            
-            ## 🔄 Update von vorheriger Version
-            
-            Installiere diese APK einfach über die bestehende Installation - alle Daten und Einstellungen bleiben erhalten.
-            
-            ---
-            
-            ## 📱 Obtanium - Auto-Update App
-            
-            Erhalte automatische Updates mit [Obtanium](https://github.com/ImranR98/Obtanium/releases/latest).
-            
-            **Einrichtung:**
-            1. Installiere Obtanium über den Link oben
-            2. Füge die App mit dieser URL hinzu: `https://github.com/dettmersLiq/simple-notes-sync`
-            3. Aktiviere Auto-Updates
-            
-            ---
-            
-            ## 🆘 Support
-            
-            Bei Problemen oder Fragen öffne bitte ein Issue auf GitHub.
-            
-            ---
-            
-            ## 🔒 Datenschutz & Sicherheit
-            
-            - Alle Daten werden über deinen eigenen WebDAV-Server synchronisiert
-            - Keine Drittanbieter-Analysen oder Tracking
-            - Keine Internet-Berechtigungen außer für WebDAV-Sync
-            - Alle Synchronisationsvorgänge verschlüsselt (HTTPS)
-            - Open Source - prüfe den Code selbst
-            
-            ---
-            
-            ## 🛠️ Erstellt mit
-            
-            - **Sprache:** Kotlin
-            - **UI:** Material Design 3
-            - **Sync:** WorkManager + WebDAV
-            - **Target SDK:** Android 16 (API 36)
-            - **Min SDK:** Android 8.0 (API 26)
+            **[📖 Documentation](https://github.com/inventory69/simple-notes-sync/blob/main/QUICKSTART.md)** · **[🐛 Report Bug](https://github.com/inventory69/simple-notes-sync/issues)**
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/pr-build-check.yml

@@ -0,0 +1,124 @@
+name: PR Build Check
+on:
+  pull_request:
+    branches: [ main ]
+    paths:
+      - 'android/**'
+      - '.github/workflows/pr-build-check.yml'
+jobs:
+  build:
+    name: Build & Test APK
+    runs-on: ubuntu-latest
+    steps:
+      - name: Code auschecken
+        uses: actions/checkout@v4
+      - name: Java einrichten
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '17'
+      - name: Gradle Cache
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+      - name: Version auslesen
+        run: |
+          VERSION_NAME=$(grep "versionName = " android/app/build.gradle.kts | sed 's/.*versionName = "\(.*\)".*/\1/')
+          VERSION_CODE=$(grep "versionCode = " android/app/build.gradle.kts | sed 's/.*versionCode = \([0-9]*\).*/\1/')
+          echo "VERSION_NAME=$VERSION_NAME" >> $GITHUB_ENV
+          echo "VERSION_CODE=$VERSION_CODE" >> $GITHUB_ENV
+          echo "📱 Version: $VERSION_NAME (Code: $VERSION_CODE)"
+      
+      # 🔍 Code Quality Checks (v1.6.1)
+      - name: Run detekt (Code Quality)
+        run: |
+          cd android
+          ./gradlew detekt --no-daemon
+        continue-on-error: false
+      
+      - name: Run ktlint (Code Style)
+        run: |
+          cd android
+          ./gradlew ktlintCheck --no-daemon
+        continue-on-error: true  # Parser-Probleme in Legacy-Code
+      
+      - name: Upload Lint Reports
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: lint-reports-pr-${{ github.event.pull_request.number }}
+          path: |
+            android/app/build/reports/detekt/
+            android/app/build/reports/ktlint/
+            android/app/build/reports/lint-results*.html
+          retention-days: 7
+      
+      - name: Debug Build erstellen (ohne Signing)
+        run: |
+          cd android
+          ./gradlew assembleStandardDebug assembleFdroidDebug --no-daemon --stacktrace
+      - name: Unit Tests ausfuehren
+        run: |
+          cd android
+          ./gradlew test --no-daemon --stacktrace
+        continue-on-error: true
+      - name: Build-Ergebnis pruefen
+        run: |
+          if [ -f "android/app/build/outputs/apk/standard/debug/app-standard-universal-debug.apk" ]; then
+            echo "✅ Standard Debug APK erfolgreich gebaut"
+            ls -lh android/app/build/outputs/apk/standard/debug/*.apk
+          else
+            echo "❌ Standard Debug APK Build fehlgeschlagen"
+            exit 1
+          fi
+          if [ -f "android/app/build/outputs/apk/fdroid/debug/app-fdroid-universal-debug.apk" ]; then
+            echo "✅ F-Droid Debug APK erfolgreich gebaut"
+            ls -lh android/app/build/outputs/apk/fdroid/debug/*.apk
+          else
+            echo "❌ F-Droid Debug APK Build fehlgeschlagen"
+            exit 1
+          fi
+      - name: Debug APKs hochladen (Artefakte)
+        uses: actions/upload-artifact@v4
+        with:
+          name: debug-apks-pr-${{ github.event.pull_request.number }}
+          path: |
+            android/app/build/outputs/apk/standard/debug/*.apk
+            android/app/build/outputs/apk/fdroid/debug/*.apk
+          retention-days: 30
+      - name: Kommentar zu PR hinzufuegen
+        uses: actions/github-script@v7
+        if: success()
+        with:
+          script: |
+            const fs = require('fs');
+            const standardApk = fs.readdirSync('android/app/build/outputs/apk/standard/debug/')
+              .filter(f => f.endsWith('.apk'));
+            const fdroidApk = fs.readdirSync('android/app/build/outputs/apk/fdroid/debug/')
+              .filter(f => f.endsWith('.apk'));
+            github.rest.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: `## ✅ Build erfolgreich!
+            
+            **Version:** ${{ env.VERSION_NAME }} (Code: ${{ env.VERSION_CODE }})
+            
+            ### 📦 Debug APKs (Test-Builds)
+            Die Debug-APKs wurden erfolgreich gebaut und sind als Artefakte verfuegbar:
+            
+            **Standard Flavor:**
+            ${standardApk.map(f => '- \`' + f + '\`').join('\n')}
+            
+            **F-Droid Flavor:**
+            ${fdroidApk.map(f => '- \`' + f + '\`').join('\n')}
+            
+            > ⚠️ **Hinweis:** Dies sind unsigned Debug-Builds zum Testen. Production Releases werden nur bei Merge auf \`main\` erstellt.
+            
+            [📥 Download Artefakte](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})`
+            })

.gitignore

@@ -42,3 +42,10 @@ Thumbs.db
 *.tmp
 *.swp
 *~
+test-apks/
+server-test/
+
+# F-Droid metadata (managed in fdroiddata repo)
+# Exclude fastlane metadata (we want to track those screenshots)
+metadata/
+!fastlane/metadata/

CHANGELOG.de.md

@@ -0,0 +1,682 @@
+# Changelog
+
+Alle wichtigen Änderungen an Simple Notes Sync werden in dieser Datei dokumentiert.
+
+Das Format basiert auf [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+**🌍 Sprachen:** **Deutsch** · [English](CHANGELOG.md)
+
+---
+
+## [1.7.1] - 2026-02-02
+
+### 🐛 Kritische Fehlerbehebungen
+
+#### Android 9 App-Absturz Fix ([#15](https://github.com/inventory69/simple-notes-sync/issues/15))
+
+**Problem:** App stürzte auf Android 9 (API 28) ab wenn WorkManager Expedited Work für Hintergrund-Sync verwendet wurde.
+
+**Root Cause:** Wenn `setExpedited()` in WorkManager verwendet wird, muss die `CoroutineWorker` die Methode `getForegroundInfo()` implementieren um eine Foreground Service Notification zurückzugeben. Auf Android 9-11 ruft WorkManager diese Methode auf, aber die Standard-Implementierung wirft `IllegalStateException: Not implemented`.
+
+**Lösung:** `getForegroundInfo()` in `SyncWorker` implementiert um eine korrekte `ForegroundInfo` mit Sync-Progress-Notification zurückzugeben.
+
+**Details:**
+- `ForegroundInfo` mit Sync-Progress-Notification für Android 9-11 hinzugefügt
+- Android 10+: Setzt `FOREGROUND_SERVICE_TYPE_DATA_SYNC` für korrekte Service-Typisierung
+- Foreground Service Permissions in AndroidManifest.xml hinzugefügt
+- Notification zeigt Sync-Progress mit indeterminiertem Progress Bar
+- Danke an [@roughnecks](https://github.com/roughnecks) für das detaillierte Debugging!
+
+#### VPN-Kompatibilitäts-Fix ([#11](https://github.com/inventory69/simple-notes-sync/issues/11))
+
+- WiFi Socket-Binding erkennt jetzt korrekt Wireguard VPN-Interfaces (tun*, wg*, *-wg-*)
+- Traffic wird korrekt durch VPN-Tunnel geleitet statt direkt über WiFi
+- Behebt "Verbindungs-Timeout" beim Sync zu externen Servern über VPN
+
+### 🔧 Technische Änderungen
+
+- Neue `SafeSardineWrapper` Klasse stellt korrektes HTTP-Connection-Cleanup sicher
+- Weniger unnötige 401-Authentifizierungs-Challenges durch preemptive Auth-Header
+- ProGuard-Regel hinzugefügt um harmlose TextInclusionStrategy-Warnungen zu unterdrücken
+- VPN-Interface-Erkennung via `NetworkInterface.getNetworkInterfaces()` Pattern-Matching
+- Foreground Service Erkennung und Notification-System für Hintergrund-Sync-Tasks
+
+### 🌍 Lokalisierung
+
+- Hardcodierte deutsche Fehlermeldungen behoben - jetzt String-Resources für korrekte Lokalisierung
+- Deutsche und englische Strings für Sync-Progress-Notifications hinzugefügt
+
+---
+
+## [1.7.0] - 2026-01-26
+
+### 🎉 Major: Grid-Ansicht, Nur-WLAN Sync & VPN-Unterstützung
+
+Pinterest-Style Grid, Nur-WLAN Sync-Modus und korrekte VPN-Unterstützung!
+
+### 🎨 Grid-Layout
+
+- Pinterest-Style Staggered Grid ohne Lücken
+- Konsistente 12dp Abstände zwischen Cards
+- Scroll-Position bleibt erhalten nach Einstellungen
+- Neue einheitliche `NoteCardGrid` mit dynamischen Vorschauzeilen (3 klein, 6 groß)
+
+### 📡 Sync-Verbesserungen
+
+- **Nur-WLAN Sync Toggle** - Sync nur wenn WLAN verbunden
+- **VPN-Unterstützung** - Sync funktioniert korrekt bei aktivem VPN (Traffic über VPN)
+- **Server-Wechsel Erkennung** - Alle Notizen auf PENDING zurückgesetzt bei Server-URL Änderung
+- **Schnellere Server-Prüfung** - Socket-Timeout von 2s auf 1s reduziert
+- **"Sync läuft bereits" Feedback** - Zeigt Snackbar wenn Sync bereits läuft
+
+### 🔒 Self-Signed SSL Unterstützung
+
+- **Dokumentation hinzugefügt** - Anleitung für selbst-signierte Zertifikate
+- Nutzt Android's eingebauten CA Trust Store
+- Funktioniert mit ownCloud, Nextcloud, Synology, Home-Servern
+
+### 🔧 Technisch
+
+- `NoteCardGrid` Komponente mit dynamischen maxLines
+- FullLine Spans entfernt für lückenloses Layout
+- `resetAllSyncStatusToPending()` in NotesStorage
+- VPN-Erkennung in `getOrCacheWiFiAddress()`
+
+---
+
+## [1.6.1] - 2026-01-20
+
+### 🧹 Code-Qualität & Build-Verbesserungen
+
+- **detekt: 0 Issues** - Alle 29 Code-Qualitäts-Issues behoben
+  - Triviale Fixes: Unused Imports, MaxLineLength
+  - Datei umbenannt: DragDropState.kt → DragDropListState.kt
+  - MagicNumbers → Constants (Dimensions.kt, SyncConstants.kt)
+  - SwallowedException: Logger.w() für besseres Error-Tracking hinzugefügt
+  - LongParameterList: ChecklistEditorCallbacks data class erstellt
+  - LongMethod: ServerSettingsScreen in Komponenten aufgeteilt
+  - @Suppress Annotationen für Legacy-Code (WebDavSyncService, SettingsActivity)
+
+- **Zero Build Warnings** - Alle 21 Deprecation Warnings eliminiert
+  - File-level @Suppress für deprecated Imports
+  - ProgressDialog, LocalBroadcastManager, AbstractSavedStateViewModelFactory
+  - onActivityResult, onRequestPermissionsResult
+  - Gradle Compose Config bereinigt (StrongSkipping ist jetzt Standard)
+
+- **ktlint reaktiviert** - Linting mit Compose-spezifischen Regeln wieder aktiviert
+  - .editorconfig mit Compose Formatierungsregeln erstellt
+  - Legacy-Dateien ausgeschlossen: WebDavSyncService.kt, build.gradle.kts
+  - ignoreFailures=true für graduelle Migration
+
+- **CI/CD Verbesserungen** - GitHub Actions Lint-Checks integriert
+  - detekt + ktlint + Android Lint laufen vor Build in pr-build-check.yml
+  - Stellt Code-Qualität bei jedem Pull Request sicher
+
+### 🔧 Technische Verbesserungen
+
+- **Constants Refactoring** - Bessere Code-Organisation
+  - ui/theme/Dimensions.kt: UI-bezogene Konstanten
+  - utils/SyncConstants.kt: Sync-Operations Konstanten
+
+- **Vorbereitung für v2.0.0** - Legacy-Code für Entfernung markiert
+  - SettingsActivity und MainActivity (ersetzt durch Compose-Versionen)
+  - Alle deprecated APIs mit Removal-Plan dokumentiert
+
+---
+
+## [1.6.0] - 2026-01-19
+
+### 🎉 Major: Konfigurierbare Sync-Trigger
+
+Feingranulare Kontrolle darüber, wann deine Notizen synchronisiert werden - wähle die Trigger, die am besten zu deinem Workflow passen!
+
+### ⚙️ Sync-Trigger System
+
+- **Individuelle Trigger-Kontrolle** - Jeden Sync-Trigger einzeln in den Einstellungen aktivieren/deaktivieren
+- **5 Unabhängige Trigger:**
+  - **onSave Sync** - Sync sofort nach dem Speichern einer Notiz (5s Throttle)
+  - **onResume Sync** - Sync beim Öffnen der App (60s Throttle)
+  - **WiFi-Connect Sync** - Sync bei WiFi-Verbindung
+  - **Periodischer Sync** - Hintergrund-Sync alle 15/30/60 Minuten (konfigurierbar)
+  - **Boot Sync** - Startet Hintergrund-Sync nach Geräteneustart
+
+- **Smarte Defaults** - Nur ereignisbasierte Trigger standardmäßig aktiv (onSave, onResume, WiFi-Connect)
+- **Akku-optimiert** - ~0.2%/Tag mit Defaults, bis zu ~1.0% mit aktiviertem periodischen Sync
+- **Offline-Modus UI** - Ausgegraute Sync-Toggles wenn kein Server konfiguriert
+- **Dynamischer Settings-Subtitle** - Zeigt Anzahl aktiver Trigger im Haupteinstellungs-Screen
+
+### 🔧 Server-Konfiguration Verbesserungen
+
+- **Offline-Modus Toggle** - Alle Netzwerkfunktionen mit einem Schalter deaktivieren
+- **Getrennte Protokoll & Host Eingabe** - Protokoll (http/https) als nicht-editierbares Präfix angezeigt
+- **Klickbare Settings-Cards** - Gesamte Card klickbar für bessere UX
+- **Klickbare Toggle-Zeilen** - Text/Icon klicken um Switches zu bedienen (nicht nur der Switch selbst)
+
+### 🐛 Bug Fixes
+
+- **Fix:** Fehlender 5. Sync-Trigger (Boot) in der Haupteinstellungs-Screen Subtitle-Zählung
+- **Fix:** Offline-Modus Status wird nicht aktualisiert beim Zurückkehren aus Einstellungen
+- **Fix:** Pull-to-Refresh funktioniert auch im Offline-Modus
+
+### 🔧 Technische Verbesserungen
+
+- **Reaktiver Offline-Modus Status** - StateFlow stellt sicher, dass UI korrekt aktualisiert wird
+- **Getrennte Server-Config Checks** - `hasServerConfig()` vs `isServerConfigured()` (offline-aware)
+- **Verbesserte Konstanten** - Alle Sync-Trigger Keys und Defaults in Constants.kt
+- **Bessere Code-Organisation** - Settings-Screens für Klarheit refactored
+
+### Looking Ahead
+
+> 🚀 **v1.7.0** wird Server-Ordner Prüfung und weitere Community-Features bringen.
+> Feature-Requests sind willkommen als [GitHub Issue](https://github.com/inventory69/simple-notes-sync/issues).
+
+---
+
+## [1.5.0] - 2026-01-15
+
+### 🎉 Major: Jetpack Compose UI Redesign
+
+Das komplette UI wurde von XML-Views auf Jetpack Compose migriert. Die App ist jetzt moderner, schneller und flüssiger.
+
+### 🌍 New Feature: Internationalization (i18n)
+
+- **Englische Sprachunterstützung** - Alle 400+ Strings übersetzt
+- **Automatische Spracherkennung** - Folgt der System-Sprache
+- **Manuelle Sprachauswahl** - In den Einstellungen umschaltbar
+- **Per-App Language (Android 13+)** - Native Spracheinstellung über System-Settings
+- **locales_config.xml** - Vollständige Android-Integration
+
+### ⚙️ Modernized Settings
+
+- **7 kategorisierte Settings-Screens** - Übersichtlicher und intuitiver
+- **Compose Navigation** - Flüssige Übergänge zwischen Screens
+- **Konsistentes Design** - Material Design 3 durchgängig
+
+### ✨ UI Improvements
+
+- **Selection Mode** - Long-Press für Mehrfachauswahl statt Swipe-to-Delete
+- **Batch Delete** - Mehrere Notizen gleichzeitig löschen
+- **Silent-Sync Mode** - Kein Banner bei Auto-Sync (nur bei manuellem Sync)
+- **App Icon in About Screen** - Hochwertige Darstellung
+- **App Icon in Empty State** - Statt Emoji bei leerer Notizliste
+- **Splash Screen Update** - Verwendet App-Foreground-Icon
+- **Slide Animations** - Flüssige Animationen im NoteEditor
+
+### 🔧 Technical Improvements
+
+- **Jetpack Compose** - Komplette UI-Migration
+- **Compose ViewModel Integration** - StateFlow für reactive UI
+- **Improved Code Quality** - Detekt/Lint Warnings behoben
+- **Unused Imports Cleanup** - Sauberer Codebase
+
+### Looking Ahead
+
+> 🚀 **v1.6.0** wird Server-Ordner Prüfung und weitere technische Modernisierungen bringen.
+> Feature-Requests gerne als [GitHub Issue](https://github.com/inventory69/simple-notes-sync/issues) einreichen.
+
+---
+
+## [1.4.1] - 2026-01-11
+
+### Fixed
+
+- **🗑️ Löschen älterer Notizen (v1.2.0 Kompatibilität)**
+  - Notizen aus App-Version v1.2.0 oder früher werden jetzt korrekt vom Server gelöscht
+  - Behebt Problem bei Multi-Device-Nutzung mit älteren Notizen
+
+- **🔄 Checklisten-Sync Abwärtskompatibilität**
+  - Checklisten werden jetzt auch als Text-Fallback im `content`-Feld gespeichert
+  - Ältere App-Versionen (v1.3.x) zeigen Checklisten als lesbaren Text
+  - Format: GitHub-Style Task-Listen (`[ ] Item` / `[x] Item`)
+  - Recovery-Mode: Falls Checklisten-Items verloren gehen, werden sie aus dem Content wiederhergestellt
+
+### Improved
+
+- **📝 Checklisten Auto-Zeilenumbruch**
+  - Lange Checklisten-Texte werden jetzt automatisch umgebrochen
+  - Keine Begrenzung auf 3 Zeilen mehr
+  - Enter-Taste erstellt weiterhin ein neues Item
+
+### Looking Ahead
+
+> 🚀 **v1.5.0** wird das nächste größere Release. Wir sammeln Ideen und Feedback!  
+> Feature-Requests gerne als [GitHub Issue](https://github.com/inventory69/simple-notes-sync/issues) einreichen.
+
+---
+
+## [1.4.0] - 2026-01-10
+
+### 🎉 New Feature: Checklists
+
+- **✅ Checklist Notes**
+  - New note type: Checklists with tap-to-toggle items
+  - Add items via dedicated input field with "+" button
+  - Drag & drop reordering (long-press to activate)
+  - Swipe-to-delete items
+  - Visual distinction: Checked items get strikethrough styling
+  - Type selector when creating new notes (Text or Checklist)
+
+- **📝 Markdown Integration**
+  - Checklists export as GitHub-style task lists (`- [ ]` / `- [x]`)
+  - Compatible with Obsidian, Notion, and other Markdown editors
+  - Full round-trip: Edit in Obsidian → Sync back to app
+  - YAML frontmatter includes `type: checklist` for identification
+
+### Fixed
+
+- **<2A> Markdown Parsing Robustness**
+  - Fixed content extraction after title (was returning empty for some formats)
+  - Now handles single newline after title (was requiring double newline)
+  - Protection: Skips import if parsed content is empty but local has content
+
+- **📂 Duplicate Filename Handling**
+  - Notes with identical titles now get unique Markdown filenames
+  - Format: `title_shortid.md` (e.g., `test_71540ca9.md`)
+  - Prevents data loss from filename collisions
+
+- **🔔 Notification UX**
+  - No sync notifications when app is in foreground
+  - User sees changes directly in UI - no redundant notification
+  - Background syncs still show notifications as expected
+
+### Privacy Improvements
+
+- **🔒 WiFi Permissions Removed**
+  - Removed `ACCESS_WIFI_STATE` permission
+  - Removed `CHANGE_WIFI_STATE` permission
+  - WiFi binding now works via IP detection instead of SSID matching
+  - Cleaned up all SSID-related code from codebase and documentation
+
+### Technical Improvements
+
+- **📦 New Data Model**
+  - `NoteType` enum: `TEXT`, `CHECKLIST`
+  - `ChecklistItem` data class with id, text, isChecked, order
+  - `Note.kt` extended with `noteType` and `checklistItems` fields
+
+- **🔄 Sync Protocol v1.4.0**
+  - JSON format updated to include checklist fields
+  - Full backward compatibility with v1.3.x notes
+  - Robust JSON parsing with manual field extraction
+
+---
+
+## [1.3.2] - 2026-01-10
+
+### Changed
+- **🧹 Code-Qualität: "Clean Slate" Release**
+  - Alle einfachen Lint-Issues behoben (Phase 1-7 des Cleanup-Plans)
+  - Unused Imports und Members entfernt
+  - Magic Numbers durch benannte Konstanten ersetzt
+  - SwallowedExceptions mit Logger.w() versehen
+  - MaxLineLength-Verstöße reformatiert
+  - ConstructorParameterNaming (snake_case → camelCase mit @SerializedName)
+  - Custom Exceptions: SyncException.kt und ValidationException.kt erstellt
+
+### Added  
+- **📝 F-Droid Privacy Notice**
+  - Datenschutz-Hinweis für die Datei-Logging-Funktion
+  - Erklärt dass Logs nur lokal gespeichert werden
+  - Erfüllt F-Droid Opt-in Consent-Anforderungen
+
+### Technical Improvements
+- **⚡ Neue Konstanten für bessere Wartbarkeit**
+  - `SYNC_COMPLETED_DELAY_MS`, `ERROR_DISPLAY_DELAY_MS` (MainActivity)
+  - `CONNECTION_TIMEOUT_MS` (SettingsActivity)
+  - `SOCKET_TIMEOUT_MS`, `MAX_FILENAME_LENGTH`, `ETAG_PREVIEW_LENGTH` (WebDavSyncService)
+  - `AUTO_CANCEL_TIMEOUT_MS` (NotificationHelper)
+  - RFC 1918 IP-Range Konstanten (UrlValidator)
+  - `DAYS_THRESHOLD`, `TRUNCATE_SUFFIX_LENGTH` (Extensions)
+
+- **🔒 @Suppress Annotations für legitime Patterns**
+  - ReturnCount: Frühe Returns für Validierung sind idiomatisch
+  - LoopWithTooManyJumpStatements: Komplexe Sync-Logik dokumentiert
+
+### Notes
+- Komplexe Refactorings (LargeClass, LongMethod) für v1.3.3+ geplant
+- Deprecation-Warnungen (LocalBroadcastManager, ProgressDialog) bleiben bestehen
+
+---
+
+## [1.3.1] - 2026-01-08
+
+### Fixed
+- **🔧 Multi-Device JSON Sync (Danke an Thomas aus Bielefeld)**
+  - JSON-Dateien werden jetzt korrekt zwischen Geräten synchronisiert
+  - Funktioniert auch ohne aktiviertes Markdown
+  - Hybrid-Optimierung: Server-Timestamp (Primary) + E-Tag (Secondary) Checks
+  - E-Tag wird nach Upload gecached um Re-Download zu vermeiden
+
+### Performance Improvements
+- **⚡ JSON Sync Performance-Parität**
+  - JSON-Sync erreicht jetzt gleiche Performance wie Markdown (~2-3 Sekunden)
+  - Timestamp-basierte Skip-Logik für unveränderte Dateien (~500ms pro Datei gespart)
+  - E-Tag-Matching als Fallback für Dateien die seit letztem Sync modifiziert wurden
+  - **Beispiel:** 24 Dateien von 12-14s auf ~2.7s reduziert (keine Änderungen)
+
+- **⏭️ Skip unveränderte Dateien** (Haupt-Performance-Fix!)
+  - JSON-Dateien: Überspringt alle Notizen, die seit letztem Sync nicht geändert wurden
+  - Markdown-Dateien: Überspringt unveränderte MD-Dateien basierend auf Server-Timestamp
+  - **Spart ~500ms pro Datei** bei Nextcloud (~20 Dateien = 10 Sekunden gespart!)
+  - Von 21 Sekunden Sync-Zeit auf 2-3 Sekunden reduziert
+
+- **⚡ Session-Caching für WebDAV** 
+  - Sardine-Client wird pro Sync-Session wiederverwendet (~600ms gespart)
+  - WiFi-IP-Adresse wird gecacht statt bei jeder Anfrage neu ermittelt (~300ms gespart)
+  - `/notes/` Ordner-Existenz wird nur einmal pro Sync geprüft (~500ms gespart)
+  - **Gesamt: ~1.4 Sekunden zusätzlich gespart**
+
+- **📝 Content-basierte Markdown-Erkennung**
+  - Extern bearbeitete Markdown-Dateien werden auch erkannt wenn YAML-Timestamp nicht aktualisiert wurde
+  - Löst das Problem: Obsidian/Texteditor-Änderungen wurden nicht importiert
+  - Hybridansatz: Erst Timestamp-Check (schnell), dann Content-Vergleich (zuverlässig)
+
+### Added
+- **🔄 Sync-Status-Anzeige (UI)**
+  - Sichtbares Banner "Synchronisiere..." mit ProgressBar während Sync läuft
+  - Sync-Button und Pull-to-Refresh werden deaktiviert während Sync aktiv
+  - Verhindert versehentliche Doppel-Syncs durch visuelle Rückmeldung
+  - Auch in Einstellungen: "Jetzt synchronisieren" Button wird deaktiviert
+
+### Fixed
+- **🔧 Sync-Mutex verhindert doppelte Syncs**
+  - Keine doppelten Toast-Nachrichten mehr bei schnellem Pull-to-Refresh
+  - Concurrent Sync-Requests werden korrekt blockiert
+
+- **🐛 Lint-Fehler behoben**
+  - `View.generateViewId()` statt hardcodierte IDs in RadioButtons
+  - `app:tint` statt `android:tint` für AppCompat-Kompatibilität
+
+### Added
+- **🔍 detekt Code-Analyse**
+  - Statische Code-Analyse mit detekt 1.23.4 integriert
+  - Pragmatische Konfiguration für Sync-intensive Codebasis
+  - 91 Issues identifiziert (als Baseline für v1.4.0)
+
+- **🏗️ Debug Build mit separatem Package**
+  - Debug-APK kann parallel zur Release-Version installiert werden
+  - Package: `dev.dettmer.simplenotes.debug` (Debug) vs `dev.dettmer.simplenotes` (Release)
+  - App-Name zeigt "Simple Notes (Debug)" für einfache Unterscheidung
+
+- **📊 Debug-Logging UI**
+  - Neuer "Debug Log" Button in Einstellungen → Erweitert
+  - Zeigt letzte Sync-Logs mit Zeitstempeln
+  - Export-Funktion für Fehlerberichte
+
+### Technical
+- `WebDavSyncService`: Hybrid-Optimierung für JSON-Downloads (Timestamp PRIMARY, E-Tag SECONDARY)
+- `WebDavSyncService`: E-Tag refresh nach Upload statt Invalidierung (verhindert Re-Download)
+- E-Tag Caching: `SharedPreferences` mit Key-Pattern `etag_json_{noteId}`
+- Skip-Logik: `if (serverModified <= lastSync) skip` → ~1ms pro Datei
+- Fallback E-Tag: `if (serverETag == cachedETag) skip` → für Dateien modifiziert nach lastSync
+- PROPFIND nach PUT: Fetch E-Tag nach Upload für korrektes Caching
+- `SyncStateManager`: Neuer Singleton mit `StateFlow<Boolean>` für Sync-Status
+- `MainActivity`: Observer auf `SyncStateManager.isSyncing` für UI-Updates
+- Layout: `sync_status_banner` mit `ProgressBar` + `TextView`
+- `WebDavSyncService`: Skip-Logik für unveränderte JSON/MD Dateien basierend auf `lastSyncTimestamp`
+- `WebDavSyncService`: Neue Session-Cache-Variablen (`sessionSardine`, `sessionWifiAddress`, `notesDirEnsured`)
+- `getOrCreateSardine()`: Cached Sardine-Client mit automatischer Credentials-Konfiguration
+- `getOrCacheWiFiAddress()`: WiFi-Adresse wird nur einmal pro Sync ermittelt
+- `clearSessionCache()`: Aufräumen am Ende jeder Sync-Session
+- `ensureNotesDirectoryExists()`: Cached Directory-Check
+- Content-basierter Import: Vergleicht MD-Content mit lokaler Note wenn Timestamps gleich
+- Build-Tooling: detekt aktiviert, ktlint vorbereitet (deaktiviert wegen Parser-Problemen)
+- Debug BuildType: `applicationIdSuffix = ".debug"`, `versionNameSuffix = "-debug"`
+
+---
+
+## [1.3.0] - 2026-01-07
+
+### Added
+- **🚀 Multi-Device Sync** (Thanks to Thomas from Bielefeld for reporting!)
+  - Automatic download of new notes from other devices
+  - Deletion tracking prevents "zombie notes" (deleted notes don't come back)
+  - Smart cleanup: Re-created notes (newer timestamp) are downloaded
+  - Works with all devices: v1.2.0, v1.2.1, v1.2.2, and v1.3.0
+
+- **🗑️ Server Deletion via Swipe Gesture**
+  - Swipe left on notes to delete from server (requires confirmation)
+  - Prevents duplicate notes on other devices
+  - Works with deletion tracking system
+  - Material Design confirmation dialog
+
+- **⚡ E-Tag Performance Optimization**
+  - Smart server checking with E-Tag caching (~150ms vs 3000ms for "no changes")
+  - 20x faster when server has no updates
+  - E-Tag hybrid approach: E-Tag for JSON (fast), timestamp for Markdown (reliable)
+  - Battery-friendly with minimal server requests
+
+- **📥 Markdown Auto-Sync Toggle**
+  - NEW: Unified Auto-Sync toggle in Settings (replaces separate Export/Auto-Import toggles)
+  - When enabled: Notes export to Markdown AND import changes automatically
+  - When disabled: Manual sync button appears for on-demand synchronization
+  - Performance: Auto-Sync OFF = 0ms overhead
+
+- **🔘 Manual Markdown Sync Button**
+  - Manual sync button for performance-conscious users
+  - Shows import/export counts after completion
+  - Only visible when Auto-Sync is disabled
+  - On-demand synchronization (~150-200ms only when triggered)
+
+- **⚙️ Server-Restore Modes**
+  - MERGE: Keep local notes + add server notes
+  - REPLACE: Delete all local + download from server
+  - OVERWRITE: Update duplicates, keep non-duplicates
+  - Restore modes now work correctly for WebDAV restore
+
+### Technical
+- New `DeletionTracker` model with JSON persistence
+- `NotesStorage`: Added deletion tracking methods
+- `WebDavSyncService.hasUnsyncedChanges()`: Intelligent server checks with E-Tag caching
+- `WebDavSyncService.downloadRemoteNotes()`: Deletion-aware downloads
+- `WebDavSyncService.restoreFromServer()`: Support for restore modes
+- `WebDavSyncService.deleteNoteFromServer()`: Server deletion with YAML frontmatter scanning
+- `WebDavSyncService.importMarkdownFiles()`: Automatic Markdown import during sync
+- `WebDavSyncService.manualMarkdownSync()`: Manual sync with result counts
+- `MainActivity.setupSwipeToDelete()`: Two-stage swipe deletion with confirmation
+- E-Tag caching in SharedPreferences for performance
+
+---
+
+## [1.2.2] - 2026-01-06
+
+### Fixed
+- **Backward Compatibility for v1.2.0 Users (Critical)**
+  - App now reads BOTH old (Root) AND new (`/notes/`) folder structures
+  - Users upgrading from v1.2.0 no longer lose their existing notes
+  - Server-Restore now finds notes from v1.2.0 stored in Root folder
+  - Automatic deduplication prevents loading the same note twice
+  - Graceful error handling if Root folder is not accessible
+
+### Technical
+- `WebDavSyncService.downloadRemoteNotes()` - Dual-mode download (Root + /notes/)
+- `WebDavSyncService.restoreFromServer()` - Now uses dual-mode download
+- Migration happens naturally: new uploads go to `/notes/`, old notes stay readable
+
+---
+
+## [1.2.1] - 2026-01-05
+
+### Fixed
+- **Markdown Initial Export Bugfix**
+  - Existing notes are now exported as Markdown when Desktop Integration is activated
+  - Previously, only new notes created after activation were exported
+  - Progress dialog shows export status with current/total counter
+  - Error handling for network issues during export
+  - Individual note failures don't abort the entire export
+
+- **Markdown Directory Structure Fix**
+  - Markdown files now correctly land in `/notes-md/` folder
+  - Smart URL detection supports both Root-URL and `/notes` URL structures
+  - Previously, MD files were incorrectly placed in the root directory
+  - Markdown import now finds files correctly
+
+- **JSON URL Normalization**
+  - Simplified server configuration: enter only base URL (e.g., `http://server:8080/`)
+  - App automatically creates `/notes/` for JSON files and `/notes-md/` for Markdown
+  - Smart detection: both `http://server:8080/` and `http://server:8080/notes/` work correctly
+  - Backward compatible: existing setups with `/notes` in URL continue to work
+  - No migration required for existing users
+
+### Changed
+- **Markdown Directory Creation**
+  - `notes-md/` folder is now created on first sync (regardless of Desktop Integration setting)
+  - Prevents 404 errors when mounting WebDAV folder
+  - Better user experience: folder is visible before enabling the feature
+
+- **Settings UI Improvements**
+  - Updated example URL from `/webdav` to `/notes` to match app behavior
+  - Example now shows: `http://192.168.0.188:8080/notes`
+
+### Technical
+- `WebDavSyncService.ensureMarkdownDirectoryExists()` - Creates MD folder early
+- `WebDavSyncService.getMarkdownUrl()` - Smart URL detection for both structures
+- `WebDavSyncService.exportAllNotesToMarkdown()` - Exports all local notes with progress callback
+- `SettingsActivity.onMarkdownExportToggled()` - Triggers initial export with ProgressDialog
+
+---
+
+## [1.2.0] - 2026-01-04
+
+### Added
+- **Local Backup System**
+  - Export all notes as JSON file to any location (Downloads, SD card, cloud folder)
+  - Import backup with 3 modes: Merge, Replace, or Overwrite duplicates
+  - Automatic safety backup created before every restore
+  - Backup validation (format and version check)
+  
+- **Markdown Desktop Integration**
+  - Optional Markdown export parallel to JSON sync
+  - `.md` files synced to `notes-md/` folder on WebDAV
+  - YAML frontmatter with `id`, `created`, `updated`, `device`
+  - Manual import button to pull Markdown changes from server
+  - Last-Write-Wins conflict resolution via timestamps
+  
+- **Settings UI Extensions**
+  - New "Backup & Restore" section with local + server restore
+  - New "Desktop Integration" section with Markdown toggle
+  - Universal restore dialog with radio button mode selection
+
+### Changed
+- **Server Restore Behavior**: Users now choose restore mode (Merge/Replace/Overwrite) instead of hard-coded replace-all
+
+### Technical
+- `BackupManager.kt` - Complete backup/restore logic
+- `Note.toMarkdown()` / `Note.fromMarkdown()` - Markdown conversion with YAML frontmatter
+- `WebDavSyncService` - Extended for dual-format sync (JSON master + Markdown mirror)
+- ISO8601 timestamp formatting for desktop compatibility
+- Filename sanitization for safe Markdown file names
+
+### Documentation
+- Added WebDAV mount instructions (Windows, macOS, Linux)
+- Created [SYNC_ARCHITECTURE.md](../project-docs/simple-notes-sync/architecture/SYNC_ARCHITECTURE.md) - Complete sync documentation
+- Created [MARKDOWN_DESKTOP_REALITY_CHECK.md](../project-docs/simple-notes-sync/markdown-desktop-plan/MARKDOWN_DESKTOP_REALITY_CHECK.md) - Desktop integration analysis
+
+---
+
+## [1.1.2] - 2025-12-28
+
+### Fixed
+- **"Job was cancelled" Error**
+  - Fixed coroutine cancellation in sync worker
+  - Proper error handling for interrupted syncs
+  
+- **UI Improvements**
+  - Back arrow instead of X in note editor (better UX)
+  - Pull-to-refresh for manual sync trigger
+  - HTTP/HTTPS protocol selection with radio buttons
+  - Inline error display (no toast spam)
+  
+- **Performance & Battery**
+  - Sync only on actual changes (saves battery)
+  - Auto-save notifications removed
+  - 24-hour server offline warning instead of instant error
+  
+### Changed
+- Settings grouped into "Auto-Sync" and "Sync Interval" sections
+- HTTP only allowed for local networks (RFC 1918 IPs)
+- Swipe-to-delete without UI flicker
+
+---
+
+## [1.1.1] - 2025-12-27
+
+### Fixed
+- **WiFi Connect Sync**
+  - No error notifications in foreign WiFi networks
+  - Server reachability check before sync (2s timeout)
+  - Silent abort when server offline
+  - Pre-check waits until network is ready
+  - No errors during network initialization
+  
+### Changed
+- **Notifications**
+  - Old sync notifications cleared on app start
+  - Error notifications auto-dismiss after 30 seconds
+  
+### UI
+- Sync icon only shown when sync is configured
+- Swipe-to-delete without flicker
+- Scroll to top after saving note
+
+### Technical
+- Server check with 2-second timeout before sync attempts
+- Network readiness check in WiFi connect trigger
+- Notification cleanup on MainActivity.onCreate()
+
+---
+
+## [1.1.0] - 2025-12-26
+
+### Added
+- **Configurable Sync Intervals**
+  - User choice: 15, 30, or 60 minutes
+  - Real-world battery impact displayed (15min: ~0.8%/day, 30min: ~0.4%/day, 60min: ~0.2%/day)
+  - Radio button selection in settings
+  - Doze Mode optimization (syncs batched in maintenance windows)
+  
+- **About Section**
+  - App version from BuildConfig
+  - Links to GitHub repository and developer profile
+  - MIT license information
+  - Material 3 card design
+
+### Changed
+- Settings UI redesigned with grouped sections
+- Periodic sync updated dynamically when interval changes
+- WorkManager uses selected interval for background sync
+
+### Removed
+- Debug/Logs section from settings (cleaner UI)
+
+### Technical
+- `PREF_SYNC_INTERVAL_MINUTES` preference key
+- NetworkMonitor reads interval from SharedPreferences
+- `ExistingPeriodicWorkPolicy.UPDATE` for live interval changes
+
+---
+
+## [1.0.0] - 2025-12-25
+
+### Added
+- Initial release
+- WebDAV synchronization
+- Note creation, editing, deletion
+- 6 sync triggers:
+  - Periodic sync (configurable interval)
+  - App start sync
+  - WiFi connect sync
+  - Manual sync (menu button)
+  - Pull-to-refresh
+  - Settings "Sync Now" button
+- Material 3 design
+- Light/Dark theme support
+- F-Droid compatible (100% FOSS)
+
+---
+
+[1.2.0]: https://github.com/inventory69/simple-notes-sync/releases/tag/v1.2.0
+[1.1.2]: https://github.com/inventory69/simple-notes-sync/releases/tag/v1.1.2
+[1.1.1]: https://github.com/inventory69/simple-notes-sync/releases/tag/v1.1.1
+[1.1.0]: https://github.com/inventory69/simple-notes-sync/releases/tag/v1.1.0
+[1.0.0]: https://github.com/inventory69/simple-notes-sync/releases/tag/v1.0.0

CHANGELOG.md

@@ -0,0 +1,681 @@
+# Changelog
+
+All notable changes to Simple Notes Sync will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+**🌍 Languages:** [Deutsch](CHANGELOG.de.md) · **English**
+
+---
+
+## [1.7.1] - 2026-02-02
+
+### 🐛 Critical Bug Fixes
+
+#### Android 9 App Crash Fix ([#15](https://github.com/inventory69/simple-notes-sync/issues/15))
+
+**Problem:** App crashed on Android 9 (API 28) when using WorkManager Expedited Work for background sync.
+
+**Root Cause:** When `setExpedited()` is used in WorkManager, the `CoroutineWorker` must implement `getForegroundInfo()` to return a Foreground Service notification. On Android 9-11, WorkManager calls this method, but the default implementation throws `IllegalStateException: Not implemented`.
+
+**Solution:** Implemented `getForegroundInfo()` in `SyncWorker` to return a proper `ForegroundInfo` with sync progress notification.
+
+**Details:**
+- Added `ForegroundInfo` with sync progress notification for Android 9-11
+- Android 10+: Sets `FOREGROUND_SERVICE_TYPE_DATA_SYNC` for proper service typing
+- Added Foreground Service permissions to AndroidManifest.xml
+- Notification shows sync progress with indeterminate progress bar
+- Thanks to [@roughnecks](https://github.com/roughnecks) for the detailed debugging!
+
+#### VPN Compatibility Fix ([#11](https://github.com/inventory69/simple-notes-sync/issues/11))
+
+- WiFi socket binding now correctly detects Wireguard VPN interfaces (tun*, wg*, *-wg-*)
+- Traffic routes through VPN tunnel instead of bypassing it directly to WiFi
+- Fixes "Connection timeout" when syncing to external servers via VPN
+
+### 🔧 Technical Changes
+
+- New `SafeSardineWrapper` class ensures proper HTTP connection cleanup
+- Reduced unnecessary 401 authentication challenges with preemptive auth headers
+- Added ProGuard rule to suppress harmless TextInclusionStrategy warnings on older Android versions
+- VPN interface detection via `NetworkInterface.getNetworkInterfaces()` pattern matching
+- Foreground Service detection and notification system for background sync tasks
+
+### 🌍 Localization
+
+- Fixed hardcoded German error messages - now uses string resources for proper localization
+- Added German and English strings for sync progress notifications
+
+---
+
+## [1.7.0] - 2026-01-26
+
+### 🎉 Major: Grid View, WiFi-Only Sync & VPN Support
+
+Pinterest-style grid, WiFi-only sync mode, and proper VPN support!
+
+### 🎨 Grid Layout
+
+- Pinterest-style staggered grid without gaps
+- Consistent 12dp spacing between cards
+- Scroll position preserved when returning from settings
+- New unified `NoteCardGrid` with dynamic preview lines (3 small, 6 large)
+
+### 📡 Sync Improvements
+
+- **WiFi-only sync toggle** - Sync only when connected to WiFi
+- **VPN support** - Sync works correctly when VPN is active (traffic routes through VPN)
+- **Server change detection** - All notes reset to PENDING when server URL changes
+- **Faster server check** - Socket timeout reduced from 2s to 1s
+- **"Sync already running" feedback** - Shows snackbar when sync is in progress
+
+### 🔒 Self-Signed SSL Support
+
+- **Documentation added** - Guide for using self-signed certificates
+- Uses Android's built-in CA trust store
+- Works with ownCloud, Nextcloud, Synology, home servers
+
+### 🔧 Technical
+
+- `NoteCardGrid` component with dynamic maxLines
+- Removed FullLine spans for gapless layout
+- `resetAllSyncStatusToPending()` in NotesStorage
+- VPN detection in `getOrCacheWiFiAddress()`
+
+---
+
+## [1.6.1] - 2026-01-20
+
+### 🧹 Code Quality & Build Improvements
+
+- **detekt: 0 issues** - All 29 code quality issues resolved
+  - Trivial fixes: Unused imports, MaxLineLength
+  - File rename: DragDropState.kt → DragDropListState.kt
+  - MagicNumbers → Constants (Dimensions.kt, SyncConstants.kt)
+  - SwallowedException: Logger.w() added for better error tracking
+  - LongParameterList: ChecklistEditorCallbacks data class created
+  - LongMethod: ServerSettingsScreen split into components
+  - @Suppress annotations for legacy code (WebDavSyncService, SettingsActivity)
+
+- **Zero build warnings** - All 21 deprecation warnings eliminated
+  - File-level @Suppress for deprecated imports
+  - ProgressDialog, LocalBroadcastManager, AbstractSavedStateViewModelFactory
+  - onActivityResult, onRequestPermissionsResult
+  - Gradle Compose config cleaned up (StrongSkipping is now default)
+
+- **ktlint reactivated** - Linting re-enabled with Compose-specific rules
+  - .editorconfig created with Compose formatting rules
+  - Legacy files excluded: WebDavSyncService.kt, build.gradle.kts
+  - ignoreFailures=true for gradual migration
+
+- **CI/CD improvements** - GitHub Actions lint checks integrated
+  - detekt + ktlint + Android Lint run before build in pr-build-check.yml
+  - Ensures code quality on every pull request
+
+### 🔧 Technical Improvements
+
+- **Constants refactoring** - Better code organization
+  - ui/theme/Dimensions.kt: UI-related constants
+  - utils/SyncConstants.kt: Sync operation constants
+
+- **Preparation for v2.0.0** - Legacy code marked for removal
+  - SettingsActivity and MainActivity (replaced by Compose versions)
+  - All deprecated APIs documented with removal plan
+
+---
+
+## [1.6.0] - 2026-01-19
+
+### 🎉 Major: Configurable Sync Triggers
+
+Fine-grained control over when your notes sync - choose which triggers fit your workflow best!
+
+### ⚙️ Sync Trigger System
+
+- **Individual trigger control** - Enable/disable each sync trigger separately in settings
+- **5 Independent Triggers:**
+  - **onSave Sync** - Sync immediately after saving a note (5s throttle)
+  - **onResume Sync** - Sync when app is opened (60s throttle)
+  - **WiFi-Connect Sync** - Sync when WiFi is connected
+  - **Periodic Sync** - Background sync every 15/30/60 minutes (configurable)
+  - **Boot Sync** - Start background sync after device restart
+
+- **Smart Defaults** - Only event-driven triggers active by default (onSave, onResume, WiFi-Connect)
+- **Battery Optimized** - ~0.2%/day with defaults, up to ~1.0% with periodic sync enabled
+- **Offline Mode UI** - Grayed-out sync toggles when no server configured
+- **Dynamic Settings Subtitle** - Shows count of active triggers on main settings screen
+
+### 🔧 Server Configuration Improvements
+
+- **Offline Mode Toggle** - Disable all network features with one switch
+- **Split Protocol & Host** - Protocol (http/https) shown as non-editable prefix
+- **Clickable Settings Cards** - Full card clickable for better UX
+- **Clickable Toggle Rows** - Click text/icon to toggle switches (not just the switch itself)
+
+### 🐛 Bug Fixes
+
+- **Fixed:** Missing 5th sync trigger (Boot) in main settings screen subtitle count
+- **Various fixes** - UI improvements and stability enhancements
+
+### 🔧 Technical Improvements
+
+- **Reactive offline mode state** - StateFlow ensures UI updates correctly
+- **Separated server config checks** - `hasServerConfig()` vs `isServerConfigured()` (offline-aware)
+- **Improved constants** - All sync trigger keys and defaults in Constants.kt
+- **Better code organization** - Settings screens refactored for clarity
+
+### Looking Ahead
+
+> 🚀 **v1.7.0** will bring server folder checking and additional community features.
+> Feature requests welcome as [GitHub Issue](https://github.com/inventory69/simple-notes-sync/issues).
+
+---
+
+## [1.5.0] - 2026-01-15
+
+### 🎉 Major: Jetpack Compose UI Redesign
+
+The complete UI has been migrated from XML Views to Jetpack Compose. The app is now more modern, faster, and smoother.
+
+### 🌍 New Feature: Internationalization (i18n)
+
+- **English language support** - All 400+ strings translated
+- **Automatic language detection** - Follows system language
+- **Manual language selection** - Switchable in settings
+- **Per-App Language (Android 13+)** - Native language setting via system settings
+- **locales_config.xml** - Complete Android integration
+
+### ⚙️ Modernized Settings
+
+- **7 categorized settings screens** - Clearer and more intuitive
+- **Compose Navigation** - Smooth transitions between screens
+- **Consistent design** - Material Design 3 throughout
+
+### ✨ UI Improvements
+
+- **Selection Mode** - Long-press for multi-select instead of swipe-to-delete
+- **Batch Delete** - Delete multiple notes at once
+- **Silent-Sync Mode** - No banner during auto-sync (only for manual sync)
+- **App Icon in About Screen** - High-quality display
+- **App Icon in Empty State** - Instead of emoji when note list is empty
+- **Splash Screen Update** - Uses app foreground icon
+- **Slide Animations** - Smooth animations in NoteEditor
+
+### 🔧 Technical Improvements
+
+- **Jetpack Compose** - Complete UI migration
+- **Compose ViewModel Integration** - StateFlow for reactive UI
+- **Improved Code Quality** - Detekt/Lint warnings fixed
+- **Unused Imports Cleanup** - Cleaner codebase
+
+### Looking Ahead
+
+> 🚀 **v1.6.0** will bring server folder checking and further technical modernizations.
+> Feature requests welcome as [GitHub Issue](https://github.com/inventory69/simple-notes-sync/issues).
+
+---
+
+## [1.4.1] - 2026-01-11
+
+### Fixed
+
+- **🗑️ Deleting older notes (v1.2.0 compatibility)**
+  - Notes from app version v1.2.0 or earlier are now correctly deleted from the server
+  - Fixes issue with multi-device usage with older notes
+
+- **🔄 Checklist sync backward compatibility**
+  - Checklists now also saved as text fallback in the `content` field
+  - Older app versions (v1.3.x) display checklists as readable text
+  - Format: GitHub-style task lists (`[ ] Item` / `[x] Item`)
+  - Recovery mode: If checklist items are lost, they are recovered from content
+
+### Improved
+
+- **📝 Checklist auto line-wrap**
+  - Long checklist texts now automatically wrap
+  - No more limit to 3 lines
+  - Enter key still creates a new item
+
+### Looking Ahead
+
+> 🚀 **v1.5.0** will be the next major release. We're collecting ideas and feedback!
+> Feature requests welcome as [GitHub Issue](https://github.com/inventory69/simple-notes-sync/issues).
+
+---
+
+## [1.4.0] - 2026-01-10
+
+### 🎉 New Feature: Checklists
+
+- **✅ Checklist Notes**
+  - New note type: Checklists with tap-to-toggle items
+  - Add items via dedicated input field with "+" button
+  - Drag & drop reordering (long-press to activate)
+  - Swipe-to-delete items
+  - Visual distinction: Checked items get strikethrough styling
+  - Type selector when creating new notes (Text or Checklist)
+
+- **📝 Markdown Integration**
+  - Checklists export as GitHub-style task lists (`- [ ]` / `- [x]`)
+  - Compatible with Obsidian, Notion, and other Markdown editors
+  - Full round-trip: Edit in Obsidian → Sync back to app
+  - YAML frontmatter includes `type: checklist` for identification
+
+### Fixed
+
+- **<2A> Markdown Parsing Robustness**
+  - Fixed content extraction after title (was returning empty for some formats)
+  - Now handles single newline after title (was requiring double newline)
+  - Protection: Skips import if parsed content is empty but local has content
+
+- **📂 Duplicate Filename Handling**
+  - Notes with identical titles now get unique Markdown filenames
+  - Format: `title_shortid.md` (e.g., `test_71540ca9.md`)
+  - Prevents data loss from filename collisions
+
+- **🔔 Notification UX**
+  - No sync notifications when app is in foreground
+  - User sees changes directly in UI - no redundant notification
+  - Background syncs still show notifications as expected
+
+### Privacy Improvements
+
+- **🔒 WiFi Permissions Removed**
+  - Removed `ACCESS_WIFI_STATE` permission
+  - Removed `CHANGE_WIFI_STATE` permission
+  - WiFi binding now works via IP detection instead of SSID matching
+  - Cleaned up all SSID-related code from codebase and documentation
+
+### Technical Improvements
+
+- **📦 New Data Model**
+  - `NoteType` enum: `TEXT`, `CHECKLIST`
+  - `ChecklistItem` data class with id, text, isChecked, order
+  - `Note.kt` extended with `noteType` and `checklistItems` fields
+
+- **🔄 Sync Protocol v1.4.0**
+  - JSON format updated to include checklist fields
+  - Full backward compatibility with v1.3.x notes
+  - Robust JSON parsing with manual field extraction
+
+---
+
+## [1.3.2] - 2026-01-10
+
+### Changed
+- **🧹 Code-Qualität: "Clean Slate" Release**
+  - Alle einfachen Lint-Issues behoben (Phase 1-7 des Cleanup-Plans)
+  - Unused Imports und Members entfernt
+  - Magic Numbers durch benannte Konstanten ersetzt
+  - SwallowedExceptions mit Logger.w() versehen
+  - MaxLineLength-Verstöße reformatiert
+  - ConstructorParameterNaming (snake_case → camelCase mit @SerializedName)
+  - Custom Exceptions: SyncException.kt und ValidationException.kt erstellt
+
+### Added  
+- **📝 F-Droid Privacy Notice**
+  - Datenschutz-Hinweis für die Datei-Logging-Funktion
+  - Erklärt dass Logs nur lokal gespeichert werden
+  - Erfüllt F-Droid Opt-in Consent-Anforderungen
+
+### Technical Improvements
+- **⚡ Neue Konstanten für bessere Wartbarkeit**
+  - `SYNC_COMPLETED_DELAY_MS`, `ERROR_DISPLAY_DELAY_MS` (MainActivity)
+  - `CONNECTION_TIMEOUT_MS` (SettingsActivity)
+  - `SOCKET_TIMEOUT_MS`, `MAX_FILENAME_LENGTH`, `ETAG_PREVIEW_LENGTH` (WebDavSyncService)
+  - `AUTO_CANCEL_TIMEOUT_MS` (NotificationHelper)
+  - RFC 1918 IP-Range Konstanten (UrlValidator)
+  - `DAYS_THRESHOLD`, `TRUNCATE_SUFFIX_LENGTH` (Extensions)
+
+- **🔒 @Suppress Annotations für legitime Patterns**
+  - ReturnCount: Frühe Returns für Validierung sind idiomatisch
+  - LoopWithTooManyJumpStatements: Komplexe Sync-Logik dokumentiert
+
+### Notes
+- Komplexe Refactorings (LargeClass, LongMethod) für v1.3.3+ geplant
+- Deprecation-Warnungen (LocalBroadcastManager, ProgressDialog) bleiben bestehen
+
+---
+
+## [1.3.1] - 2026-01-08
+
+### Fixed
+- **🔧 Multi-Device JSON Sync (Danke an Thomas aus Bielefeld)**
+  - JSON-Dateien werden jetzt korrekt zwischen Geräten synchronisiert
+  - Funktioniert auch ohne aktiviertes Markdown
+  - Hybrid-Optimierung: Server-Timestamp (Primary) + E-Tag (Secondary) Checks
+  - E-Tag wird nach Upload gecached um Re-Download zu vermeiden
+
+### Performance Improvements
+- **⚡ JSON Sync Performance-Parität**
+  - JSON-Sync erreicht jetzt gleiche Performance wie Markdown (~2-3 Sekunden)
+  - Timestamp-basierte Skip-Logik für unveränderte Dateien (~500ms pro Datei gespart)
+  - E-Tag-Matching als Fallback für Dateien die seit letztem Sync modifiziert wurden
+  - **Beispiel:** 24 Dateien von 12-14s auf ~2.7s reduziert (keine Änderungen)
+
+- **⏭️ Skip unveränderte Dateien** (Haupt-Performance-Fix!)
+  - JSON-Dateien: Überspringt alle Notizen, die seit letztem Sync nicht geändert wurden
+  - Markdown-Dateien: Überspringt unveränderte MD-Dateien basierend auf Server-Timestamp
+  - **Spart ~500ms pro Datei** bei Nextcloud (~20 Dateien = 10 Sekunden gespart!)
+  - Von 21 Sekunden Sync-Zeit auf 2-3 Sekunden reduziert
+
+- **⚡ Session-Caching für WebDAV** 
+  - Sardine-Client wird pro Sync-Session wiederverwendet (~600ms gespart)
+  - WiFi-IP-Adresse wird gecacht statt bei jeder Anfrage neu ermittelt (~300ms gespart)
+  - `/notes/` Ordner-Existenz wird nur einmal pro Sync geprüft (~500ms gespart)
+  - **Gesamt: ~1.4 Sekunden zusätzlich gespart**
+
+- **📝 Content-basierte Markdown-Erkennung**
+  - Extern bearbeitete Markdown-Dateien werden auch erkannt wenn YAML-Timestamp nicht aktualisiert wurde
+  - Löst das Problem: Obsidian/Texteditor-Änderungen wurden nicht importiert
+  - Hybridansatz: Erst Timestamp-Check (schnell), dann Content-Vergleich (zuverlässig)
+
+### Added
+- **🔄 Sync-Status-Anzeige (UI)**
+  - Sichtbares Banner "Synchronisiere..." mit ProgressBar während Sync läuft
+  - Sync-Button und Pull-to-Refresh werden deaktiviert während Sync aktiv
+  - Verhindert versehentliche Doppel-Syncs durch visuelle Rückmeldung
+  - Auch in Einstellungen: "Jetzt synchronisieren" Button wird deaktiviert
+
+### Fixed
+- **🔧 Sync-Mutex verhindert doppelte Syncs**
+  - Keine doppelten Toast-Nachrichten mehr bei schnellem Pull-to-Refresh
+  - Concurrent Sync-Requests werden korrekt blockiert
+
+- **🐛 Lint-Fehler behoben**
+  - `View.generateViewId()` statt hardcodierte IDs in RadioButtons
+  - `app:tint` statt `android:tint` für AppCompat-Kompatibilität
+
+### Added
+- **🔍 detekt Code-Analyse**
+  - Statische Code-Analyse mit detekt 1.23.4 integriert
+  - Pragmatische Konfiguration für Sync-intensive Codebasis
+  - 91 Issues identifiziert (als Baseline für v1.4.0)
+
+- **🏗️ Debug Build mit separatem Package**
+  - Debug-APK kann parallel zur Release-Version installiert werden
+  - Package: `dev.dettmer.simplenotes.debug` (Debug) vs `dev.dettmer.simplenotes` (Release)
+  - App-Name zeigt "Simple Notes (Debug)" für einfache Unterscheidung
+
+- **📊 Debug-Logging UI**
+  - Neuer "Debug Log" Button in Einstellungen → Erweitert
+  - Zeigt letzte Sync-Logs mit Zeitstempeln
+  - Export-Funktion für Fehlerberichte
+
+### Technical
+- `WebDavSyncService`: Hybrid-Optimierung für JSON-Downloads (Timestamp PRIMARY, E-Tag SECONDARY)
+- `WebDavSyncService`: E-Tag refresh nach Upload statt Invalidierung (verhindert Re-Download)
+- E-Tag Caching: `SharedPreferences` mit Key-Pattern `etag_json_{noteId}`
+- Skip-Logik: `if (serverModified <= lastSync) skip` → ~1ms pro Datei
+- Fallback E-Tag: `if (serverETag == cachedETag) skip` → für Dateien modifiziert nach lastSync
+- PROPFIND nach PUT: Fetch E-Tag nach Upload für korrektes Caching
+- `SyncStateManager`: Neuer Singleton mit `StateFlow<Boolean>` für Sync-Status
+- `MainActivity`: Observer auf `SyncStateManager.isSyncing` für UI-Updates
+- Layout: `sync_status_banner` mit `ProgressBar` + `TextView`
+- `WebDavSyncService`: Skip-Logik für unveränderte JSON/MD Dateien basierend auf `lastSyncTimestamp`
+- `WebDavSyncService`: Neue Session-Cache-Variablen (`sessionSardine`, `sessionWifiAddress`, `notesDirEnsured`)
+- `getOrCreateSardine()`: Cached Sardine-Client mit automatischer Credentials-Konfiguration
+- `getOrCacheWiFiAddress()`: WiFi-Adresse wird nur einmal pro Sync ermittelt
+- `clearSessionCache()`: Aufräumen am Ende jeder Sync-Session
+- `ensureNotesDirectoryExists()`: Cached Directory-Check
+- Content-basierter Import: Vergleicht MD-Content mit lokaler Note wenn Timestamps gleich
+- Build-Tooling: detekt aktiviert, ktlint vorbereitet (deaktiviert wegen Parser-Problemen)
+- Debug BuildType: `applicationIdSuffix = ".debug"`, `versionNameSuffix = "-debug"`
+
+---
+
+## [1.3.0] - 2026-01-07
+
+### Added
+- **🚀 Multi-Device Sync** (Thanks to Thomas from Bielefeld for reporting!)
+  - Automatic download of new notes from other devices
+  - Deletion tracking prevents "zombie notes" (deleted notes don't come back)
+  - Smart cleanup: Re-created notes (newer timestamp) are downloaded
+  - Works with all devices: v1.2.0, v1.2.1, v1.2.2, and v1.3.0
+
+- **🗑️ Server Deletion via Swipe Gesture**
+  - Swipe left on notes to delete from server (requires confirmation)
+  - Prevents duplicate notes on other devices
+  - Works with deletion tracking system
+  - Material Design confirmation dialog
+
+- **⚡ E-Tag Performance Optimization**
+  - Smart server checking with E-Tag caching (~150ms vs 3000ms for "no changes")
+  - 20x faster when server has no updates
+  - E-Tag hybrid approach: E-Tag for JSON (fast), timestamp for Markdown (reliable)
+  - Battery-friendly with minimal server requests
+
+- **📥 Markdown Auto-Sync Toggle**
+  - NEW: Unified Auto-Sync toggle in Settings (replaces separate Export/Auto-Import toggles)
+  - When enabled: Notes export to Markdown AND import changes automatically
+  - When disabled: Manual sync button appears for on-demand synchronization
+  - Performance: Auto-Sync OFF = 0ms overhead
+
+- **🔘 Manual Markdown Sync Button**
+  - Manual sync button for performance-conscious users
+  - Shows import/export counts after completion
+  - Only visible when Auto-Sync is disabled
+  - On-demand synchronization (~150-200ms only when triggered)
+
+- **⚙️ Server-Restore Modes**
+  - MERGE: Keep local notes + add server notes
+  - REPLACE: Delete all local + download from server
+  - OVERWRITE: Update duplicates, keep non-duplicates
+  - Restore modes now work correctly for WebDAV restore
+
+### Technical
+- New `DeletionTracker` model with JSON persistence
+- `NotesStorage`: Added deletion tracking methods
+- `WebDavSyncService.hasUnsyncedChanges()`: Intelligent server checks with E-Tag caching
+- `WebDavSyncService.downloadRemoteNotes()`: Deletion-aware downloads
+- `WebDavSyncService.restoreFromServer()`: Support for restore modes
+- `WebDavSyncService.deleteNoteFromServer()`: Server deletion with YAML frontmatter scanning
+- `WebDavSyncService.importMarkdownFiles()`: Automatic Markdown import during sync
+- `WebDavSyncService.manualMarkdownSync()`: Manual sync with result counts
+- `MainActivity.setupSwipeToDelete()`: Two-stage swipe deletion with confirmation
+- E-Tag caching in SharedPreferences for performance
+
+---
+
+## [1.2.2] - 2026-01-06
+
+### Fixed
+- **Backward Compatibility for v1.2.0 Users (Critical)**
+  - App now reads BOTH old (Root) AND new (`/notes/`) folder structures
+  - Users upgrading from v1.2.0 no longer lose their existing notes
+  - Server-Restore now finds notes from v1.2.0 stored in Root folder
+  - Automatic deduplication prevents loading the same note twice
+  - Graceful error handling if Root folder is not accessible
+
+### Technical
+- `WebDavSyncService.downloadRemoteNotes()` - Dual-mode download (Root + /notes/)
+- `WebDavSyncService.restoreFromServer()` - Now uses dual-mode download
+- Migration happens naturally: new uploads go to `/notes/`, old notes stay readable
+
+---
+
+## [1.2.1] - 2026-01-05
+
+### Fixed
+- **Markdown Initial Export Bugfix**
+  - Existing notes are now exported as Markdown when Desktop Integration is activated
+  - Previously, only new notes created after activation were exported
+  - Progress dialog shows export status with current/total counter
+  - Error handling for network issues during export
+  - Individual note failures don't abort the entire export
+
+- **Markdown Directory Structure Fix**
+  - Markdown files now correctly land in `/notes-md/` folder
+  - Smart URL detection supports both Root-URL and `/notes` URL structures
+  - Previously, MD files were incorrectly placed in the root directory
+  - Markdown import now finds files correctly
+
+- **JSON URL Normalization**
+  - Simplified server configuration: enter only base URL (e.g., `http://server:8080/`)
+  - App automatically creates `/notes/` for JSON files and `/notes-md/` for Markdown
+  - Smart detection: both `http://server:8080/` and `http://server:8080/notes/` work correctly
+  - Backward compatible: existing setups with `/notes` in URL continue to work
+  - No migration required for existing users
+
+### Changed
+- **Markdown Directory Creation**
+  - `notes-md/` folder is now created on first sync (regardless of Desktop Integration setting)
+  - Prevents 404 errors when mounting WebDAV folder
+  - Better user experience: folder is visible before enabling the feature
+
+- **Settings UI Improvements**
+  - Updated example URL from `/webdav` to `/notes` to match app behavior
+  - Example now shows: `http://192.168.0.188:8080/notes`
+
+### Technical
+- `WebDavSyncService.ensureMarkdownDirectoryExists()` - Creates MD folder early
+- `WebDavSyncService.getMarkdownUrl()` - Smart URL detection for both structures
+- `WebDavSyncService.exportAllNotesToMarkdown()` - Exports all local notes with progress callback
+- `SettingsActivity.onMarkdownExportToggled()` - Triggers initial export with ProgressDialog
+
+---
+
+## [1.2.0] - 2026-01-04
+
+### Added
+- **Local Backup System**
+  - Export all notes as JSON file to any location (Downloads, SD card, cloud folder)
+  - Import backup with 3 modes: Merge, Replace, or Overwrite duplicates
+  - Automatic safety backup created before every restore
+  - Backup validation (format and version check)
+  
+- **Markdown Desktop Integration**
+  - Optional Markdown export parallel to JSON sync
+  - `.md` files synced to `notes-md/` folder on WebDAV
+  - YAML frontmatter with `id`, `created`, `updated`, `device`
+  - Manual import button to pull Markdown changes from server
+  - Last-Write-Wins conflict resolution via timestamps
+  
+- **Settings UI Extensions**
+  - New "Backup & Restore" section with local + server restore
+  - New "Desktop Integration" section with Markdown toggle
+  - Universal restore dialog with radio button mode selection
+
+### Changed
+- **Server Restore Behavior**: Users now choose restore mode (Merge/Replace/Overwrite) instead of hard-coded replace-all
+
+### Technical
+- `BackupManager.kt` - Complete backup/restore logic
+- `Note.toMarkdown()` / `Note.fromMarkdown()` - Markdown conversion with YAML frontmatter
+- `WebDavSyncService` - Extended for dual-format sync (JSON master + Markdown mirror)
+- ISO8601 timestamp formatting for desktop compatibility
+- Filename sanitization for safe Markdown file names
+
+### Documentation
+- Added WebDAV mount instructions (Windows, macOS, Linux)
+- Created [SYNC_ARCHITECTURE.md](../project-docs/simple-notes-sync/architecture/SYNC_ARCHITECTURE.md) - Complete sync documentation
+- Created [MARKDOWN_DESKTOP_REALITY_CHECK.md](../project-docs/simple-notes-sync/markdown-desktop-plan/MARKDOWN_DESKTOP_REALITY_CHECK.md) - Desktop integration analysis
+
+---
+
+## [1.1.2] - 2025-12-28
+
+### Fixed
+- **"Job was cancelled" Error**
+  - Fixed coroutine cancellation in sync worker
+  - Proper error handling for interrupted syncs
+  
+- **UI Improvements**
+  - Back arrow instead of X in note editor (better UX)
+  - Pull-to-refresh for manual sync trigger
+  - HTTP/HTTPS protocol selection with radio buttons
+  - Inline error display (no toast spam)
+  
+- **Performance & Battery**
+  - Sync only on actual changes (saves battery)
+  - Auto-save notifications removed
+  - 24-hour server offline warning instead of instant error
+  
+### Changed
+- Settings grouped into "Auto-Sync" and "Sync Interval" sections
+- HTTP only allowed for local networks (RFC 1918 IPs)
+- Swipe-to-delete without UI flicker
+
+---
+
+## [1.1.1] - 2025-12-27
+
+### Fixed
+- **WiFi Connect Sync**
+  - No error notifications in foreign WiFi networks
+  - Server reachability check before sync (2s timeout)
+  - Silent abort when server offline
+  - Pre-check waits until network is ready
+  - No errors during network initialization
+  
+### Changed
+- **Notifications**
+  - Old sync notifications cleared on app start
+  - Error notifications auto-dismiss after 30 seconds
+  
+### UI
+- Sync icon only shown when sync is configured
+- Swipe-to-delete without flicker
+- Scroll to top after saving note
+
+### Technical
+- Server check with 2-second timeout before sync attempts
+- Network readiness check in WiFi connect trigger
+- Notification cleanup on MainActivity.onCreate()
+
+---
+
+## [1.1.0] - 2025-12-26
+
+### Added
+- **Configurable Sync Intervals**
+  - User choice: 15, 30, or 60 minutes
+  - Real-world battery impact displayed (15min: ~0.8%/day, 30min: ~0.4%/day, 60min: ~0.2%/day)
+  - Radio button selection in settings
+  - Doze Mode optimization (syncs batched in maintenance windows)
+  
+- **About Section**
+  - App version from BuildConfig
+  - Links to GitHub repository and developer profile
+  - MIT license information
+  - Material 3 card design
+
+### Changed
+- Settings UI redesigned with grouped sections
+- Periodic sync updated dynamically when interval changes
+- WorkManager uses selected interval for background sync
+
+### Removed
+- Debug/Logs section from settings (cleaner UI)
+
+### Technical
+- `PREF_SYNC_INTERVAL_MINUTES` preference key
+- NetworkMonitor reads interval from SharedPreferences
+- `ExistingPeriodicWorkPolicy.UPDATE` for live interval changes
+
+---
+
+## [1.0.0] - 2025-12-25
+
+### Added
+- Initial release
+- WebDAV synchronization
+- Note creation, editing, deletion
+- 6 sync triggers:
+  - Periodic sync (configurable interval)
+  - App start sync
+  - WiFi connect sync
+  - Manual sync (menu button)
+  - Pull-to-refresh
+  - Settings "Sync Now" button
+- Material 3 design
+- Light/Dark theme support
+- F-Droid compatible (100% FOSS)
+
+---
+
+[1.2.0]: https://github.com/inventory69/simple-notes-sync/releases/tag/v1.2.0
+[1.1.2]: https://github.com/inventory69/simple-notes-sync/releases/tag/v1.1.2
+[1.1.1]: https://github.com/inventory69/simple-notes-sync/releases/tag/v1.1.1
+[1.1.0]: https://github.com/inventory69/simple-notes-sync/releases/tag/v1.1.0
+[1.0.0]: https://github.com/inventory69/simple-notes-sync/releases/tag/v1.0.0

CONTRIBUTING.md

@@ -0,0 +1,263 @@
+# Contributing to Simple Notes Sync 🤝
+
+> Beiträge sind willkommen! / Contributions are welcome!
+
+**🌍 Languages:** [Deutsch](#deutsch) · [English](#english)
+
+---
+
+## Deutsch
+
+Danke, dass du zu Simple Notes Sync beitragen möchtest! 
+
+### 🚀 Schnellstart
+
+1. **Fork & Clone**
+   ```bash
+   git clone https://github.com/inventory69/simple-notes-sync.git
+   cd simple-notes-sync
+   ```
+
+2. **Branch erstellen**
+   ```bash
+   git checkout -b feature/mein-feature
+   # oder
+   git checkout -b fix/mein-bugfix
+   ```
+
+3. **Änderungen machen**
+   - Code schreiben
+   - Testen
+   - Committen mit aussagekräftiger Message
+
+4. **Pull Request erstellen**
+   - Push deinen Branch: `git push origin feature/mein-feature`
+   - Gehe zu GitHub und erstelle einen Pull Request
+   - Beschreibe deine Änderungen
+
+### 🧪 Automatische Tests
+
+Wenn du einen Pull Request erstellst, läuft automatisch ein **Build Check**:
+
+- ✅ Debug APKs werden gebaut (Standard + F-Droid)
+- ✅ Unit Tests werden ausgeführt
+- ✅ APKs werden als Artefakte hochgeladen (zum Testen)
+- ✅ Build-Status wird als Kommentar im PR gepostet
+
+**Wichtig:** Der Build muss erfolgreich sein (grüner Haken ✅) bevor der PR gemerged werden kann.
+
+### 📱 Android App Development
+
+**Build lokal testen:**
+```bash
+cd android
+
+# Debug Build
+./gradlew assembleStandardDebug
+
+# Tests ausführen
+./gradlew test
+
+# Lint Check
+./gradlew lint
+```
+
+**Anforderungen:**
+- Android SDK 36 (Target)
+- Android SDK 24 (Minimum)
+- JDK 17
+- Kotlin 1.9+
+
+### 📝 Code Style
+
+- **Kotlin:** Folge den [Kotlin Coding Conventions](https://kotlinlang.org/docs/coding-conventions.html)
+- **Formatierung:** Android Studio Default Formatter
+- **Kommentare:** Deutsch oder Englisch (bevorzugt Englisch für Code)
+
+### 🐛 Bug Reports
+
+Nutze die [Bug Report Template](https://github.com/inventory69/simple-notes-sync/issues/new/choose) mit:
+- Android Version
+- App Version
+- Schritte zum Reproduzieren
+- Erwartetes vs. tatsächliches Verhalten
+
+### 💡 Feature Requests
+
+Nutze die [Feature Request Template](https://github.com/inventory69/simple-notes-sync/issues/new/choose) und beschreibe:
+- Was soll hinzugefügt werden
+- Warum ist es nützlich
+- Wie könnte es funktionieren
+
+### 📚 Dokumentation
+
+Dokumentations-Verbesserungen sind auch Contributions! 
+
+**Dateien:**
+- `README.md` / `README.en.md` - Übersicht
+- `QUICKSTART.md` / `QUICKSTART.en.md` - Schritt-für-Schritt Anleitung
+- `DOCS.md` / `DOCS.en.md` - Technische Details
+- `server/README.md` / `server/README.en.md` - Server Setup
+
+**Bitte:** Halte beide Sprachen (DE/EN) synchron!
+
+### ✅ Pull Request Checklist
+
+- [ ] Code kompiliert lokal (`./gradlew assembleStandardDebug`)
+- [ ] Tests laufen durch (`./gradlew test`)
+- [ ] Keine neuen Lint-Warnungen
+- [ ] Commit-Messages sind aussagekräftig
+- [ ] Dokumentation aktualisiert (falls nötig)
+- [ ] Beide Sprachen aktualisiert (bei Doku-Änderungen)
+
+### 🎯 Was wird akzeptiert?
+
+**✅ Gerne:**
+- Bug Fixes
+- Performance-Verbesserungen
+- Neue Features (nach Diskussion in einem Issue)
+- Dokumentations-Verbesserungen
+- Tests
+- UI/UX Verbesserungen
+
+**❌ Schwierig:**
+- Breaking Changes (bitte erst als Issue diskutieren)
+- Komplett neue Architektur
+- Dependencies mit fragwürdigen Lizenzen
+
+### 📄 Lizenz
+
+Indem du contributest, stimmst du zu dass dein Code unter der [MIT License](LICENSE) veröffentlicht wird.
+
+---
+
+## English
+
+Thanks for wanting to contribute to Simple Notes Sync!
+
+### 🚀 Quick Start
+
+1. **Fork & Clone**
+   ```bash
+   git clone https://github.com/inventory69/simple-notes-sync.git
+   cd simple-notes-sync
+   ```
+
+2. **Create Branch**
+   ```bash
+   git checkout -b feature/my-feature
+   # or
+   git checkout -b fix/my-bugfix
+   ```
+
+3. **Make Changes**
+   - Write code
+   - Test
+   - Commit with meaningful message
+
+4. **Create Pull Request**
+   - Push your branch: `git push origin feature/my-feature`
+   - Go to GitHub and create a Pull Request
+   - Describe your changes
+
+### 🧪 Automated Tests
+
+When you create a Pull Request, an automatic **Build Check** runs:
+
+- ✅ Debug APKs are built (Standard + F-Droid)
+- ✅ Unit tests are executed
+- ✅ APKs are uploaded as artifacts (for testing)
+- ✅ Build status is posted as comment in PR
+
+**Important:** The build must succeed (green checkmark ✅) before the PR can be merged.
+
+### 📱 Android App Development
+
+**Test build locally:**
+```bash
+cd android
+
+# Debug Build
+./gradlew assembleStandardDebug
+
+# Run tests
+./gradlew test
+
+# Lint Check
+./gradlew lint
+```
+
+**Requirements:**
+- Android SDK 36 (Target)
+- Android SDK 24 (Minimum)
+- JDK 17
+- Kotlin 1.9+
+
+### 📝 Code Style
+
+- **Kotlin:** Follow [Kotlin Coding Conventions](https://kotlinlang.org/docs/coding-conventions.html)
+- **Formatting:** Android Studio Default Formatter
+- **Comments:** German or English (preferably English for code)
+
+### 🐛 Bug Reports
+
+Use the [Bug Report Template](https://github.com/inventory69/simple-notes-sync/issues/new/choose) with:
+- Android version
+- App version
+- Steps to reproduce
+- Expected vs. actual behavior
+
+### 💡 Feature Requests
+
+Use the [Feature Request Template](https://github.com/inventory69/simple-notes-sync/issues/new/choose) and describe:
+- What should be added
+- Why is it useful
+- How could it work
+
+### 📚 Documentation
+
+Documentation improvements are also contributions!
+
+**Files:**
+- `README.md` / `README.en.md` - Overview
+- `QUICKSTART.md` / `QUICKSTART.en.md` - Step-by-step guide
+- `DOCS.md` / `DOCS.en.md` - Technical details
+- `server/README.md` / `server/README.en.md` - Server setup
+
+**Please:** Keep both languages (DE/EN) in sync!
+
+### ✅ Pull Request Checklist
+
+- [ ] Code compiles locally (`./gradlew assembleStandardDebug`)
+- [ ] Tests pass (`./gradlew test`)
+- [ ] No new lint warnings
+- [ ] Commit messages are meaningful
+- [ ] Documentation updated (if needed)
+- [ ] Both languages updated (for doc changes)
+
+### 🎯 What Gets Accepted?
+
+**✅ Welcome:**
+- Bug fixes
+- Performance improvements
+- New features (after discussion in an issue)
+- Documentation improvements
+- Tests
+- UI/UX improvements
+
+**❌ Difficult:**
+- Breaking changes (please discuss in issue first)
+- Completely new architecture
+- Dependencies with questionable licenses
+
+### 📄 License
+
+By contributing, you agree that your code will be published under the [MIT License](LICENSE).
+
+---
+
+## 🆘 Fragen? / Questions?
+
+Öffne ein [Issue](https://github.com/inventory69/simple-notes-sync/issues) oder nutze die [Question Template](https://github.com/inventory69/simple-notes-sync/issues/new/choose).
+
+**Frohe Weihnachten & Happy Coding! 🎄**

GITHUB_ACTIONS_SETUP.md

@@ -1,188 +0,0 @@
-# GitHub Actions Setup Guide
-
-This guide explains how to set up the GitHub Actions workflow for automated APK builds with proper signing.
-
-## Overview
-
-The workflow in `.github/workflows/build-production-apk.yml` automatically:
-- Builds signed APKs on every push to `main`
-- Generates version numbers using `YYYY.MM.DD` + build number
-- Creates 3 APK variants (universal, arm64-v8a, armeabi-v7a)
-- Creates GitHub releases with all APKs attached
-
-## Prerequisites
-
-- GitHub CLI (`gh`) installed
-- Java 17+ installed (for keytool)
-- Git repository initialized with GitHub remote
-
-## Step 1: Generate Signing Keystore
-
-⚠️ **IMPORTANT**: Store the keystore securely! Without it, you cannot publish updates to your app.
-
-```bash
-# Navigate to project root
-cd /path/to/simple-notes-sync
-
-# Generate keystore (replace values as needed)
-keytool -genkey -v \
-  -keystore android/app/simple-notes-release.jks \
-  -keyalg RSA \
-  -keysize 2048 \
-  -validity 10000 \
-  -alias simple-notes
-
-# You will be prompted for:
-# - Keystore password (remember this!)
-# - Key password (remember this!)
-# - Your name, organization, etc.
-```
-
-**Store these securely:**
-- Keystore password
-- Key password
-- Alias: `simple-notes`
-- Keystore file: `android/app/simple-notes-release.jks`
-
-⚠️ **BACKUP**: Make a backup of the keystore file in a secure location (NOT in the repository).
-
-## Step 2: Base64 Encode Keystore
-
-```bash
-# Create base64 encoded version
-base64 android/app/simple-notes-release.jks > simple-notes-release.jks.b64
-
-# Or on macOS:
-base64 -i android/app/simple-notes-release.jks -o simple-notes-release.jks.b64
-```
-
-## Step 3: Set GitHub Secrets
-
-Using GitHub CLI (recommended):
-
-```bash
-# Set KEYSTORE_BASE64 secret
-gh secret set KEYSTORE_BASE64 < simple-notes-release.jks.b64
-
-# Set KEYSTORE_PASSWORD (will prompt for input)
-gh secret set KEYSTORE_PASSWORD
-
-# Set KEY_PASSWORD (will prompt for input)
-gh secret set KEY_PASSWORD
-
-# Set KEY_ALIAS (value: simple-notes)
-printf "simple-notes" | gh secret set KEY_ALIAS
-```
-
-Or manually via GitHub web interface:
-1. Go to repository Settings → Secrets and variables → Actions
-2. Click "New repository secret"
-3. Add these secrets:
-   - `KEYSTORE_BASE64`: Paste content of `simple-notes-release.jks.b64`
-   - `KEYSTORE_PASSWORD`: Your keystore password
-   - `KEY_PASSWORD`: Your key password
-   - `KEY_ALIAS`: `simple-notes`
-
-## Step 4: Verify Setup
-
-```bash
-# Check secrets are set
-gh secret list
-
-# Expected output:
-# KEYSTORE_BASE64  Updated YYYY-MM-DD
-# KEYSTORE_PASSWORD  Updated YYYY-MM-DD
-# KEY_PASSWORD  Updated YYYY-MM-DD
-# KEY_ALIAS  Updated YYYY-MM-DD
-```
-
-## Step 5: Cleanup
-
-```bash
-# Remove sensitive files (they're in .gitignore, but double-check)
-rm simple-notes-release.jks.b64
-rm -f android/key.properties  # Generated by workflow
-
-# Verify keystore is NOT tracked by git
-git status | grep -i jks
-# Should return nothing
-```
-
-## Step 6: Trigger First Build
-
-```bash
-# Commit and push to main
-git add .
-git commit -m "🚀 feat: Add GitHub Actions deployment workflow"
-git push origin main
-
-# Or manually trigger workflow
-gh workflow run build-production-apk.yml
-```
-
-## Verification
-
-1. Go to GitHub repository → Actions tab
-2. Check workflow run status
-3. Once complete, go to Releases tab
-4. Verify release was created with 3 APK variants
-5. Download and test one of the APKs
-
-## Troubleshooting
-
-### Build fails with "Keystore not found"
-- Check `KEYSTORE_BASE64` secret is set correctly
-- Verify base64 encoding was done without line breaks
-
-### Build fails with "Incorrect password"
-- Verify `KEYSTORE_PASSWORD` and `KEY_PASSWORD` are correct
-- Re-set secrets if needed
-
-### APK files not found
-- Check build logs for errors in assembleRelease step
-- Verify APK output paths match workflow expectations
-
-### Updates don't work
-- Ensure you're using the same keystore for all builds
-- Verify `applicationId` in build.gradle.kts matches
-
-## Security Notes
-
-- ✅ Keystore is base64-encoded in GitHub secrets (secure)
-- ✅ Passwords are stored in GitHub secrets (encrypted)
-- ✅ `key.properties` and `.jks` files are in `.gitignore`
-- ⚠️ Never commit keystore files to repository
-- ⚠️ Keep backup of keystore in secure location
-- ⚠️ Don't share keystore passwords
-
-## Versioning
-
-Versions follow this pattern:
-- **Version Name**: `YYYY.MM.DD` (e.g., `2025.01.15`)
-- **Version Code**: GitHub run number (e.g., `42`)
-- **Release Tag**: `vYYYY.MM.DD-prod.BUILD` (e.g., `v2025.01.15-prod.42`)
-
-This ensures:
-- Semantic versioning based on release date
-- Incremental version codes for Play Store compatibility
-- Clear distinction between builds
-
-## APK Variants
-
-The workflow generates 3 APK variants:
-
-1. **Universal APK** (~5 MB)
-   - Works on all devices
-   - Larger file size
-   - Recommended for most users
-
-2. **arm64-v8a APK** (~3 MB)
-   - For modern devices (2018+)
-   - Smaller, faster
-   - 64-bit ARM processors
-
-3. **armeabi-v7a APK** (~3 MB)
-   - For older devices
-   - 32-bit ARM processors
-
-Users can choose based on their device - Obtanium auto-updates work with all variants.

QUICKSTART.de.md

@@ -0,0 +1,269 @@
+# Quick Start Guide - Simple Notes Sync 📝
+
+> Schritt-für-Schritt Anleitung zur Installation und Einrichtung
+
+**🌍 Sprachen:** **Deutsch** · [English](QUICKSTART.md)
+
+---
+
+## Voraussetzungen
+
+- ✅ Android 8.0+ Smartphone/Tablet
+- ✅ WLAN-Verbindung
+- ✅ Eigener Server mit Docker (optional - für Self-Hosting)
+
+---
+
+## Option 1: Mit eigenem Server (Self-Hosted) 🏠
+
+### Schritt 1: WebDAV Server einrichten
+
+Auf deinem Server (z.B. Raspberry Pi, NAS, VPS):
+
+```bash
+# Repository klonen
+git clone https://github.com/inventory69/simple-notes-sync.git
+cd simple-notes-sync/server
+
+# Umgebungsvariablen konfigurieren
+cp .env.example .env
+nano .env
+```
+
+**In `.env` anpassen:**
+```env
+WEBDAV_PASSWORD=dein-sicheres-passwort-hier
+```
+
+**Server starten:**
+```bash
+docker compose up -d
+```
+
+**IP-Adresse finden:**
+```bash
+ip addr show | grep "inet " | grep -v 127.0.0.1
+```
+
+➡️ **Notiere dir:** `http://DEINE-SERVER-IP:8080/`
+
+---
+
+### Schritt 2: App installieren
+
+1. **APK herunterladen:** [Neueste Version](https://github.com/inventory69/simple-notes-sync/releases/latest)
+   - Wähle: `simple-notes-sync-vX.X.X-standard-universal.apk`
+   
+2. **Installation erlauben:**
+   - Android: Einstellungen → Sicherheit → "Unbekannte Quellen" für deinen Browser aktivieren
+   
+3. **APK öffnen und installieren**
+
+---
+
+### Schritt 3: App konfigurieren
+
+1. **App öffnen**
+
+2. **Einstellungen öffnen** (⚙️ Icon oben rechts)
+
+3. **Server-Einstellungen konfigurieren:**
+   
+   | Feld | Wert |
+   |------|------|
+   | **WebDAV Server URL** | `http://DEINE-SERVER-IP:8080/` |
+   | **Benutzername** | `noteuser` |
+   | **Passwort** | (dein Passwort aus `.env`) |
+
+   > **💡 Hinweis:** Gib nur die Base-URL ein (ohne `/notes`). Die App erstellt automatisch `/notes/` für JSON-Dateien und `/notes-md/` für Markdown-Export.
+
+4. **"Verbindung testen"** drücken
+   - ✅ Erfolg? → Weiter zu Schritt 4
+   - ❌ Fehler? → Siehe [Troubleshooting](#troubleshooting)
+
+5. **Auto-Sync aktivieren** (Toggle Switch)
+
+6. **Sync-Intervall wählen:**
+   - **15 Min** - Maximale Aktualität (~0.8% Akku/Tag)
+   - **30 Min** - Empfohlen (~0.4% Akku/Tag) ⭐
+   - **60 Min** - Maximale Akkulaufzeit (~0.2% Akku/Tag)
+
+---
+
+### Schritt 4: Erste Notiz erstellen
+
+1. Zurück zur Hauptansicht (← Pfeil)
+
+2. **"Notiz hinzufügen"** (+ Icon)
+
+3. Titel und Text eingeben
+
+4. **Speichern** (💾 Icon)
+
+5. **Warten auf Auto-Sync** (oder manuell: ⚙️ → "Jetzt synchronisieren")
+
+🎉 **Fertig!** Deine Notizen werden automatisch synchronisiert!
+
+---
+
+## Option 2: Nur lokale Notizen (kein Server) 📱
+
+Du kannst Simple Notes auch **ohne Server** nutzen:
+
+1. **App installieren** (siehe Schritt 2 oben)
+
+2. **Ohne Server-Konfiguration verwenden:**
+   - Notizen werden nur lokal gespeichert
+   - Kein Auto-Sync
+   - Perfekt für reine Offline-Nutzung
+
+---
+
+## 🔋 Akku-Optimierung deaktivieren
+
+Für zuverlässigen Auto-Sync:
+
+1. **Einstellungen** → **Apps** → **Simple Notes Sync**
+
+2. **Akku** → **Akkuverbrauch**
+
+3. Wähle: **"Nicht optimieren"** oder **"Unbeschränkt"**
+
+💡 **Hinweis:** Android Doze Mode kann trotzdem Sync im Standby verzögern (~60 Min). Das ist normal und betrifft alle Apps.
+
+---
+
+## 📊 Sync-Intervalle im Detail
+
+| Intervall | Syncs/Tag | Akku/Tag | Akku/Sync | Anwendungsfall |
+|-----------|-----------|----------|-----------|----------------|
+| **15 Min** | ~96 | ~0.8% (~23 mAh) | ~0.008% | ⚡ Maximal aktuell (mehrere Geräte) |
+| **30 Min** | ~48 | ~0.4% (~12 mAh) | ~0.008% | ✓ **Empfohlen** - ausgewogen |
+| **60 Min** | ~24 | ~0.2% (~6 mAh) | ~0.008% | 🔋 Maximale Akkulaufzeit |
+
+---
+
+## 🐛 Troubleshooting
+
+### Verbindungstest schlägt fehl
+
+**Problem:** "Verbindung fehlgeschlagen" beim Test
+
+**Lösungen:**
+
+1. **Server läuft?**
+   ```bash
+   docker compose ps
+   # Sollte "Up" zeigen
+   ```
+
+2. **Gleiches Netzwerk?**
+   - Smartphone und Server müssen im selben Netzwerk sein
+
+3. **IP-Adresse korrekt?**
+   ```bash
+   ip addr show | grep "inet "
+   # Prüfe ob IP in URL stimmt
+   ```
+
+4. **Firewall?**
+   ```bash
+   # Port 8080 öffnen (falls Firewall aktiv)
+   sudo ufw allow 8080/tcp
+   ```
+
+5. **Server-Logs prüfen:**
+   ```bash
+   docker compose logs -f
+   ```
+
+---
+
+### Auto-Sync funktioniert nicht
+
+**Problem:** Notizen werden nicht automatisch synchronisiert
+
+**Lösungen:**
+
+1. **Auto-Sync aktiviert?**
+   - ⚙️ Einstellungen → Toggle "Auto-Sync" muss **AN** sein
+
+2. **Akku-Optimierung deaktiviert?**
+   - Siehe [Akku-Optimierung](#-akku-optimierung-deaktivieren)
+
+3. **Mit WiFi verbunden?**
+   - Auto-Sync triggert bei jeder WiFi-Verbindung
+   - Prüfe, ob du mit einem WLAN verbunden bist
+
+4. **Manuell testen:**
+   - ⚙️ Einstellungen → "Jetzt synchronisieren"
+   - Funktioniert das? → Auto-Sync sollte auch funktionieren
+
+---
+
+### Notizen werden nicht angezeigt
+
+**Problem:** Nach Installation sind keine Notizen da, obwohl welche auf dem Server liegen
+
+**Lösung:**
+
+1. **Einmalig manuell synchronisieren:**
+   - ⚙️ Einstellungen → "Jetzt synchronisieren"
+
+2. **Server-Daten prüfen:**
+   ```bash
+   docker compose exec webdav ls -la /data/
+   # Sollte .json Dateien zeigen
+   ```
+
+---
+
+### Fehler beim Sync
+
+**Problem:** Fehlermeldung beim Synchronisieren
+
+**Lösungen:**
+
+1. **"401 Unauthorized"** → Passwort falsch
+   - Prüfe Passwort in App-Einstellungen
+   - Vergleiche mit `.env` auf Server
+
+2. **"404 Not Found"** → URL falsch
+   - Sollte enden mit `/` (z.B. `http://192.168.1.100:8080/`)
+
+3. **"Network error"** → Keine Verbindung
+   - Siehe [Verbindungstest schlägt fehl](#verbindungstest-schlägt-fehl)
+
+---
+
+## 📱 Updates
+
+### Automatisch mit Obtainium (empfohlen)
+
+1. **[Obtainium installieren](https://github.com/ImranR98/Obtanium/releases/latest)**
+
+2. **App hinzufügen:**
+   - URL: `https://github.com/inventory69/simple-notes-sync`
+   - Auto-Update aktivieren
+
+3. **Fertig!** Obtainium benachrichtigt dich bei neuen Versionen
+
+### Manuell
+
+1. Neue APK von [Releases](https://github.com/inventory69/simple-notes-sync/releases/latest) herunterladen
+
+2. Installieren (überschreibt alte Version)
+
+3. Alle Daten bleiben erhalten!
+
+---
+
+## 🆘 Weitere Hilfe
+
+- **GitHub Issues:** [Problem melden](https://github.com/inventory69/simple-notes-sync/issues)
+- **Vollständige Docs:** [DOCS.md](DOCS.md)
+- **Server Setup Details:** [server/README.md](server/README.md)
+
+---
+
+**Version:** 1.1.0 · **Erstellt:** Dezember 2025

QUICKSTART.md

@@ -1,208 +1,269 @@
-# 🚀 Quick Start Guide
+# Quick Start Guide - Simple Notes Sync 📝
 
-## ✅ Server ist bereits gestartet!
+> Step-by-step installation and setup guide
 
-Der WebDAV-Server läuft bereits auf:
-- **Lokal:** `http://localhost:8080/`
-- **Im Netzwerk:** `http://192.168.0.188:8080/`
-
-### Credentials
-- **Username:** `noteuser`
-- **Password:** `SimpleNotes2025!`
-
-## 📱 Nächste Schritte: Android App erstellen
-
-### Option 1: Mit Android Studio (Empfohlen)
-
-1. **Android Studio öffnen**
-   ```
-   File → New → New Project
-   ```
-
-2. **Template wählen:**
-   - Empty Views Activity
-
-3. **Projekt konfigurieren:**
-   ```
-   Name: Simple Notes
-   Package: com.example.simplenotes
-   Save location: /home/liq/gitProjects/simple-notes-sync/android/
-   Language: Kotlin
-   Minimum SDK: API 24 (Android 7.0)
-   Build configuration: Kotlin DSL
-   ```
-
-4. **Dependencies hinzufügen:**
-   
-   Öffne `app/build.gradle.kts` und füge hinzu:
-   ```kotlin
-   dependencies {
-       // ... existing dependencies
-       
-       // WebDAV
-       implementation("com.github.thegrizzlylabs:sardine-android:0.8")
-       
-       // Coroutines
-       implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.7.3")
-       
-       // JSON
-       implementation("com.google.code.gson:gson:2.10.1")
-       
-       // WorkManager
-       implementation("androidx.work:work-runtime-ktx:2.9.0")
-   }
-   ```
-   
-   Und in `settings.gradle.kts`:
-   ```kotlin
-   dependencyResolutionManagement {
-       repositories {
-           google()
-           mavenCentral()
-           maven { url = uri("https://jitpack.io") }  // Für Sardine
-       }
-   }
-   ```
-
-5. **Code implementieren:**
-   
-   Alle Code-Beispiele findest du in:
-   - [ANDROID_GUIDE.md](https://github.com/inventory69/project-docs/blob/main/simple-notes-sync/ANDROID_GUIDE.md)
-   
-   Kopiere der Reihe nach:
-   - `models/Note.kt`
-   - `models/SyncStatus.kt`
-   - `storage/NotesStorage.kt`
-   - `utils/DeviceIdGenerator.kt`
-   - `utils/NotificationHelper.kt`
-   - `utils/Extensions.kt`
-   - `utils/Constants.kt`
-   - UI Layouts aus dem Guide
-   - Activities (MainActivity, NoteEditorActivity, SettingsActivity)
-   - `sync/WebDavSyncService.kt`
-   - `sync/WifiSyncReceiver.kt`
-   - `sync/SyncWorker.kt`
-   - `adapters/NotesAdapter.kt`
-
-6. **AndroidManifest.xml anpassen:**
-   ```xml
-   <uses-permission android:name="android.permission.INTERNET" />
-   <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
-   <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
-   <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
-   
-   <application
-       ...
-       android:usesCleartextTraffic="true">
-   ```
-
-7. **Build & Run:**
-   ```
-   Build → Make Project
-   Run → Run 'app'
-   ```
-
-8. **In der App konfigurieren:**
-   - Einstellungen öffnen
-   - Server URL: `http://192.168.0.188:8080/`
-   - Username: `noteuser`
-   - Password: `SimpleNotes2025!`
-   - Heim-WLAN SSID: `DeinWLANName`
-   - "Verbindung testen" → sollte erfolgreich sein ✓
-
-### Option 2: Schritt-für-Schritt Implementation
-
-Folge dem [IMPLEMENTATION_PLAN.md](https://github.com/inventory69/project-docs/blob/main/simple-notes-sync/IMPLEMENTATION_PLAN.md) mit 6 Sprints:
-
-1. **Sprint 1:** Server & Foundation (bereits done ✓)
-2. **Sprint 2:** Basic UI (4-6h)
-3. **Sprint 3:** Settings & WebDAV (6h)
-4. **Sprint 4:** Auto-Sync (6h)
-5. **Sprint 5:** Conflicts & Errors (6h)
-6. **Sprint 6:** Polish & Testing (6h)
-
-## 🧪 Server testen
-
-Der Server läuft bereits. Teste ihn:
-
-```bash
-# Einfacher Test
-curl -u noteuser:SimpleNotes2025! http://localhost:8080/
-
-# Test-Notiz hochladen
-echo '{"id":"test-123","title":"Test","content":"Hello World","createdAt":1703001234567,"updatedAt":1703001234567,"deviceId":"test","syncStatus":"SYNCED"}' > test.json
-
-curl -u noteuser:SimpleNotes2025! \
-  -T test.json \
-  http://localhost:8080/test.json
-
-# Test-Notiz abrufen
-curl -u noteuser:SimpleNotes2025! http://localhost:8080/test.json
-
-# Löschen
-curl -u noteuser:SimpleNotes2025! \
-  -X DELETE \
-  http://localhost:8080/test.json
-```
-
-## 📊 Server Management
-
-```bash
-cd /home/liq/gitProjects/simple-notes-sync/server
-
-# Status
-docker-compose ps
-
-# Logs
-docker-compose logs -f
-
-# Stoppen
-docker-compose down
-
-# Neu starten
-docker-compose up -d
-
-# Daten ansehen
-ls -la notes-data/
-```
-
-## 🔧 Troubleshooting
-
-### Server nicht erreichbar von Android
-
-1. **Firewall prüfen:**
-   ```bash
-   sudo ufw status
-   sudo ufw allow 8080
-   ```
-
-2. **Ping-Test:**
-   ```bash
-   ping 192.168.0.188
-   ```
-
-3. **Port-Test:**
-   ```bash
-   telnet 192.168.0.188 8080
-   ```
-
-### Permission Denied in Android
-
-- Android 13+: POST_NOTIFICATIONS Permission akzeptieren
-- Internet Permission in Manifest vorhanden?
-- `usesCleartextTraffic="true"` gesetzt?
-
-## 📚 Weitere Hilfe
-
-- **Vollständige Doku:** [project-docs/simple-notes-sync](https://github.com/inventory69/project-docs/tree/main/simple-notes-sync)
-- **Android Code:** [ANDROID_GUIDE.md](https://github.com/inventory69/project-docs/blob/main/simple-notes-sync/ANDROID_GUIDE.md)
-- **Server Setup:** [SERVER_SETUP.md](https://github.com/inventory69/project-docs/blob/main/simple-notes-sync/SERVER_SETUP.md)
-- **Notifications:** [NOTIFICATIONS.md](https://github.com/inventory69/project-docs/blob/main/simple-notes-sync/NOTIFICATIONS.md)
+**🌍 Languages:** [Deutsch](QUICKSTART.de.md) · **English**
 
 ---
 
-**Server Status:** ✅ Running on `http://192.168.0.188:8080/`
-**Next:** Android App in Android Studio erstellen
-**Estimated Time:** 18-24 Stunden für vollständige App
+## Prerequisites
 
-Viel Erfolg! 🚀
+- ✅ Android 8.0+ smartphone/tablet
+- ✅ WiFi connection
+- ✅ Own server with Docker (optional - for self-hosting)
+
+---
+
+## Option 1: With own server (Self-Hosted) 🏠
+
+### Step 1: Setup WebDAV Server
+
+On your server (e.g. Raspberry Pi, NAS, VPS):
+
+```bash
+# Clone repository
+git clone https://github.com/inventory69/simple-notes-sync.git
+cd simple-notes-sync/server
+
+# Configure environment variables
+cp .env.example .env
+nano .env
+```
+
+**Adjust in `.env`:**
+```env
+WEBDAV_PASSWORD=your-secure-password-here
+```
+
+**Start server:**
+```bash
+docker compose up -d
+```
+
+**Find IP address:**
+```bash
+ip addr show | grep "inet " | grep -v 127.0.0.1
+```
+
+➡️ **Note down:** `http://YOUR-SERVER-IP:8080/`
+
+---
+
+### Step 2: Install App
+
+1. **Download APK:** [Latest version](https://github.com/inventory69/simple-notes-sync/releases/latest)
+   - Choose: `simple-notes-sync-vX.X.X-standard-universal.apk`
+   
+2. **Allow installation:**
+   - Android: Settings → Security → Enable "Unknown sources" for your browser
+   
+3. **Open and install APK**
+
+---
+
+### Step 3: Configure App
+
+1. **Open app**
+
+2. **Open settings** (⚙️ icon top right)
+
+3. **Configure server settings:**
+   
+   | Field | Value |
+   |------|------|
+   | **WebDAV Server URL** | `http://YOUR-SERVER-IP:8080/` |
+   | **Username** | `noteuser` |
+   | **Password** | (your password from `.env`) |
+
+   > **💡 Note:** Enter only the base URL (without `/notes`). The app automatically creates `/notes/` for JSON files and `/notes-md/` for Markdown export.
+
+4. **Press "Test connection"****
+   - ✅ Success? → Continue to step 4
+   - ❌ Error? → See [Troubleshooting](#troubleshooting)
+
+5. **Enable auto-sync** (toggle switch)
+
+6. **Choose sync interval:**
+   - **15 min** - Maximum currency (~0.8% battery/day)
+   - **30 min** - Recommended (~0.4% battery/day) ⭐
+   - **60 min** - Maximum battery life (~0.2% battery/day)
+
+---
+
+### Step 4: Create First Note
+
+1. Back to main view (← arrow)
+
+2. **"Add note"** (+ icon)
+
+3. Enter title and text
+
+4. **Save** (💾 icon)
+
+5. **Wait for auto-sync** (or manually: ⚙️ → "Sync now")
+
+🎉 **Done!** Your notes will be automatically synchronized!
+
+---
+
+## Option 2: Local notes only (no server) 📱
+
+You can also use Simple Notes **without a server**:
+
+1. **Install app** (see step 2 above)
+
+2. **Use without server configuration:**
+   - Notes are only stored locally
+   - No auto-sync
+   - Perfect for offline-only use
+
+---
+
+## 🔋 Disable Battery Optimization
+
+For reliable auto-sync:
+
+1. **Settings** → **Apps** → **Simple Notes Sync**
+
+2. **Battery** → **Battery usage**
+
+3. Select: **"Don't optimize"** or **"Unrestricted"**
+
+💡 **Note:** Android Doze Mode may still delay sync in standby (~60 min). This is normal and affects all apps.
+
+---
+
+## 📊 Sync Intervals in Detail
+
+| Interval | Syncs/day | Battery/day | Battery/sync | Use case |
+|-----------|-----------|----------|-----------|----------------|
+| **15 min** | ~96 | ~0.8% (~23 mAh) | ~0.008% | ⚡ Maximum currency (multiple devices) |
+| **30 min** | ~48 | ~0.4% (~12 mAh) | ~0.008% | ✓ **Recommended** - balanced |
+| **60 min** | ~24 | ~0.2% (~6 mAh) | ~0.008% | 🔋 Maximum battery life |
+
+---
+
+## 🐛 Troubleshooting
+
+### Connection test fails
+
+**Problem:** "Connection failed" during test
+
+**Solutions:**
+
+1. **Server running?**
+   ```bash
+   docker compose ps
+   # Should show "Up"
+   ```
+
+2. **Same network?**
+   - Smartphone and server must be on same network
+
+3. **IP address correct?**
+   ```bash
+   ip addr show | grep "inet "
+   # Check if IP in URL matches
+   ```
+
+4. **Firewall?**
+   ```bash
+   # Open port 8080 (if firewall active)
+   sudo ufw allow 8080/tcp
+   ```
+
+5. **Check server logs:**
+   ```bash
+   docker compose logs -f
+   ```
+
+---
+
+### Auto-sync not working
+
+**Problem:** Notes are not automatically synchronized
+
+**Solutions:**
+
+1. **Auto-sync enabled?**
+   - ⚙️ Settings → Toggle "Auto-sync" must be **ON**
+
+2. **Battery optimization disabled?**
+   - See [Disable Battery Optimization](#-disable-battery-optimization)
+
+3. **Connected to WiFi?**
+   - Auto-sync triggers on any WiFi connection
+   - Check if you're connected to a WiFi network
+
+4. **Test manually:**
+   - ⚙️ Settings → "Sync now"
+   - Works? → Auto-sync should work too
+
+---
+
+### Notes not showing up
+
+**Problem:** After installation, no notes visible even though they exist on server
+
+**Solution:**
+
+1. **Manually sync once:**
+   - ⚙️ Settings → "Sync now"
+
+2. **Check server data:**
+   ```bash
+   docker compose exec webdav ls -la /data/
+   # Should show .json files
+   ```
+
+---
+
+### Sync errors
+
+**Problem:** Error message during sync
+
+**Solutions:**
+
+1. **"401 Unauthorized"** → Wrong password
+   - Check password in app settings
+   - Compare with `.env` on server
+
+2. **"404 Not Found"** → Wrong URL
+   - Should end with `/` (e.g. `http://192.168.1.100:8080/`)
+
+3. **"Network error"** → No connection
+   - See [Connection test fails](#connection-test-fails)
+
+---
+
+## 📱 Updates
+
+### Automatic with Obtainium (recommended)
+
+1. **[Install Obtainium](https://github.com/ImranR98/Obtanium/releases/latest)**
+
+2. **Add app:**
+   - URL: `https://github.com/inventory69/simple-notes-sync`
+   - Enable auto-update
+
+3. **Done!** Obtainium notifies you of new versions
+
+### Manual
+
+1. Download new APK from [Releases](https://github.com/inventory69/simple-notes-sync/releases/latest)
+
+2. Install (overwrites old version)
+
+3. All data remains intact!
+
+---
+
+## 🆘 Further Help
+
+- **GitHub Issues:** [Report problem](https://github.com/inventory69/simple-notes-sync/issues)
+- **Complete docs:** [DOCS.en.md](DOCS.en.md)
+- **Server setup details:** [server/README.en.md](server/README.en.md)
+
+---
+
+**Version:** 1.1.0 · **Created:** December 2025

README.de.md

@@ -0,0 +1,143 @@
+<div align="center">
+<img src="android/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png" alt="Logo" />
+</div>
+
+<h1 align="center">Simple Notes Sync</h1>
+
+<h4 align="center">Minimalistische Offline-Notizen mit intelligentem Sync - Einfachheit trifft smarte Synchronisation.</h4>
+
+<div align="center">
+  
+[![Android](https://img.shields.io/badge/Android-8.0%2B-3DDC84?style=for-the-badge&logo=android&logoColor=white)](https://www.android.com/)
+[![Kotlin](https://img.shields.io/badge/Kotlin-7F52FF?style=for-the-badge&logo=kotlin&logoColor=white)](https://kotlinlang.org/)
+[![Jetpack Compose](https://img.shields.io/badge/Jetpack%20Compose-4285F4?style=for-the-badge&logo=jetpackcompose&logoColor=white)](https://developer.android.com/compose/)
+[![Material 3](https://img.shields.io/badge/Material_3-6750A4?style=for-the-badge&logo=material-design&logoColor=white)](https://m3.material.io/)
+[![License](https://img.shields.io/badge/License-MIT-F5C400?style=for-the-badge)](LICENSE)
+
+</div>
+
+<div align="center">
+
+<a href="https://apt.izzysoft.de/fdroid/index/apk/dev.dettmer.simplenotes">
+<img src="https://gitlab.com/IzzyOnDroid/repo/-/raw/master/assets/IzzyOnDroid.png"
+alt="Get it on IzzyOnDroid" align="center" height="80" /></a>
+
+<a href="https://apps.obtainium.imranr.dev/redirect.html?r=obtainium://add/https://github.com/inventory69/simple-notes-sync">
+<img src="https://github.com/ImranR98/Obtainium/blob/main/assets/graphics/badge_obtainium.png"
+alt="Get it on Obtainium" align="center" height="54" />
+</a>
+
+<a href="https://f-droid.org/packages/dev.dettmer.simplenotes">
+<img src="https://f-droid.org/badge/get-it-on.png"
+alt="Get it on F-Droid" align="center" height="80" /></a>
+
+</div>
+
+<div align="center">
+<strong>SHA-256 Hash des Signaturzertifikats:</strong><br /> 42:A1:C6:13:BB:C6:73:04:5A:F3:DC:81:91:BF:9C:B6:45:6E:E4:4C:7D:CE:40:C7:CF:B5:66:FA:CB:69:F1:6A
+</div>
+
+<div align="center">
+
+<br />[📱 APK Download](https://github.com/inventory69/simple-notes-sync/releases/latest) · [📖 Dokumentation](docs/DOCS.de.md) · [🚀 Schnellstart](QUICKSTART.de.md)<br />
+**🌍** Deutsch · [English](README.md)
+
+</div>
+
+## 📱 Screenshots
+
+<p align="center">
+  <img src="fastlane/metadata/android/de-DE/images/phoneScreenshots/1.png" width="250" alt="Sync status">
+  <img src="fastlane/metadata/android/de-DE/images/phoneScreenshots/2.png" width="250" alt="Edit note">
+  <img src="fastlane/metadata/android/de-DE/images/phoneScreenshots/3.png" width="250" alt="Edit checklist">
+  <img src="fastlane/metadata/android/de-DE/images/phoneScreenshots/4.png" width="250" alt="Settings">
+  <img src="fastlane/metadata/android/de-DE/images/phoneScreenshots/5.png" width="250" alt="Server settings">
+  <img src="fastlane/metadata/android/de-DE/images/phoneScreenshots/7.png" width="250" alt="Sync settings">
+</p>
+
+<div align="center">
+
+  📝 Offline-first &nbsp;•&nbsp; 🔄 Smart Sync &nbsp;•&nbsp; 🔒 Self-hosted &nbsp;•&nbsp; 🔋 Akkuschonend
+
+</div>
+
+## ✨ Highlights
+
+- 📝 **Offline-first** – Funktioniert ohne Internet
+- 📊 **Flexible Ansichten** – Listen- und Grid-Layout
+- ✅ **Checklisten** – Tap-to-Check, Drag & Drop
+- 🌍 **Mehrsprachig** – Deutsch/Englisch mit Sprachauswahl
+- 🔄 **Konfigurierbare Sync-Trigger** – onSave, onResume, WiFi, periodisch (15/30/60 Min), Boot
+- 🔒 **Self-hosted** – Deine Daten bleiben bei dir (WebDAV)
+- 💾 **Lokales Backup** – Export/Import als JSON-Datei (optional verschlüsselt)
+- 🖥️ **Desktop-Integration** – Markdown-Export für Obsidian, VS Code, Typora
+- 🔋 **Akkuschonend** – ~0.2% mit Defaults, bis zu ~1.0% mit Periodic Sync
+- 🎨 **Material Design 3** – Dynamischer Dark/Light Mode & Farben
+
+➡️ **Vollständige Feature-Liste:** [docs/FEATURES.de.md](docs/FEATURES.de.md)
+
+## 🚀 Schnellstart
+
+### 1. Server Setup (5 Minuten)
+
+```bash
+git clone https://github.com/inventory69/simple-notes-sync.git
+cd simple-notes-sync/server
+cp .env.example .env
+# Passwort in .env setzen
+docker compose up -d
+```
+
+➡️ **Details:** [Server Setup Guide](server/README.de.md)
+
+### 2. App Installation (2 Minuten)
+
+1. [APK herunterladen](https://github.com/inventory69/simple-notes-sync/releases/latest)
+2. Installieren & öffnen
+3. ⚙️ Einstellungen → Server konfigurieren:
+  - **URL:** `http://DEINE-SERVER-IP:8080/` _(nur Base-URL!)_
+  - **User:** `noteuser`
+  - **Passwort:** _(aus .env)_
+  - **WLAN:** _(dein Netzwerk-Name)_
+4. **Verbindung testen** → Auto-Sync aktivieren
+5. Fertig! 🎉
+
+➡️ **Ausführliche Anleitung:** [QUICKSTART.de.md](QUICKSTART.de.md)
+
+## 📚 Dokumentation
+
+| Dokument | Inhalt |
+|----------|--------|
+| **[QUICKSTART.de.md](QUICKSTART.de.md)** | Schritt-für-Schritt Installation |
+| **[FEATURES.de.md](docs/FEATURES.de.md)** | Vollständige Feature-Liste |
+| **[BACKUP.de.md](docs/BACKUP.de.md)** | Backup & Wiederherstellung |
+| **[DESKTOP.de.md](docs/DESKTOP.de.md)** | Desktop-Integration (Markdown) |
+| **[SELF_SIGNED_SSL.md](docs/SELF_SIGNED_SSL.md)** | Self-signed SSL Zertifikat Setup |
+| **[DOCS.de.md](docs/DOCS.de.md)** | Technische Details & Troubleshooting |
+| **[CHANGELOG.de.md](CHANGELOG.de.md)** | Versionshistorie |
+| **[UPCOMING.de.md](docs/UPCOMING.de.md)** | Geplante Features 🚀 |
+| **[ÜBERSETZEN.md](docs/TRANSLATING.de.md)** | Übersetzungsanleitung 🌍 |
+
+## 🛠️ Entwicklung
+
+```bash
+cd android
+./gradlew assembleStandardRelease
+```
+
+➡️ **Build-Anleitung:** [docs/DOCS.de.md#-build--deployment](docs/DOCS.de.md#-build--deployment)
+
+## 🤝 Contributing
+
+Beiträge willkommen! Siehe [CONTRIBUTING.md](CONTRIBUTING.md)
+
+## 📄 Lizenz
+
+MIT License – siehe [LICENSE](LICENSE)
+
+<div align="center">
+<br /><br />
+
+**v1.7.0** · Built with ❤️ using Kotlin + Jetpack Compose + Material Design 3
+
+</div>

README.md

@@ -1,137 +1,153 @@
-# Simple Notes Sync 📝
+<div align="center">
+<img src="android/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png" alt="Logo" />
+</div>
 
-> **Minimalistische Android Notiz-App mit automatischer WLAN-Synchronisierung**
+<h1 align="center">Simple Notes Sync</h1>
 
-[![Android](https://img.shields.io/badge/Android-8.0%2B-green.svg)](https://www.android.com/)
-[![Kotlin](https://img.shields.io/badge/Kotlin-1.9%2B-blue.svg)](https://kotlinlang.org/)
-[![Material Design 3](https://img.shields.io/badge/Material-Design%203-green.svg)](https://m3.material.io/)
-[![License](https://img.shields.io/badge/License-MIT-yellow.svg)](LICENSE)
+<h4 align="center">Clean, offline-first notes with intelligent sync - simplicity meets smart synchronization.</h4>
 
-Schlanke Offline-Notizen ohne Schnickschnack - deine Daten bleiben bei dir. Automatische Synchronisierung zu deinem eigenen WebDAV-Server, kein Google, kein Microsoft, keine Cloud.
+<div align="center">
   
-## ✨ Features
+[![Android](https://img.shields.io/badge/Android-8.0%2B-3DDC84?style=for-the-badge&logo=android&logoColor=white)](https://www.android.com/)
+[![Kotlin](https://img.shields.io/badge/Kotlin-7F52FF?style=for-the-badge&logo=kotlin&logoColor=white)](https://kotlinlang.org/)
+[![Jetpack Compose](https://img.shields.io/badge/Jetpack%20Compose-4285F4?style=for-the-badge&logo=jetpackcompose&logoColor=white)](https://developer.android.com/compose/)
+[![Material 3](https://img.shields.io/badge/Material_3-6750A4?style=for-the-badge&logo=material-design&logoColor=white)](https://m3.material.io/)
+[![License](https://img.shields.io/badge/License-MIT-F5C400?style=for-the-badge)](LICENSE)
 
-- 📝 **Offline-First** - Notizen lokal gespeichert, immer verfügbar
-- 🔄 **Auto-Sync** - Konfigurierbare Intervalle (15/30/60 Min.) mit ~0.2-0.8% Akku/Tag
-- 🏠 **Self-Hosted** - Deine Daten auf deinem Server (WebDAV)
-- 🎨 **Material Design 3** - Modern & Dynamic Theming
-- 🔋 **Akkuschonend** - Optimiert für Hintergrund-Synchronisierung
-- 🔐 **Privacy-First** - Kein Tracking, keine Analytics, keine Cloud
-- 🚫 **Keine Berechtigungen** - Nur Internet für WebDAV Sync
+</div>
 
-## 📥 Quick Download
+<div align="center">
 
-**Android APK:** [📱 Neueste Version herunterladen](https://github.com/inventory69/simple-notes-sync/releases/latest)
+<a href="https://apt.izzysoft.de/fdroid/index/apk/dev.dettmer.simplenotes">
+<img src="https://gitlab.com/IzzyOnDroid/repo/-/raw/master/assets/IzzyOnDroid.png"
+alt="Get it on IzzyOnDroid" align="center" height="80" /></a>
 
-💡 **Tipp:** Nutze [Obtainium](https://github.com/ImranR98/Obtainium) für automatische Updates!
+<a href="https://apps.obtainium.imranr.dev/redirect.html?r=obtainium://add/https://github.com/inventory69/simple-notes-sync">
+<img src="https://github.com/ImranR98/Obtainium/blob/main/assets/graphics/badge_obtainium.png"
+alt="Get it on Obtainium" align="center" height="54" />
+</a>
 
----
+<a href="https://f-droid.org/packages/dev.dettmer.simplenotes">
+<img src="https://f-droid.org/badge/get-it-on.png"
+alt="Get it on F-Droid" align="center" height="80" /></a>
   
-## 🚀 Schnellstart
+</div>
 
-### 1️⃣ WebDAV Server starten
+<div align="center">
+<strong>SHA-256 hash of the signing certificate:</strong><br />42:A1:C6:13:BB:C6:73:04:5A:F3:DC:81:91:BF:9C:B6:45:6E:E4:4C:7D:CE:40:C7:CF:B5:66:FA:CB:69:F1:6A
+</div>
 
-```fish
-cd server
+<div align="center">
+
+<br />[📱 APK Download](https://github.com/inventory69/simple-notes-sync/releases/latest) · [📖 Documentation](docs/DOCS.md) · [🚀 Quick Start](QUICKSTART.md)<br />
+**🌍** [Deutsch](README.de.md) · **English**
+
+</div>
+
+## 📱 Screenshots
+
+<p align="center">
+  <img src="fastlane/metadata/android/en-US/images/phoneScreenshots/1.png" width="250" alt="Sync status">
+  <img src="fastlane/metadata/android/en-US/images/phoneScreenshots/2.png" width="250" alt="Edit note">
+  <img src="fastlane/metadata/android/en-US/images/phoneScreenshots/3.png" width="250" alt="Edit checklist">
+  <img src="fastlane/metadata/android/en-US/images/phoneScreenshots/4.png" width="250" alt="Settings">
+  <img src="fastlane/metadata/android/en-US/images/phoneScreenshots/5.png" width="250" alt="Server settings">
+  <img src="fastlane/metadata/android/en-US/images/phoneScreenshots/7.png" width="250" alt="Sync settings">
+</p>
+
+<div align="center">
+
+  📝 Offline-first &nbsp;•&nbsp; 🔄 Smart Sync &nbsp;•&nbsp; 🔒 Self-hosted &nbsp;•&nbsp; 🔋 Battery-friendly
+
+</div>
+
+## ✨ Highlights
+
+- 📝 **Offline-first** - Works without internet
+- 📊 **Flexible views** - Switch between list and grid layout
+- ✅ **Checklists** - Tap-to-check, drag & drop
+- 🌍 **Multilingual** - English/German with language selector
+- 🔄 **Configurable sync triggers** - onSave, onResume, WiFi-connect, periodic (15/30/60 min), boot
+- 🔒 **Self-hosted** - Your data stays with you (WebDAV)
+- 💾 **Local backup** - Export/Import as JSON file (encryption available)
+- 🖥️ **Desktop integration** - Markdown export for Obsidian, VS Code, Typora
+- 🔋 **Battery-friendly** - ~0.2% with defaults, up to ~1.0% with periodic sync
+- 🎨 **Material Design 3** - Dynamic dark/light mode & colors based on system settings
+
+➡️ **Complete feature list:** [FEATURES.md](docs/FEATURES.md)
+
+## 🚀 Quick Start
+
+### 1. Server Setup (5 minutes)
+
+```bash
+git clone https://github.com/inventory69/simple-notes-sync.git
+cd simple-notes-sync/server
 cp .env.example .env
-# Passwort in .env anpassen
+# Set password in .env
 docker compose up -d
 ```
 
-### 2️⃣ App installieren & konfigurieren
+➡️ **Details:** [Server Setup Guide](server/README.md)
 
-1. APK herunterladen und installieren
-2. App öffnen → **Einstellungen** (⚙️)
-3. Server konfigurieren:
-   - URL: `http://192.168.0.XXX:8080/notes`
-   - Benutzername: `noteuser`
-   - Passwort: (aus `.env`)
-4. **Auto-Sync aktivieren**
-5. **Sync-Intervall wählen** (15/30/60 Min.)
+### 2. App Installation (2 minutes)
 
-**Fertig!** Notizen werden automatisch synchronisiert 🎉
+1. [Download APK](https://github.com/inventory69/simple-notes-sync/releases/latest)
+2. Install & open
+3. ⚙️ Settings → Configure server:
+   - **URL:** `http://YOUR-SERVER-IP:8080/` _(base URL only!)_
+   - **User:** `noteuser`
+   - **Password:** _(from .env)_
+   - **WiFi:** _(your network name)_
+4. **Test connection** → Enable auto-sync
+5. Done! 🎉
 
----
+➡️ **Detailed guide:** [QUICKSTART.md](QUICKSTART.md)
 
-## ⚙️ Sync-Intervalle
+## 📚 Documentation
 
-| Intervall | Akku/Tag | Anwendungsfall |
-|-----------|----------|----------------|
-| **15 Min** | ~0.8% (~23 mAh) | ⚡ Maximale Aktualität |
-| **30 Min** | ~0.4% (~12 mAh) | ✓ Empfohlen - Ausgewogen |
-| **60 Min** | ~0.2% (~6 mAh) | 🔋 Maximale Akkulaufzeit |
+| Document | Content |
+|----------|---------|
+| **[QUICKSTART.md](QUICKSTART.md)** | Step-by-step installation |
+| **[FEATURES.md](docs/FEATURES.md)** | Complete feature list |
+| **[BACKUP.md](docs/BACKUP.md)** | Backup & restore guide |
+| **[DESKTOP.md](docs/DESKTOP.md)** | Desktop integration (Markdown) |
+| **[SELF_SIGNED_SSL.md](docs/SELF_SIGNED_SSL.md)** | Self-signed SSL certificate setup |
+| **[DOCS.md](docs/DOCS.md)** | Technical details & troubleshooting |
+| **[CHANGELOG.md](CHANGELOG.md)** | Version history |
+| **[UPCOMING.md](docs/UPCOMING.md)** | Upcoming features 🚀 |
+| **[TRANSLATING.md](docs/TRANSLATING.md)** | Translation guide 🌍 |
 
-💡 **Hinweis:** Android Doze Mode kann Sync im Standby auf ~60 Min. verzögern (betrifft alle Apps).
-
----
-
-## <20> Neue Features in v1.1.0
-
-### Konfigurierbare Sync-Intervalle
-- ⏱️ Wählbare Intervalle: 15/30/60 Minuten
-- 📊 Transparente Akkuverbrauchs-Anzeige
-- <20> Sofortige Anwendung ohne App-Neustart
-
-### Über-Sektion
-- <20> App-Version & Build-Datum
-- 🌐 Links zu GitHub Repo & Entwickler
-- ⚖️ Lizenz-Information
-
-### Verbesserungen
-- 🎯 Benutzerfreundliche Doze-Mode Erklärung
-- 🔕 Keine störenden Sync-Fehler Toasts im Hintergrund
-- 📝 Erweiterte Debug-Logs für Troubleshooting
-
----
-
-## 🛠️ Selbst bauen
-
-```fish
+```bash
 cd android
 ./gradlew assembleStandardRelease
-# APK: android/app/build/outputs/apk/standard/release/
 ```
 
----
+➡️ **Build guide:** [DOCS.md](docs/DOCS.md#-build--deployment)
 
-## 🐛 Troubleshooting
+## 💡 Feature Requests & Ideas
 
-### Auto-Sync funktioniert nicht
+Have an idea for a new feature or improvement? We'd love to hear it!
 
-1. **Akku-Optimierung deaktivieren**
-   - Einstellungen → Apps → Simple Notes → Akku → Nicht optimieren
-2. **WLAN-Verbindung prüfen**
-   - Funktioniert nur im selben Netzwerk wie Server
-3. **Server-Status checken**
-   - Settings → "Verbindung testen"
+➡️ **How to suggest features:**
 
-### Server nicht erreichbar
+1. Check [existing discussions](https://github.com/inventory69/simple-notes-sync/discussions) to see if someone already suggested it
+2. If not, start a new discussion in the "Feature Requests / Ideas" category
+3. Upvote (👍) features you'd like to see
 
-```fish
-# Status prüfen
-docker compose ps
-
-# Logs ansehen
-docker compose logs -f
-
-# IP-Adresse finden
-ip addr show | grep "inet " | grep -v 127.0.0.1
-```
-
-Mehr Details: [📖 Dokumentation](DOCS.md)
-
----
+Features with enough community support will be considered for implementation. Please keep in mind that this app is designed to stay simple and user-friendly.
 
 ## 🤝 Contributing
 
-Contributions sind willkommen! Bitte öffne ein Issue oder Pull Request.
+Contributions welcome! See [CONTRIBUTING.md](CONTRIBUTING.md)
 
----
+## 📄 License
 
-## 📄 Lizenz
+MIT License - see [LICENSE](LICENSE)
 
-MIT License - siehe [LICENSE](LICENSE)
+<div align="center">
+<br /><br />
 
----
+**v1.7.0** · Built with ❤️ using Kotlin + Jetpack Compose + Material Design 3
 
-**Version:** 1.1.0 · **Status:** ✅ Produktiv · **Gebaut mit:** Kotlin + Material Design 3
+</div>

README.old.md

@@ -1,335 +0,0 @@
-# Simple Notes Sync 📝
-
-> Minimalistische Android-App für Offline-Notizen mit automatischer WLAN-Synchronisierung
-
-Eine schlanke Notiz-App ohne Schnickschnack - perfekt für schnelle Gedanken, die automatisch zu Hause synchronisiert werden.
-
----
-
-## ✨ Features
-
-- 📝 **Offline-first** - Notizen werden lokal gespeichert und sind immer verfügbar
-- 🔄 **Auto-Sync** - Automatische Synchronisierung wenn du im Heimnetzwerk bist
-- 🏠 **WebDAV Server** - Deine Daten bleiben bei dir (Docker-Container)
-- 🔋 **Akkuschonend** - Nur ~0.4% Akkuverbrauch pro Tag
-- 🚫 **Keine Cloud** - Keine Google, keine Microsoft, keine Drittanbieter
-- 🔐 **Privacy** - Keine Tracking, keine Analytics, keine Standort-Berechtigungen
-
----
-
-## 📥 Installation
-
-### Android App
-
-**Option 1: APK herunterladen**
-
-1. Neueste [Release](../../releases/latest) öffnen
-2. `app-debug.apk` herunterladen
-3. APK auf dem Handy installieren
-
-**Option 2: Selbst bauen**
-
-```bash
-cd android
-./gradlew assembleDebug
-# APK: android/app/build/outputs/apk/debug/app-debug.apk
-```
-
-### WebDAV Server
-
-Der Server läuft als Docker-Container und speichert deine Notizen.
-
-```bash
-cd server
-cp .env.example .env
-nano .env  # Passwort anpassen!
-docker-compose up -d
-```
-
-**Server testen:**
-```bash
-curl -u noteuser:dein_passwort http://192.168.0.XXX:8080/
-```
-
----
-
-## 🚀 Schnellstart
-
-1. **Server starten** (siehe oben)
-2. **App installieren** und öffnen
-3. **Einstellungen öffnen** (⚙️ Symbol oben rechts)
-4. **Server konfigurieren:**
-   - Server-URL: `http://192.168.0.XXX:8080/notes`
-   - Benutzername: `noteuser`
-   - Passwort: (aus `.env` Datei)
-   - Auto-Sync: **AN**
-5. **Fertig!** Notizen werden jetzt automatisch synchronisiert
-
----
-
-## 💡 Wie funktioniert Auto-Sync?
-
-Die App prüft **alle 30 Minuten**, ob:
-- ✅ WLAN verbunden ist
-- ✅ Server im gleichen Netzwerk erreichbar ist
-- ✅ Neue Notizen vorhanden sind
-
-Wenn alle Bedingungen erfüllt → **Automatische Synchronisierung**
-
-**Wichtig:** Funktioniert nur im selben Netzwerk wie der Server (kein Internet-Zugriff nötig!)
-
----
-
-## 🔋 Akkuverbrauch
-
-| Komponente | Verbrauch/Tag |
-|------------|---------------|
-| WorkManager (alle 30 Min) | ~0.3% |
-| Netzwerk-Checks | ~0.1% |
-| **Total** | **~0.4%** |
-
-Bei einem 3000 mAh Akku entspricht das ~12 mAh pro Tag.
-
----
-
-## 📱 Screenshots
-
-_TODO: Screenshots hinzufügen_
-
----
-
-## 🛠️ Technische Details
-
-Mehr Infos zur Architektur und Implementierung findest du in der [technischen Dokumentation](DOCS.md).
-
-**Stack:**
-- **Android:** Kotlin, Material Design 3, WorkManager
-- **Server:** Docker, WebDAV (bytemark/webdav)
-- **Sync:** Sardine Android (WebDAV Client)
-
----
-
-## 📄 Lizenz
-
-[Lizenz hier einfügen]
-
----
-
-## 🤝 Beitragen
-
-Contributions sind willkommen! Bitte öffne ein Issue oder Pull Request.
-
----
-
-## 📄 Lizenz
-
-MIT License - siehe [LICENSE](LICENSE)
-
----
-
-**Projekt Start:** 19. Dezember 2025  
-**Status:** ✅ Funktional & Produktiv
-
-## 📖 Dokumentation
-
-### In diesem Repository:
-
-- **[QUICKSTART.md](QUICKSTART.md)** - Schnellstart-Anleitung
-- **[server/README.md](server/README.md)** - Server-Verwaltung
-
-### Vollständige Dokumentation (project-docs):
-
-- [README.md](https://github.com/inventory69/project-docs/blob/main/simple-notes-sync/README.md) - Projekt-Übersicht & Architektur
-- [IMPLEMENTATION_PLAN.md](https://github.com/inventory69/project-docs/blob/main/simple-notes-sync/IMPLEMENTATION_PLAN.md) - Detaillierter Sprint-Plan
-- [SERVER_SETUP.md](https://github.com/inventory69/project-docs/blob/main/simple-notes-sync/SERVER_SETUP.md) - Server-Setup Details
-- [ANDROID_GUIDE.md](https://github.com/inventory69/project-docs/blob/main/simple-notes-sync/ANDROID_GUIDE.md) - 📱 Kompletter Android-Code
-- [NOTIFICATIONS.md](https://github.com/inventory69/project-docs/blob/main/simple-notes-sync/NOTIFICATIONS.md) - Notification-System Details
-- [WINDOWS_SETUP.md](https://github.com/inventory69/project-docs/blob/main/simple-notes-sync/WINDOWS_SETUP.md) - 🪟 Windows + Android Studio Setup
-- [CODE_REFERENCE.md](https://github.com/inventory69/project-docs/blob/main/simple-notes-sync/CODE_REFERENCE.md) - Schnelle Code-Referenz
-
-## ⚙️ Server Konfiguration
-
-**Standard-Credentials:**
-- Username: `noteuser`
-- Password: Siehe `.env` im `server/` Verzeichnis
-
-**Server-URL:**
-- Lokal: `http://localhost:8080/`
-- Im Netzwerk: `http://YOUR_IP:8080/`
-
-IP-Adresse finden:
-```bash
-ip addr show | grep "inet " | grep -v 127.0.0.1
-```
-
-## 📱 Android App Setup
-
-### Vorraussetzungen
-
-- Android Studio Hedgehog (2023.1.1) oder neuer
-- JDK 17
-- Min SDK 24 (Android 7.0)
-- Target SDK 34 (Android 14)
-
-### In App konfigurieren
-
-1. App starten
-2. Einstellungen öffnen
-3. Server-URL eintragen (z.B. `http://192.168.1.100:8080/`)
-4. Username & Passwort eingeben
-5. Heim-WLAN SSID eingeben
-6. "Verbindung testen"
-
-## 🔧 Entwicklung
-
-### Server-Management
-
-```bash
-# Status prüfen
-docker-compose ps
-
-# Logs anschauen
-docker-compose logs -f
-
-# Neustarten
-docker-compose restart
-
-# Stoppen
-docker-compose down
-```
-
-### Android-Build
-
-```bash
-cd android
-./gradlew assembleDebug
-
-# APK Location:
-# app/build/outputs/apk/debug/app-debug.apk
-```
-
-## 🧪 Testing
-
-### Server-Test
-
-```bash
-# Testdatei hochladen
-echo '{"id":"test","title":"Test","content":"Hello"}' > test.json
-curl -u noteuser:password -T test.json http://localhost:8080/test.json
-
-# Datei abrufen
-curl -u noteuser:password http://localhost:8080/test.json
-
-# Datei löschen
-curl -u noteuser:password -X DELETE http://localhost:8080/test.json
-```
-
-### Android-App
-
-1. Notiz erstellen → speichern → in Liste sichtbar ✓
-2. WLAN verbinden → Auto-Sync ✓
-3. Server offline → Fehlermeldung ✓
-4. Konflikt-Szenario → Auflösung ✓
-
-## 📦 Deployment
-
-### Server (Production)
-
-**Option 1: Lokaler Server (Raspberry Pi, etc.)**
-```bash
-docker-compose up -d
-```
-
-**Option 2: VPS (DigitalOcean, Hetzner, etc.)**
-```bash
-# Mit HTTPS (empfohlen)
-# Zusätzlich: Reverse Proxy (nginx/Caddy) + Let's Encrypt
-```
-
-### Android App
-
-```bash
-# Release Build
-./gradlew assembleRelease
-
-# APK signieren
-# Play Store Upload oder Direct Install
-```
-
-## 🔐 Security
-
-**Entwicklung:**
-- ✅ HTTP Basic Auth
-- ✅ Nur im lokalen Netzwerk
-
-**Produktion:**
-- ⚠️ HTTPS mit SSL/TLS (empfohlen)
-- ⚠️ Starkes Passwort
-- ⚠️ Firewall-Regeln
-- ⚠️ VPN für externen Zugriff
-
-## 🐛 Troubleshooting
-
-### Server startet nicht
-
-```bash
-# Port bereits belegt?
-sudo netstat -tlnp | grep 8080
-
-# Logs checken
-docker-compose logs webdav
-```
-
-### Android kann nicht verbinden
-
-- Ist Android im gleichen WLAN?
-- Ist die Server-IP korrekt?
-- Firewall blockiert Port 8080?
-- Credentials korrekt?
-
-```bash
-# Ping zum Server
-ping YOUR_SERVER_IP
-
-# Port erreichbar?
-telnet YOUR_SERVER_IP 8080
-```
-
-## 📝 TODO / Roadmap
-
-### Version 1.0 (MVP)
-- [x] Docker WebDAV Server
-- [ ] Android Basic CRUD
-- [ ] Auto-Sync bei WLAN
-- [ ] Error Handling
-- [ ] Notifications
-
-### Version 1.1
-- [ ] Suche
-- [ ] Dark Mode
-- [ ] Markdown-Support
-
-### Version 2.0
-- [ ] Desktop-Client (Flutter Desktop)
-- [ ] Tags/Kategorien
-- [ ] Verschlüsselung
-- [ ] Shared Notes
-
-## 📄 License
-
-MIT License - siehe [LICENSE](LICENSE)
-
-## 👤 Author
-
-Created for personal use - 2025
-
-## 🙏 Acknowledgments
-
-- [bytemark/webdav](https://hub.docker.com/r/bytemark/webdav) - Docker WebDAV Server
-- [Sardine Android](https://github.com/thegrizzlylabs/sardine-android) - WebDAV Client
-- [Android WorkManager](https://developer.android.com/topic/libraries/architecture/workmanager) - Background Tasks
-
----
-
-**Project Start:** 19. Dezember 2025
-**Status:** 🚧 In Development

android/.editorconfig

@@ -0,0 +1,61 @@
+# ⚡ v1.3.1: EditorConfig for ktlint
+# https://editorconfig.org
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+max_line_length = 120
+trim_trailing_whitespace = true
+
+[*.{kt,kts}]
+# ktlint rules
+ktlint_code_style = android_studio
+ktlint_standard_no-wildcard-imports = disabled
+ktlint_standard_package-name = enabled
+ktlint_standard_filename = enabled
+ktlint_standard_class-naming = enabled
+ktlint_standard_function-naming = enabled
+ktlint_standard_property-naming = enabled
+ktlint_standard_backing-property-naming = enabled
+ktlint_standard_enum-entry-name-case = enabled
+ktlint_standard_multiline-if-else = enabled
+ktlint_standard_no-empty-class-body = enabled
+ktlint_standard_no-empty-first-line-in-class-body = enabled
+ktlint_standard_blank-line-before-declaration = enabled
+ktlint_standard_context-receiver-wrapping = enabled
+ktlint_standard_function-expression-body = disabled
+ktlint_standard_function-literal = enabled
+ktlint_standard_function-type-modifier-spacing = enabled
+ktlint_standard_kdoc-wrapping = enabled
+ktlint_standard_modifier-list-spacing = enabled
+ktlint_standard_no-blank-line-in-list = enabled
+ktlint_standard_no-consecutive-comments = disabled
+ktlint_standard_no-single-line-block-comment = enabled
+ktlint_standard_parameter-list-spacing = enabled
+ktlint_standard_parameter-list-wrapping = enabled
+ktlint_standard_property-wrapping = enabled
+ktlint_standard_spacing-between-function-name-and-opening-parenthesis = enabled
+ktlint_standard_statement-wrapping = enabled
+ktlint_standard_string-template-indent = disabled
+ktlint_standard_try-catch-finally-spacing = enabled
+ktlint_standard_type-argument-list-spacing = enabled
+ktlint_standard_type-parameter-list-spacing = enabled
+ktlint_standard_value-argument-comment = enabled
+ktlint_standard_value-parameter-comment = enabled
+
+[*.md]
+trim_trailing_whitespace = false
+
+[*.{xml,json}]
+indent_size = 2
+
+[*.yml]
+indent_size = 2
+
+[Makefile]
+indent_style = tab

android/.gitignore

@@ -13,3 +13,8 @@
 .externalNativeBuild
 .cxx
 local.properties
+
+# Signing configuration (contains sensitive keys)
+key.properties
+*.jks
+*.keystore

android/LOCAL_BUILDS.md

@@ -0,0 +1,157 @@
+# Lokale Gradle Builds mit Release-Signierung
+
+Dieses Dokument erklärt, wie du lokal signierte APKs erstellst, die mit den GitHub Release-APKs kompatibel sind.
+
+## Problem
+
+- **GitHub Actions** erstellt signierte Release-APKs mit dem Production-Keystore
+- **Lokale Debug-Builds** verwenden einen temporären Debug-Key
+- ❌ **Resultat:** Nutzer können lokale Debug-APKs NICHT über Release-APKs installieren (Signature Mismatch!)
+
+## Lösung: Lokale Release-Builds mit Production-Key
+
+### 1️⃣ Keystore-Konfiguration einrichten
+
+Du hast bereits den Keystore: `/android/app/simple-notes-release.jks`
+
+Erstelle eine `key.properties` Datei im `/android/` Ordner:
+
+```bash
+cd /home/liq/gitProjects/simple-notes-sync/android
+cp key.properties.example key.properties
+```
+
+Bearbeite `key.properties` mit den echten Werten:
+
+```properties
+storeFile=simple-notes-release.jks
+storePassword=<dein-keystore-password>
+keyAlias=<dein-key-alias>
+keyPassword=<dein-key-password>
+```
+
+**Wichtig:** Die Werte müssen **exakt** mit den GitHub Secrets übereinstimmen:
+- `KEYSTORE_PASSWORD` → `storePassword`
+- `KEY_ALIAS` → `keyAlias`
+- `KEY_PASSWORD` → `keyPassword`
+
+### 2️⃣ Lokal signierte Release-APKs bauen
+
+```bash
+cd android
+./gradlew assembleStandardRelease
+```
+
+Die signierten APKs findest du dann hier:
+```
+android/app/build/outputs/apk/standard/release/
+├── app-standard-universal-release.apk
+├── app-standard-arm64-v8a-release.apk
+└── app-standard-armeabi-v7a-release.apk
+```
+
+### 3️⃣ F-Droid Flavor bauen (optional)
+
+```bash
+./gradlew assembleFdroidRelease
+```
+
+### 4️⃣ Beide Flavors gleichzeitig bauen
+
+```bash
+./gradlew assembleStandardRelease assembleFdroidRelease
+```
+
+## Verifizierung der Signatur
+
+Um zu prüfen, ob dein lokaler Build die gleiche Signatur wie die Release-Builds hat:
+
+```bash
+# Signatur von lokalem Build anzeigen
+keytool -printcert -jarfile app/build/outputs/apk/standard/release/app-standard-universal-release.apk
+
+# Signatur von GitHub Release-APK anzeigen (zum Vergleich)
+keytool -printcert -jarfile ~/Downloads/simple-notes-sync-v1.1.0-standard-universal.apk
+```
+
+Die **SHA256** Fingerprints müssen **identisch** sein!
+
+## Troubleshooting
+
+### ❌ Build schlägt fehl: "Keystore not found"
+
+**Problem:** `key.properties` oder Keystore-Datei fehlt
+
+**Lösung:** 
+1. Prüfe, ob `key.properties` existiert: `ls -la key.properties`
+2. Prüfe, ob der Keystore existiert: `ls -la app/simple-notes-release.jks`
+
+### ❌ "Signature mismatch" beim Update
+
+**Problem:** Der lokale Build verwendet einen anderen Key als die Release-Builds
+
+**Lösung:**
+1. Vergleiche die Signaturen mit `keytool` (siehe oben)
+2. Stelle sicher, dass `key.properties` die **exakten** GitHub Secret-Werte enthält
+3. Deinstalliere die alte Version und installiere die neue (als letzter Ausweg)
+
+### ❌ Build verwendet Debug-Signatur
+
+**Problem:** `build.gradle.kts` findet `key.properties` nicht
+
+**Lösung:**
+```bash
+# Prüfe, ob die Datei im richtigen Verzeichnis liegt
+ls -la android/key.properties  # ✅ Richtig
+ls -la android/app/key.properties  # ❌ Falsch
+```
+
+## Sicherheitshinweise
+
+⚠️ **NIEMALS** diese Dateien committen:
+- `key.properties` (in `.gitignore`)
+- `*.jks` / `*.keystore` (in `.gitignore`)
+
+✅ **Schon in `.gitignore`:**
+```gitignore
+key.properties
+*.jks
+*.keystore
+```
+
+⚠️ Die GitHub Secrets (`KEYSTORE_PASSWORD`, etc.) und die lokale `key.properties` müssen **synchron** bleiben!
+
+## Workflow-Vergleich
+
+### GitHub Actions Build
+```yaml
+- Lädt Keystore aus Base64 Secret
+- Erstellt key.properties aus Secrets
+- Baut mit: ./gradlew assembleStandardRelease
+- ✅ Produktions-signiert
+```
+
+### Lokaler Build
+```bash
+# Mit key.properties konfiguriert:
+./gradlew assembleStandardRelease
+# ✅ Produktions-signiert (gleiche Signatur wie GitHub!)
+
+# Ohne key.properties:
+./gradlew assembleStandardRelease
+# ⚠️ Debug-signiert (inkompatibel mit Releases!)
+```
+
+## Quick Reference
+
+```bash
+# Release-APK bauen (signiert, klein, optimiert)
+./gradlew assembleStandardRelease
+
+# Debug-APK bauen (unsigniert, groß, debuggable)
+./gradlew assembleStandardDebug
+
+# APK per HTTP Server verteilen
+cd app/build/outputs/apk/standard/release
+python3 -m http.server 8892
+```

android/app/build.gradle.kts

@@ -1,6 +1,9 @@
 plugins {
     alias(libs.plugins.android.application)
     alias(libs.plugins.kotlin.android)
+    alias(libs.plugins.kotlin.compose)  // v1.5.0: Jetpack Compose Compiler
+    alias(libs.plugins.ktlint)  // ✅ v1.6.1: Reaktiviert nach Code-Cleanup
+    alias(libs.plugins.detekt)
 }
 
 import java.util.Properties
@@ -17,32 +20,27 @@ android {
         applicationId = "dev.dettmer.simplenotes"
         minSdk = 24
         targetSdk = 36
-        versionCode = 2  // 🔥 F-Droid Release v1.1.0
-        versionName = "1.1.0"  // 🔥 Configurable Sync Interval + About Section
+        versionCode = 18  // 🔧 v1.7.1: Android 9 getForegroundInfo Fix (Issue #15)
+        versionName = "1.7.1"  // 🔧 v1.7.1: Android 9 getForegroundInfo Fix
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
-        
-        // 🔥 NEU: Build Date für About Screen
-        buildConfigField("String", "BUILD_DATE", "\"${getBuildDate()}\"")
     }
     
-    // Enable multiple APKs per ABI for smaller downloads
-    splits {
-        abi {
-            isEnable = true
-            reset()
-            include("armeabi-v7a", "arm64-v8a")
-            isUniversalApk = true  // Also generate universal APK
-        }
+    // Disable Google dependency metadata for F-Droid/IzzyOnDroid compatibility
+    dependenciesInfo {
+        includeInApk = false  // Removes DEPENDENCY_INFO_BLOCK from APK
+        includeInBundle = false  // Also disable for AAB (Google Play)
     }
     
     // Product Flavors for F-Droid and standard builds
+    // Note: APK splits are disabled to ensure single APK output
     flavorDimensions += "distribution"
     productFlavors {
         create("fdroid") {
             dimension = "distribution"
             // F-Droid builds have no proprietary dependencies
             // All dependencies in this project are already FOSS-compatible
+            // No APK splits - F-Droid expects single universal APK
         }
         
         create("standard") {
@@ -69,6 +67,16 @@ android {
     }
 
     buildTypes {
+        debug {
+            // ⚡ v1.3.1: Debug-Builds können parallel zur Release-App installiert werden
+            applicationIdSuffix = ".debug"
+            versionNameSuffix = "-debug"
+            isDebuggable = true
+            
+            // Optionales separates Icon-Label für Debug-Builds
+            resValue("string", "app_name_debug", "Simple Notes (Debug)")
+        }
+        
         release {
             isMinifyEnabled = true
             isShrinkResources = true
@@ -88,8 +96,18 @@ android {
     buildFeatures {
         viewBinding = true
         buildConfig = true  // Enable BuildConfig generation
+        compose = true  // v1.5.0: Jetpack Compose für Settings Redesign
     }
     
+    // v1.7.0: Mock Android framework classes in unit tests (Log, etc.)
+    testOptions {
+        unitTests.isReturnDefaultValues = true
+    }
+    
+    // v1.5.0 Hotfix: Strong Skipping Mode für bessere 120Hz Performance
+    // v1.6.1: Feature ist ab dieser Kotlin/Compose Version bereits Standard
+    // composeCompiler { }
+
     compileOptions {
         sourceCompatibility = JavaVersion.VERSION_11
         targetCompatibility = JavaVersion.VERSION_11
@@ -124,14 +142,55 @@ dependencies {
     // LocalBroadcastManager für UI Refresh
     implementation("androidx.localbroadcastmanager:localbroadcastmanager:1.1.0")
 
+    // SwipeRefreshLayout für Pull-to-Refresh
+    implementation("androidx.swiperefreshlayout:swiperefreshlayout:1.1.0")
+
+    // 🔐 v1.7.0: AndroidX Security Crypto für Backup-Verschlüsselung
+    implementation("androidx.security:security-crypto:1.1.0-alpha06")
+
+    // ═══════════════════════════════════════════════════════════════════════
+    // v1.5.0: Jetpack Compose für Settings Redesign
+    // ═══════════════════════════════════════════════════════════════════════
+    implementation(platform(libs.androidx.compose.bom))
+    implementation(libs.androidx.compose.ui)
+    implementation(libs.androidx.compose.ui.graphics)
+    implementation(libs.androidx.compose.ui.tooling.preview)
+    implementation(libs.androidx.compose.material3)
+    implementation(libs.androidx.compose.material.icons)
+    implementation(libs.androidx.activity.compose)
+    implementation(libs.androidx.navigation.compose)
+    implementation(libs.androidx.lifecycle.runtime.compose)
+    debugImplementation(libs.androidx.compose.ui.tooling)
+
     // Testing (bleiben so)
     testImplementation(libs.junit)
     androidTestImplementation(libs.androidx.junit)
     androidTestImplementation(libs.androidx.espresso.core)
 }
 
-// 🔥 NEU: Helper function für Build Date
-fun getBuildDate(): String {
-    val dateFormat = SimpleDateFormat("yyyy-MM-dd", Locale.US)
-    return dateFormat.format(Date())
+// ✅ v1.6.1: ktlint reaktiviert nach Code-Cleanup
+ktlint {
+    android = true
+    outputToConsole = true
+    ignoreFailures = true  // Parser-Probleme in WebDavSyncService.kt und build.gradle.kts
+    enableExperimentalRules = false
+    
+    filter {
+        exclude("**/generated/**")
+        exclude("**/build/**")
+        // Legacy adapters with ktlint parser issues
+        exclude("**/adapters/NotesAdapter.kt")
+        exclude("**/SettingsActivity.kt")
+    }
+}
+
+// ⚡ v1.3.1: detekt-Konfiguration
+detekt {
+    buildUponDefaultConfig = true
+    allRules = false
+    config.setFrom(files("$rootDir/config/detekt/detekt.yml"))
+    baseline = file("$rootDir/config/detekt/baseline.xml")
+    
+    // Parallel-Verarbeitung für schnellere Checks
+    parallel = true
 }

android/app/proguard-rules.pro

@@ -61,3 +61,7 @@
 
 # Keep your app's data classes
 -keep class dev.dettmer.simplenotes.** { *; }
+
+# v1.7.1: Suppress TextInclusionStrategy warnings on older Android versions
+# This class only exists on API 35+ but Compose handles the fallback gracefully
+-dontwarn android.text.Layout$TextInclusionStrategy

android/app/src/debug/res/drawable/ic_launcher_foreground_debug.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Debug overlay for launcher icon - original icon + red "DEBUG" badge -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- Original foreground icon from mipmap -->
+    <item android:drawable="@mipmap/ic_launcher_foreground" />
+    
+    <!-- Debug Badge: Red circle with "D" in top-right corner -->
+    <item>
+        <inset
+            android:insetLeft="60dp"
+            android:insetTop="10dp"
+            android:insetRight="10dp"
+            android:insetBottom="60dp">
+            <layer-list>
+                <!-- Red circle background -->
+                <item>
+                    <shape android:shape="oval">
+                        <solid android:color="#E53935" />
+                        <size android:width="28dp" android:height="28dp" />
+                    </shape>
+                </item>
+            </layer-list>
+        </inset>
+    </item>
+</layer-list>

android/app/src/debug/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Debug version of adaptive icon with badge -->
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- Different background color for debug (darker/orange tint) -->
+    <background android:drawable="@color/ic_launcher_background_debug"/>
+    <foreground android:drawable="@drawable/ic_launcher_foreground_debug"/>
+    <monochrome android:drawable="@mipmap/ic_launcher_monochrome"/>
+</adaptive-icon>

android/app/src/debug/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Debug version of adaptive icon with badge (round) -->
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- Different background color for debug (darker/orange tint) -->
+    <background android:drawable="@color/ic_launcher_background_debug"/>
+    <foreground android:drawable="@drawable/ic_launcher_foreground_debug"/>
+    <monochrome android:drawable="@mipmap/ic_launcher_monochrome"/>
+</adaptive-icon>

android/app/src/debug/res/values/colors_debug.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Debug version: Orange-tinted background to distinguish from release -->
+    <color name="ic_launcher_background_debug">#FFB74D</color>
+</resources>

android/app/src/main/AndroidManifest.xml

@@ -5,8 +5,6 @@
     <!-- Network & Sync Permissions -->
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
-    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
-    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
     
     <!-- Notifications -->
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
@@ -14,6 +12,11 @@
     <!-- Battery Optimization (for WorkManager background sync) -->
     <uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" />
     
+    <!-- v1.7.1: Foreground Service for Expedited Work (Android 9-11) -->
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <!-- v1.7.1: Foreground Service Type for Android 10+ -->
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_DATA_SYNC" />
+    
     <!-- BOOT Permission - CRITICAL für Auto-Sync nach Neustart! -->
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
 
@@ -24,13 +27,15 @@
         android:fullBackupContent="@xml/backup_rules"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
+        android:localeConfig="@xml/locales_config"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.SimpleNotes"
-        android:usesCleartextTraffic="true"
+        android:networkSecurityConfig="@xml/network_security_config"
         tools:targetApi="31">
+        <!-- MainActivity v1.5.0 (Jetpack Compose) - Launcher -->
         <activity
-            android:name=".MainActivity"
+            android:name=".ui.main.ComposeMainActivity"
             android:exported="true"
             android:theme="@style/Theme.SimpleNotes.Splash">
             <intent-filter>
@@ -39,16 +44,35 @@
             </intent-filter>
         </activity>
 
-        <!-- Editor Activity -->
+        <!-- Legacy MainActivity (XML-based) - kept for reference -->
+        <activity
+            android:name=".MainActivity"
+            android:exported="false"
+            android:theme="@style/Theme.SimpleNotes" />
+
+        <!-- Editor Activity (Legacy - XML-based) -->
         <activity
             android:name=".NoteEditorActivity"
             android:windowSoftInputMode="adjustResize"
-            android:parentActivityName=".MainActivity" />
+            android:parentActivityName=".ui.main.ComposeMainActivity" />
 
-        <!-- Settings Activity -->
+        <!-- Editor Activity v1.5.0 (Jetpack Compose) -->
+        <activity
+            android:name=".ui.editor.ComposeNoteEditorActivity"
+            android:windowSoftInputMode="adjustResize"
+            android:parentActivityName=".ui.main.ComposeMainActivity"
+            android:theme="@style/Theme.SimpleNotes" />
+
+        <!-- Settings Activity (Legacy - XML-based) -->
         <activity
             android:name=".SettingsActivity"
-            android:parentActivityName=".MainActivity" />
+            android:parentActivityName=".ui.main.ComposeMainActivity" />
+
+        <!-- Settings Activity v1.5.0 (Jetpack Compose) -->
+        <activity
+            android:name=".ui.settings.ComposeSettingsActivity"
+            android:parentActivityName=".ui.main.ComposeMainActivity"
+            android:theme="@style/Theme.SimpleNotes" />
 
         <!-- Boot Receiver - Startet WorkManager nach Reboot -->
         <receiver
@@ -72,6 +96,12 @@
                 android:resource="@xml/file_paths" />
         </provider>
 
+        <!-- v1.7.1: WorkManager SystemForegroundService for Expedited Work -->
+        <service
+            android:name="androidx.work.impl.foreground.SystemForegroundService"
+            android:foregroundServiceType="dataSync"
+            tools:node="merge" />
+
     </application>
 
 </manifest>

android/app/src/main/java/dev/dettmer/simplenotes/MainActivity.kt

@@ -1,3 +1,5 @@
+@file:Suppress("DEPRECATION") // Legacy code using LocalBroadcastManager, will be removed in v2.0.0
+
 package dev.dettmer.simplenotes
 
 import android.Manifest
@@ -21,30 +23,59 @@ import com.google.android.material.color.DynamicColors
 import com.google.android.material.floatingactionbutton.FloatingActionButton
 import com.google.android.material.snackbar.Snackbar
 import com.google.android.material.card.MaterialCardView
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import dev.dettmer.simplenotes.adapters.NotesAdapter
+import dev.dettmer.simplenotes.models.Note
 import dev.dettmer.simplenotes.storage.NotesStorage
 import dev.dettmer.simplenotes.sync.SyncWorker
 import dev.dettmer.simplenotes.utils.NotificationHelper
 import dev.dettmer.simplenotes.utils.showToast
 import dev.dettmer.simplenotes.utils.Constants
 import android.widget.TextView
+import android.widget.CheckBox
+import android.widget.Toast
+import androidx.lifecycle.lifecycleScope
+import kotlinx.coroutines.launch
 import androidx.lifecycle.lifecycleScope
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import dev.dettmer.simplenotes.sync.WebDavSyncService
+import dev.dettmer.simplenotes.sync.SyncStateManager
 import androidx.core.splashscreen.SplashScreen.Companion.installSplashScreen
+import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
+import android.view.View
+import android.widget.LinearLayout
+import android.view.Gravity
+import android.widget.PopupMenu
+import dev.dettmer.simplenotes.models.NoteType
 
+/**
+ * Legacy MainActivity - DEPRECATED seit v1.5.0, wird entfernt in v2.0.0
+ * Ersetzt durch ComposeMainActivity
+ */
+@Suppress("DEPRECATION") // Legacy code using LocalBroadcastManager, will be removed in v2.0.0
 class MainActivity : AppCompatActivity() {
     
     private lateinit var recyclerViewNotes: RecyclerView
     private lateinit var emptyStateCard: MaterialCardView
     private lateinit var fabAddNote: FloatingActionButton
     private lateinit var toolbar: MaterialToolbar
+    private lateinit var swipeRefreshLayout: SwipeRefreshLayout
+    
+    // 🔄 v1.3.1: Sync Status Banner
+    private lateinit var syncStatusBanner: LinearLayout
+    private lateinit var syncStatusText: TextView
     
     private lateinit var adapter: NotesAdapter
     private val storage by lazy { NotesStorage(this) }
     
+    // Menu reference for sync button state
+    private var optionsMenu: Menu? = null
+    
+    // Track pending deletions to prevent flicker when notes reload
+    private val pendingDeletions = mutableSetOf<String>()
+    
     private val prefs by lazy {
         getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)
     }
@@ -55,6 +86,8 @@ class MainActivity : AppCompatActivity() {
         private const val REQUEST_SETTINGS = 1002
         private const val MIN_AUTO_SYNC_INTERVAL_MS = 60_000L // 1 Minute
         private const val PREF_LAST_AUTO_SYNC_TIME = "last_auto_sync_timestamp"
+        private const val SYNC_COMPLETED_DELAY_MS = 1500L
+        private const val ERROR_DISPLAY_DELAY_MS = 3000L
     }
     
     /**
@@ -86,22 +119,96 @@ class MainActivity : AppCompatActivity() {
         
         setContentView(R.layout.activity_main)
         
-        // File Logging aktivieren wenn eingestellt
-        if (prefs.getBoolean("file_logging_enabled", false)) {
-            Logger.enableFileLogging(this)
+        // Logger initialisieren und File-Logging aktivieren wenn eingestellt
+        Logger.init(this)
+        if (prefs.getBoolean(Constants.KEY_FILE_LOGGING_ENABLED, false)) {
+            Logger.setFileLoggingEnabled(true)
         }
         
+        // Alte Sync-Notifications beim App-Start löschen
+        NotificationHelper.clearSyncNotifications(this)
+        
         // Permission für Notifications (Android 13+)
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
             requestNotificationPermission()
         }
         
+        // 🌍 v1.7.2: Debug Locale für Fehlersuche
+        logLocaleInfo()
+        
         findViews()
         setupToolbar()
         setupRecyclerView()
         setupFab()
         
+        // v1.4.1: Migrate checklists for backwards compatibility
+        migrateChecklistsForBackwardsCompat()
+        
         loadNotes()
+        
+        // 🔄 v1.3.1: Observe sync state for UI updates
+        setupSyncStateObserver()
+    }
+    
+    /**
+     * 🔄 v1.3.1: Beobachtet Sync-Status für UI-Feedback
+     */
+    private fun setupSyncStateObserver() {
+        SyncStateManager.syncStatus.observe(this) { status ->
+            when (status.state) {
+                SyncStateManager.SyncState.SYNCING -> {
+                    // Disable sync controls
+                    setSyncControlsEnabled(false)
+                    // 🔄 v1.3.1: Show sync status banner (ersetzt SwipeRefresh-Animation)
+                    syncStatusText.text = getString(R.string.sync_status_syncing)
+                    syncStatusBanner.visibility = View.VISIBLE
+                }
+                SyncStateManager.SyncState.COMPLETED -> {
+                    // Re-enable sync controls
+                    setSyncControlsEnabled(true)
+                    swipeRefreshLayout.isRefreshing = false
+                    // Show completed briefly, then hide
+                    syncStatusText.text = status.message ?: getString(R.string.sync_status_completed)
+                    lifecycleScope.launch {
+                        kotlinx.coroutines.delay(SYNC_COMPLETED_DELAY_MS)
+                        syncStatusBanner.visibility = View.GONE
+                        SyncStateManager.reset()
+                    }
+                }
+                SyncStateManager.SyncState.ERROR -> {
+                    // Re-enable sync controls
+                    setSyncControlsEnabled(true)
+                    swipeRefreshLayout.isRefreshing = false
+                    // Show error briefly, then hide
+                    syncStatusText.text = status.message ?: getString(R.string.sync_status_error)
+                    lifecycleScope.launch {
+                        kotlinx.coroutines.delay(ERROR_DISPLAY_DELAY_MS)
+                        syncStatusBanner.visibility = View.GONE
+                        SyncStateManager.reset()
+                    }
+                }
+                SyncStateManager.SyncState.IDLE -> {
+                    setSyncControlsEnabled(true)
+                    swipeRefreshLayout.isRefreshing = false
+                    syncStatusBanner.visibility = View.GONE
+                }
+                // v1.5.0: Silent-Sync - Banner nicht anzeigen, aber Sync-Controls deaktivieren
+                SyncStateManager.SyncState.SYNCING_SILENT -> {
+                    setSyncControlsEnabled(false)
+                    // Kein Banner anzeigen bei Silent-Sync (z.B. onResume Auto-Sync)
+                }
+            }
+        }
+    }
+    
+    /**
+     * 🔄 v1.3.1: Aktiviert/deaktiviert Sync-Controls (Button + SwipeRefresh)
+     */
+    private fun setSyncControlsEnabled(enabled: Boolean) {
+        // Menu Sync-Button
+        optionsMenu?.findItem(R.id.action_sync)?.isEnabled = enabled
+        // SwipeRefresh
+        swipeRefreshLayout.isEnabled = enabled
     }
     
     override fun onResume() {
@@ -117,7 +224,7 @@ class MainActivity : AppCompatActivity() {
         
         Logger.d(TAG, "📡 BroadcastReceiver registered (sync-completed)")
         
-        // Reload notes
+        // Reload notes (scroll to top wird in loadNotes() gemacht)
         loadNotes()
         
         // Trigger Auto-Sync beim App-Wechsel in Vordergrund (Toast)
@@ -130,6 +237,7 @@ class MainActivity : AppCompatActivity() {
      * - Nur Success-Toast (kein "Auto-Sync..." Toast)
      * 
      * NOTE: WiFi-Connect Sync nutzt WorkManager (auch wenn App geschlossen!)
+     * v1.5.0: Silent-Sync - kein Banner während des Syncs, Fehler werden trotzdem angezeigt
      */
     private fun triggerAutoSync(source: String = "unknown") {
         // Throttling: Max 1 Sync pro Minute
@@ -137,15 +245,41 @@ class MainActivity : AppCompatActivity() {
             return
         }
         
+        // 🔄 v1.3.1: Check if sync already running
+        // v1.5.0: silent=true - kein Banner bei Auto-Sync
+        if (!SyncStateManager.tryStartSync("auto-$source", silent = true)) {
+            Logger.d(TAG, "⏭️ Auto-sync ($source): Another sync already in progress")
+            return
+        }
+        
         Logger.d(TAG, "🔄 Auto-sync triggered ($source)")
         
         // Update last sync timestamp
         prefs.edit().putLong(PREF_LAST_AUTO_SYNC_TIME, System.currentTimeMillis()).apply()
         
-        // GLEICHER Sync-Code wie manueller Sync (funktioniert!)
         lifecycleScope.launch {
             try {
                 val syncService = WebDavSyncService(this@MainActivity)
+                
+                // 🔥 v1.1.2: Check if there are unsynced changes first (performance optimization)
+                if (!syncService.hasUnsyncedChanges()) {
+                    Logger.d(TAG, "⏭️ Auto-sync ($source): No unsynced changes - skipping")
+                    SyncStateManager.reset()
+                    return@launch
+                }
+                
+                // ⭐ WICHTIG: Server-Erreichbarkeits-Check VOR Sync (wie in SyncWorker)
+                val isReachable = withContext(Dispatchers.IO) {
+                    syncService.isServerReachable()
+                }
+                
+                if (!isReachable) {
+                    Logger.d(TAG, "⏭️ Auto-sync ($source): Server not reachable - skipping silently")
+                    SyncStateManager.reset()
+                    return@launch
+                }
+                
+                // Server ist erreichbar → Sync durchführen
                 val result = withContext(Dispatchers.IO) {
                     syncService.syncNotes()
                 }
@@ -153,6 +287,7 @@ class MainActivity : AppCompatActivity() {
                 // Feedback abhängig von Source
                 if (result.isSuccess && result.syncedCount > 0) {
                     Logger.d(TAG, "✅ Auto-sync successful ($source): ${result.syncedCount} notes")
+                    SyncStateManager.markCompleted("${result.syncedCount} Notizen")
                     
                     // onResume: Nur Success-Toast
                     showToast("✅ Gesynct: ${result.syncedCount} Notizen")
@@ -160,14 +295,17 @@ class MainActivity : AppCompatActivity() {
                     
                 } else if (result.isSuccess) {
                     Logger.d(TAG, "ℹ️ Auto-sync ($source): No changes")
+                    SyncStateManager.markCompleted()
                     
                 } else {
                     Logger.e(TAG, "❌ Auto-sync failed ($source): ${result.errorMessage}")
+                    SyncStateManager.markError(result.errorMessage)
                     // Kein Toast - App ist im Hintergrund
                 }
                 
             } catch (e: Exception) {
                 Logger.e(TAG, "💥 Auto-sync exception ($source): ${e.message}")
+                SyncStateManager.markError(e.message)
                 // Kein Toast - App ist im Hintergrund
             }
         }
@@ -203,6 +341,11 @@ class MainActivity : AppCompatActivity() {
         emptyStateCard = findViewById(R.id.emptyStateCard)
         fabAddNote = findViewById(R.id.fabAddNote)
         toolbar = findViewById(R.id.toolbar)
+        swipeRefreshLayout = findViewById<SwipeRefreshLayout>(R.id.swipeRefreshLayout)
+        
+        // 🔄 v1.3.1: Sync Status Banner
+        syncStatusBanner = findViewById(R.id.syncStatusBanner)
+        syncStatusText = findViewById(R.id.syncStatusText)
     }
     
     private fun setupToolbar() {
@@ -216,10 +359,74 @@ class MainActivity : AppCompatActivity() {
         recyclerViewNotes.adapter = adapter
         recyclerViewNotes.layoutManager = LinearLayoutManager(this)
         
+        // 🔥 v1.1.2: Setup Pull-to-Refresh
+        setupPullToRefresh()
+        
         // Setup Swipe-to-Delete
         setupSwipeToDelete()
     }
     
+    /**
+     * Setup Pull-to-Refresh für manuellen Sync (v1.1.2)
+     */
+    private fun setupPullToRefresh() {
+        swipeRefreshLayout.setOnRefreshListener {
+            Logger.d(TAG, "🔄 Pull-to-Refresh triggered - starting manual sync")
+            
+            // 🔄 v1.3.1: Check if sync already running (Banner zeigt Status)
+            if (!SyncStateManager.tryStartSync("pullToRefresh")) {
+                swipeRefreshLayout.isRefreshing = false
+                return@setOnRefreshListener
+            }
+            
+            lifecycleScope.launch {
+                try {
+                    val prefs = getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)
+                    val serverUrl = prefs.getString(Constants.KEY_SERVER_URL, null)
+                    
+                    if (serverUrl.isNullOrEmpty()) {
+                        showToast("⚠️ Server noch nicht konfiguriert")
+                        SyncStateManager.reset()
+                        return@launch
+                    }
+                    
+                    val syncService = WebDavSyncService(this@MainActivity)
+                    
+                    // 🔥 v1.1.2: Check if there are unsynced changes first (performance optimization)
+                    if (!syncService.hasUnsyncedChanges()) {
+                        Logger.d(TAG, "⏭️ No unsynced changes, skipping server reachability check")
+                        SyncStateManager.markCompleted(getString(R.string.snackbar_already_synced))
+                        return@launch
+                    }
+                    
+                    // Check if server is reachable
+                    if (!syncService.isServerReachable()) {
+                        SyncStateManager.markError(getString(R.string.snackbar_server_unreachable))
+                        return@launch
+                    }
+                    
+                    // Perform sync
+                    val result = syncService.syncNotes()
+                    
+                    if (result.isSuccess) {
+                        SyncStateManager.markCompleted(getString(R.string.snackbar_synced_count, result.syncedCount))
+                        loadNotes()
+                    } else {
+                        SyncStateManager.markError(result.errorMessage)
+                    }
+                } catch (e: Exception) {
+                    Logger.e(TAG, "Pull-to-Refresh sync failed", e)
+                    SyncStateManager.markError(e.message)
+                }
+            }
+        }
+        
+        // Set Material 3 color scheme
+        swipeRefreshLayout.setColorSchemeResources(
+            com.google.android.material.R.color.material_dynamic_primary50
+        )
+    }
+    
     private fun setupSwipeToDelete() {
         val itemTouchHelper = ItemTouchHelper(object : ItemTouchHelper.SimpleCallback(
             0, // No drag
@@ -232,31 +439,20 @@ class MainActivity : AppCompatActivity() {
             ): Boolean = false
             
             override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
-                val position = viewHolder.adapterPosition
-                val note = adapter.currentList[position]
-                val notesCopy = adapter.currentList.toMutableList()
+                val position = viewHolder.bindingAdapterPosition
+                val swipedNote = adapter.currentList[position]
                 
-                // Remove from list immediately for visual feedback
-                notesCopy.removeAt(position)
-                adapter.submitList(notesCopy)
+                // Store original list BEFORE removing note
+                val originalList = adapter.currentList.toList()
                 
-                // Show Snackbar with UNDO
-                Snackbar.make(
-                    recyclerViewNotes,
-                    "Notiz gelöscht",
-                    Snackbar.LENGTH_LONG
-                ).setAction("RÜCKGÄNGIG") {
-                    // UNDO: Restore note in list
-                    loadNotes()
-                }.addCallback(object : Snackbar.Callback() {
-                    override fun onDismissed(transientBottomBar: Snackbar?, event: Int) {
-                        if (event != DISMISS_EVENT_ACTION) {
-                            // Snackbar dismissed without UNDO → Actually delete the note
-                            storage.deleteNote(note.id)
-                            loadNotes()
+                // Remove from list for visual feedback (NOT from storage yet!)
+                val listWithoutNote = originalList.toMutableList().apply {
+                    removeAt(position)
                 }
-                    }
-                }).show()
+                adapter.submitList(listWithoutNote)
+                
+                // Show dialog with ability to restore
+                showServerDeletionDialog(swipedNote, originalList)
             }
             
             override fun getSwipeThreshold(viewHolder: RecyclerView.ViewHolder): Float {
@@ -268,18 +464,182 @@ class MainActivity : AppCompatActivity() {
         itemTouchHelper.attachToRecyclerView(recyclerViewNotes)
     }
     
-    private fun setupFab() {
-        fabAddNote.setOnClickListener {
-            openNoteEditor(null)
+    private fun showServerDeletionDialog(note: Note, originalList: List<Note>) {
+        val alwaysDeleteFromServer = prefs.getBoolean(Constants.KEY_ALWAYS_DELETE_FROM_SERVER, false)
+        
+        if (alwaysDeleteFromServer) {
+            // Auto-delete from server without asking
+            deleteNoteLocally(note, deleteFromServer = true)
+            return
         }
+        
+        val dialogView = layoutInflater.inflate(R.layout.dialog_server_deletion, null)
+        val checkboxAlways = dialogView.findViewById<CheckBox>(R.id.checkboxAlwaysDeleteFromServer)
+        
+        MaterialAlertDialogBuilder(this)
+            .setTitle(getString(R.string.legacy_delete_dialog_title))
+            .setMessage(getString(R.string.legacy_delete_dialog_message, note.title))
+            .setView(dialogView)
+            .setNeutralButton(getString(R.string.cancel)) { _, _ ->
+                // RESTORE: Re-submit original list (note is NOT deleted from storage)
+                adapter.submitList(originalList)
+            }
+            .setOnCancelListener {
+                // User pressed back - also restore
+                adapter.submitList(originalList)
+            }
+            .setPositiveButton("Nur lokal") { _, _ ->
+                if (checkboxAlways.isChecked) {
+                    prefs.edit().putBoolean(Constants.KEY_ALWAYS_DELETE_FROM_SERVER, false).apply()
+                }
+                // NOW actually delete from storage
+                deleteNoteLocally(note, deleteFromServer = false)
+            }
+            .setNegativeButton(getString(R.string.legacy_delete_from_server)) { _, _ ->
+                if (checkboxAlways.isChecked) {
+                    prefs.edit().putBoolean(Constants.KEY_ALWAYS_DELETE_FROM_SERVER, true).apply()
+                }
+                deleteNoteLocally(note, deleteFromServer = true)
+            }
+            .setCancelable(true)
+            .show()
+    }
+    
+    private fun deleteNoteLocally(note: Note, deleteFromServer: Boolean) {
+        // Track pending deletion to prevent flicker
+        pendingDeletions.add(note.id)
+        
+        // Delete from storage
+        storage.deleteNote(note.id)
+        
+        // Reload to reflect changes
+        loadNotes()
+        
+        // Show Snackbar with UNDO option
+        val message = if (deleteFromServer) {
+            getString(R.string.legacy_delete_with_server, note.title)
+        } else {
+            getString(R.string.legacy_delete_local_only, note.title)
+        }
+        
+        Snackbar.make(recyclerViewNotes, message, Snackbar.LENGTH_LONG)
+            .setAction(getString(R.string.snackbar_undo)) {
+                // UNDO: Restore note
+                storage.saveNote(note)
+                pendingDeletions.remove(note.id)
+                loadNotes()
+            }
+            .addCallback(object : Snackbar.Callback() {
+                override fun onDismissed(transientBottomBar: Snackbar?, event: Int) {
+                    if (event != DISMISS_EVENT_ACTION) {
+                        // Snackbar dismissed without UNDO
+                        pendingDeletions.remove(note.id)
+                        
+                        // Delete from server if requested
+                        if (deleteFromServer) {
+                            lifecycleScope.launch {
+                                try {
+                                    val webdavService = WebDavSyncService(this@MainActivity)
+                                    val success = webdavService.deleteNoteFromServer(note.id)
+                                    if (success) {
+                                        runOnUiThread {
+                                            Toast.makeText(
+                                                this@MainActivity,
+                                                getString(R.string.snackbar_deleted_from_server),
+                                                Toast.LENGTH_SHORT
+                                            ).show()
+                                        }
+                                    } else {
+                                        runOnUiThread {
+                                            Toast.makeText(
+                                                this@MainActivity,
+                                                getString(R.string.snackbar_server_delete_failed),
+                                                Toast.LENGTH_LONG
+                                            ).show()
+                                        }
+                                    }
+                                } catch (e: Exception) {
+                                    runOnUiThread {
+                                        Toast.makeText(
+                                            this@MainActivity,
+                                            "Server-Fehler: ${e.message}",
+                                            Toast.LENGTH_LONG
+                                        ).show()
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }).show()
+    }
+    
+    /**
+     * v1.4.0: Setup FAB mit Dropdown für Notiz-Typ Auswahl
+     */
+    private fun setupFab() {
+        fabAddNote.setOnClickListener { view ->
+            showNoteTypePopup(view)
+        }
+    }
+    
+    /**
+     * v1.4.0: Zeigt Popup-Menü zur Auswahl des Notiz-Typs
+     */
+    private fun showNoteTypePopup(anchor: View) {
+        val popupMenu = PopupMenu(this, anchor, Gravity.END)
+        popupMenu.inflate(R.menu.menu_fab_note_types)
+        
+        // Icons im Popup anzeigen (via Reflection, da standardmäßig ausgeblendet)
+        try {
+            val fields = popupMenu.javaClass.declaredFields
+            for (field in fields) {
+                if ("mPopup" == field.name) {
+                    field.isAccessible = true
+                    val menuPopupHelper = field.get(popupMenu)
+                    val classPopupHelper = Class.forName(menuPopupHelper.javaClass.name)
+                    val setForceIcons = classPopupHelper.getMethod("setForceShowIcon", Boolean::class.java)
+                    setForceIcons.invoke(menuPopupHelper, true)
+                    break
+                }
+            }
+        } catch (e: Exception) {
+            Logger.w(TAG, "Could not force show icons in popup menu: ${e.message}")
+        }
+        
+        popupMenu.setOnMenuItemClickListener { menuItem ->
+            val noteType = when (menuItem.itemId) {
+                R.id.action_create_text_note -> NoteType.TEXT
+                R.id.action_create_checklist -> NoteType.CHECKLIST
+                else -> return@setOnMenuItemClickListener false
+            }
+            
+            val intent = Intent(this, NoteEditorActivity::class.java)
+            intent.putExtra(NoteEditorActivity.EXTRA_NOTE_TYPE, noteType.name)
+            startActivity(intent)
+            true
+        }
+        
+        popupMenu.show()
     }
     
     private fun loadNotes() {
         val notes = storage.loadAllNotes()
-        adapter.submitList(notes)
+        
+        // Filter out notes that are pending deletion (prevent flicker)
+        val filteredNotes = notes.filter { it.id !in pendingDeletions }
+        
+        // Submit list with callback to scroll to top after list is updated
+        adapter.submitList(filteredNotes) {
+            // Scroll to top after list update is complete
+            // Wichtig: Nach dem Erstellen/Bearbeiten einer Notiz
+            if (filteredNotes.isNotEmpty()) {
+                recyclerViewNotes.scrollToPosition(0)
+            }
+        }
         
         // Material 3 Empty State Card
-        emptyStateCard.visibility = if (notes.isEmpty()) {
+        emptyStateCard.visibility = if (filteredNotes.isEmpty()) {
             android.view.View.VISIBLE
         } else {
             android.view.View.GONE
@@ -295,38 +655,64 @@ class MainActivity : AppCompatActivity() {
     }
     
     private fun openSettings() {
-        val intent = Intent(this, SettingsActivity::class.java)
+        // v1.5.0: Use new Jetpack Compose Settings
+        val intent = Intent(this, dev.dettmer.simplenotes.ui.settings.ComposeSettingsActivity::class.java)
         @Suppress("DEPRECATION")
         startActivityForResult(intent, REQUEST_SETTINGS)
     }
     
     private fun triggerManualSync() {
+        // 🔄 v1.3.1: Check if sync already running (Banner zeigt Status)
+        if (!SyncStateManager.tryStartSync("manual")) {
+            return
+        }
+        
         lifecycleScope.launch {
             try {
-                showToast("Starte Synchronisation...")
-                
-                // Start sync
+                // Create sync service
                 val syncService = WebDavSyncService(this@MainActivity)
+                
+                // 🔥 v1.1.2: Check if there are unsynced changes first (performance optimization)
+                if (!syncService.hasUnsyncedChanges()) {
+                    Logger.d(TAG, "⏭️ Manual Sync: No unsynced changes - skipping")
+                    val message = getString(R.string.toast_already_synced)
+                    SyncStateManager.markCompleted(message)
+                    return@launch
+                }
+                
+                // ⭐ WICHTIG: Server-Erreichbarkeits-Check VOR Sync (wie in SyncWorker)
+                val isReachable = withContext(Dispatchers.IO) {
+                    syncService.isServerReachable()
+                }
+                
+                if (!isReachable) {
+                    Logger.d(TAG, "⏭️ Manual Sync: Server not reachable - aborting")
+                    SyncStateManager.markError(getString(R.string.snackbar_server_unreachable))
+                    return@launch
+                }
+                
+                // Server ist erreichbar → Sync durchführen
                 val result = withContext(Dispatchers.IO) {
                     syncService.syncNotes()
                 }
                 
                 // Show result
                 if (result.isSuccess) {
-                    showToast("Sync erfolgreich: ${result.syncedCount} Notizen")
+                    SyncStateManager.markCompleted("${result.syncedCount} Notizen")
                     loadNotes() // Reload notes
                 } else {
-                    showToast("Sync Fehler: ${result.errorMessage}")
+                    SyncStateManager.markError(result.errorMessage)
                 }
                 
             } catch (e: Exception) {
-                showToast("Sync Fehler: ${e.message}")
+                SyncStateManager.markError(e.message)
             }
         }
     }
     
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
         menuInflater.inflate(R.menu.menu_main, menu)
+        optionsMenu = menu  // 🔄 v1.3.1: Store reference for sync button state
         return true
     }
     
@@ -366,6 +752,54 @@ class MainActivity : AppCompatActivity() {
         }
     }
     
+    /**
+     * v1.4.1: Migriert bestehende Checklisten für Abwärtskompatibilität.
+     * 
+     * Problem: v1.4.0 Checklisten haben leeren "content", was auf älteren
+     * App-Versionen (v1.3.x) als leere Notiz angezeigt wird.
+     * 
+     * Lösung: Alle Checklisten ohne Fallback-Content als PENDING markieren,
+     * damit sie beim nächsten Sync mit Fallback-Content hochgeladen werden.
+     * 
+     * TODO: Diese Migration kann entfernt werden, sobald v1.4.0 nicht mehr
+     * im Umlauf ist (ca. 6 Monate nach v1.4.1 Release, also ~Juli 2026).
+     * Tracking: https://github.com/inventory69/simple-notes-sync/issues/XXX
+     */
+    private fun migrateChecklistsForBackwardsCompat() {
+        val migrationKey = "v1.4.1_checklist_migration_done"
+        
+        // Nur einmal ausführen
+        if (prefs.getBoolean(migrationKey, false)) {
+            return
+        }
+        
+        val allNotes = storage.loadAllNotes()
+        val checklistsToMigrate = allNotes.filter { note ->
+            note.noteType == NoteType.CHECKLIST && 
+            note.content.isBlank() &&
+            note.checklistItems?.isNotEmpty() == true
+        }
+        
+        if (checklistsToMigrate.isNotEmpty()) {
+            Logger.d(TAG, "🔄 v1.4.1 Migration: Found ${checklistsToMigrate.size} checklists without fallback content")
+            
+            for (note in checklistsToMigrate) {
+                // Als PENDING markieren, damit beim nächsten Sync der Fallback-Content 
+                // generiert und hochgeladen wird
+                val updatedNote = note.copy(
+                    syncStatus = dev.dettmer.simplenotes.models.SyncStatus.PENDING
+                )
+                storage.saveNote(updatedNote)
+                Logger.d(TAG, "   📝 Marked for re-sync: ${note.title}")
+            }
+            
+            Logger.d(TAG, "✅ v1.4.1 Migration: ${checklistsToMigrate.size} checklists marked for re-sync")
+        }
+        
+        // Migration als erledigt markieren
+        prefs.edit().putBoolean(migrationKey, true).apply()
+    }
+    
     override fun onRequestPermissionsResult(
         requestCode: Int,
         permissions: Array<out String>,
@@ -377,12 +811,46 @@ class MainActivity : AppCompatActivity() {
             REQUEST_NOTIFICATION_PERMISSION -> {
                 if (grantResults.isNotEmpty() && 
                     grantResults[0] == PackageManager.PERMISSION_GRANTED) {
-                    showToast("Benachrichtigungen aktiviert")
+                    showToast(getString(R.string.toast_notifications_enabled))
                 } else {
-                    showToast("Benachrichtigungen deaktiviert. " +
-                        "Du kannst sie in den Einstellungen aktivieren.")
+                    showToast(getString(R.string.toast_notifications_disabled))
                 }
             }
         }
     }
+    
+    /**
+     * 🌍 v1.7.2: Debug-Logging für Locale-Problem
+     * Hilft zu identifizieren warum deutsche Strings trotz englischer App angezeigt werden
+     */
+    private fun logLocaleInfo() {
+        if (!BuildConfig.DEBUG) return
+        
+        Logger.d(TAG, "╔═══════════════════════════════════════════════════")
+        Logger.d(TAG, "║ 🌍 LOCALE DEBUG INFO")
+        Logger.d(TAG, "╠═══════════════════════════════════════════════════")
+        
+        // System Locale
+        val systemLocale = java.util.Locale.getDefault()
+        Logger.d(TAG, "║ System Locale (Locale.getDefault()): $systemLocale")
+        
+        // Resources Locale
+        val resourcesLocale = resources.configuration.locales[0]
+        Logger.d(TAG, "║ Resources Locale: $resourcesLocale")
+        
+        // Context Locale (API 24+)
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            val contextLocales = resources.configuration.locales
+            Logger.d(TAG, "║ Context Locales (all): $contextLocales")
+        }
+        
+        // Test String Loading
+        val testString = getString(R.string.toast_already_synced)
+        Logger.d(TAG, "║ Test: getString(R.string.toast_already_synced)")
+        Logger.d(TAG, "║ Result: '$testString'")
+        Logger.d(TAG, "║ Expected EN: '✅ Already synced'")
+        Logger.d(TAG, "║ Is German?: ${testString.contains("Bereits") || testString.contains("synchronisiert")}")
+        
+        Logger.d(TAG, "╚═══════════════════════════════════════════════════")
+    }
 }

android/app/src/main/java/dev/dettmer/simplenotes/NoteEditorActivity.kt

@@ -3,27 +3,58 @@ package dev.dettmer.simplenotes
 import android.os.Bundle
 import android.view.Menu
 import android.view.MenuItem
+import android.view.View
+import android.widget.LinearLayout
 import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatActivity
+import androidx.recyclerview.widget.ItemTouchHelper
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
 import com.google.android.material.appbar.MaterialToolbar
+import com.google.android.material.button.MaterialButton
 import com.google.android.material.color.DynamicColors
 import com.google.android.material.textfield.TextInputEditText
+import com.google.android.material.textfield.TextInputLayout
+import dev.dettmer.simplenotes.adapters.ChecklistEditorAdapter
+import dev.dettmer.simplenotes.models.ChecklistItem
 import dev.dettmer.simplenotes.models.Note
+import dev.dettmer.simplenotes.models.NoteType
 import dev.dettmer.simplenotes.models.SyncStatus
 import dev.dettmer.simplenotes.storage.NotesStorage
 import dev.dettmer.simplenotes.utils.DeviceIdGenerator
+import dev.dettmer.simplenotes.utils.Logger
 import dev.dettmer.simplenotes.utils.showToast
 
+/**
+ * Editor Activity für Notizen und Checklisten
+ * 
+ * v1.4.0: Unterstützt jetzt sowohl TEXT als auch CHECKLIST Notizen
+ */
 class NoteEditorActivity : AppCompatActivity() {
     
+    // Views
+    private lateinit var toolbar: MaterialToolbar
+    private lateinit var tilTitle: TextInputLayout
     private lateinit var editTextTitle: TextInputEditText
+    private lateinit var tilContent: TextInputLayout
     private lateinit var editTextContent: TextInputEditText
+    private lateinit var checklistContainer: LinearLayout
+    private lateinit var rvChecklistItems: RecyclerView
+    private lateinit var btnAddItem: MaterialButton
+    
     private lateinit var storage: NotesStorage
     
+    // State
     private var existingNote: Note? = null
+    private var currentNoteType: NoteType = NoteType.TEXT
+    private val checklistItems = mutableListOf<ChecklistItem>()
+    private var checklistAdapter: ChecklistEditorAdapter? = null
+    private var itemTouchHelper: ItemTouchHelper? = null
     
     companion object {
+        private const val TAG = "NoteEditorActivity"
         const val EXTRA_NOTE_ID = "extra_note_id"
+        const val EXTRA_NOTE_TYPE = "extra_note_type"
     }
     
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -36,38 +67,172 @@ class NoteEditorActivity : AppCompatActivity() {
         
         storage = NotesStorage(this)
         
-        // Setup toolbar
-        val toolbar = findViewById<MaterialToolbar>(R.id.toolbar)
-        setSupportActionBar(toolbar)
-        supportActionBar?.apply {
-            setDisplayHomeAsUpEnabled(true)
-            setHomeAsUpIndicator(android.R.drawable.ic_menu_close_clear_cancel)
+        findViews()
+        setupToolbar()
+        loadNoteOrDetermineType()
+        setupUIForNoteType()
     }
     
-        // Find views
+    private fun findViews() {
+        toolbar = findViewById(R.id.toolbar)
+        tilTitle = findViewById(R.id.tilTitle)
         editTextTitle = findViewById(R.id.editTextTitle)
+        tilContent = findViewById(R.id.tilContent)
         editTextContent = findViewById(R.id.editTextContent)
+        checklistContainer = findViewById(R.id.checklistContainer)
+        rvChecklistItems = findViewById(R.id.rvChecklistItems)
+        btnAddItem = findViewById(R.id.btnAddItem)
+    }
     
-        // Load existing note if editing
+    private fun setupToolbar() {
+        setSupportActionBar(toolbar)
+        supportActionBar?.setDisplayHomeAsUpEnabled(true)
+    }
+    
+    private fun loadNoteOrDetermineType() {
         val noteId = intent.getStringExtra(EXTRA_NOTE_ID)
+        
         if (noteId != null) {
+            // Existierende Notiz laden
             existingNote = storage.loadNote(noteId)
-            existingNote?.let {
-                editTextTitle.setText(it.title)
-                editTextContent.setText(it.content)
-                supportActionBar?.title = "Notiz bearbeiten"
+            existingNote?.let { note ->
+                editTextTitle.setText(note.title)
+                currentNoteType = note.noteType
+                
+                when (note.noteType) {
+                    NoteType.TEXT -> {
+                        editTextContent.setText(note.content)
+                        supportActionBar?.title = getString(R.string.edit_note)
+                    }
+                    NoteType.CHECKLIST -> {
+                        note.checklistItems?.let { items ->
+                            checklistItems.clear()
+                            checklistItems.addAll(items.sortedBy { it.order })
+                        }
+                        supportActionBar?.title = getString(R.string.edit_checklist)
+                    }
+                }
             }
         } else {
-            supportActionBar?.title = "Neue Notiz"
+            // Neue Notiz - Typ aus Intent
+            val typeString = intent.getStringExtra(EXTRA_NOTE_TYPE) ?: NoteType.TEXT.name
+            currentNoteType = try {
+                NoteType.valueOf(typeString)
+            } catch (e: IllegalArgumentException) {
+                Logger.w(TAG, "Invalid note type '$typeString', defaulting to TEXT: ${e.message}")
+                NoteType.TEXT
+            }
+            
+            when (currentNoteType) {
+                NoteType.TEXT -> {
+                    supportActionBar?.title = getString(R.string.new_note)
+                }
+                NoteType.CHECKLIST -> {
+                    supportActionBar?.title = getString(R.string.new_checklist)
+                    // Erstes leeres Item hinzufügen
+                    checklistItems.add(ChecklistItem.createEmpty(0))
+                }
+            }
+        }
+    }
+    
+    private fun setupUIForNoteType() {
+        when (currentNoteType) {
+            NoteType.TEXT -> {
+                tilContent.visibility = View.VISIBLE
+                checklistContainer.visibility = View.GONE
+            }
+            NoteType.CHECKLIST -> {
+                tilContent.visibility = View.GONE
+                checklistContainer.visibility = View.VISIBLE
+                setupChecklistRecyclerView()
+            }
+        }
+    }
+    
+    private fun setupChecklistRecyclerView() {
+        checklistAdapter = ChecklistEditorAdapter(
+            items = checklistItems,
+            onItemCheckedChanged = { position, isChecked ->
+                if (position in checklistItems.indices) {
+                    checklistItems[position].isChecked = isChecked
+                }
+            },
+            onItemTextChanged = { position, newText ->
+                if (position in checklistItems.indices) {
+                    checklistItems[position] = checklistItems[position].copy(text = newText)
+                }
+            },
+            onItemDeleted = { position ->
+                deleteChecklistItem(position)
+            },
+            onAddNewItem = { position ->
+                addChecklistItemAt(position)
+            },
+            onStartDrag = { viewHolder ->
+                itemTouchHelper?.startDrag(viewHolder)
+            }
+        )
+        
+        rvChecklistItems.apply {
+            layoutManager = LinearLayoutManager(this@NoteEditorActivity)
+            adapter = checklistAdapter
+        }
+        
+        // Drag & Drop Setup
+        val callback = object : ItemTouchHelper.SimpleCallback(
+            ItemTouchHelper.UP or ItemTouchHelper.DOWN,
+            0 // Kein Swipe
+        ) {
+            override fun onMove(
+                recyclerView: RecyclerView,
+                viewHolder: RecyclerView.ViewHolder,
+                target: RecyclerView.ViewHolder
+            ): Boolean {
+                val from = viewHolder.bindingAdapterPosition
+                val to = target.bindingAdapterPosition
+                checklistAdapter?.moveItem(from, to)
+                return true
+            }
+            
+            override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
+                // Nicht verwendet
+            }
+            
+            override fun isLongPressDragEnabled(): Boolean = false // Nur via Handle
+        }
+        
+        itemTouchHelper = ItemTouchHelper(callback)
+        itemTouchHelper?.attachToRecyclerView(rvChecklistItems)
+        
+        // Add Item Button
+        btnAddItem.setOnClickListener {
+            addChecklistItemAt(checklistItems.size)
+        }
+    }
+    
+    private fun addChecklistItemAt(position: Int) {
+        val newItem = ChecklistItem.createEmpty(position)
+        checklistAdapter?.insertItem(position, newItem)
+        
+        // Zum neuen Item scrollen und fokussieren
+        rvChecklistItems.scrollToPosition(position)
+        checklistAdapter?.focusItem(rvChecklistItems, position)
+    }
+    
+    private fun deleteChecklistItem(position: Int) {
+        checklistAdapter?.removeItem(position)
+        
+        // Wenn letztes Item gelöscht, automatisch neues hinzufügen
+        if (checklistItems.isEmpty()) {
+            addChecklistItemAt(0)
         }
     }
     
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
         menuInflater.inflate(R.menu.menu_editor, menu)
-        
-        // Show delete only for existing notes
+        // Delete nur für existierende Notizen
         menu.findItem(R.id.action_delete)?.isVisible = existingNote != null
-        
         return true
     }
     
@@ -91,51 +256,96 @@ class NoteEditorActivity : AppCompatActivity() {
     
     private fun saveNote() {
         val title = editTextTitle.text?.toString()?.trim() ?: ""
+        
+        when (currentNoteType) {
+            NoteType.TEXT -> {
                 val content = editTextContent.text?.toString()?.trim() ?: ""
                 
                 if (title.isEmpty() && content.isEmpty()) {
-            showToast("Notiz ist leer")
+                    showToast(getString(R.string.note_is_empty))
                     return
                 }
                 
                 val note = if (existingNote != null) {
-            // Update existing note
                     existingNote!!.copy(
                         title = title,
                         content = content,
+                        noteType = NoteType.TEXT,
+                        checklistItems = null,
                         updatedAt = System.currentTimeMillis(),
                         syncStatus = SyncStatus.PENDING
                     )
                 } else {
-            // Create new note
                     Note(
                         title = title,
                         content = content,
+                        noteType = NoteType.TEXT,
+                        checklistItems = null,
                         deviceId = DeviceIdGenerator.getDeviceId(this),
                         syncStatus = SyncStatus.LOCAL_ONLY
                     )
                 }
                 
                 storage.saveNote(note)
-        showToast("Notiz gespeichert")
+            }
+            
+            NoteType.CHECKLIST -> {
+                // Leere Items filtern
+                val validItems = checklistItems.filter { it.text.isNotBlank() }
+                
+                if (title.isEmpty() && validItems.isEmpty()) {
+                    showToast(getString(R.string.note_is_empty))
+                    return
+                }
+                
+                // Order neu setzen
+                val orderedItems = validItems.mapIndexed { index, item ->
+                    item.copy(order = index)
+                }
+                
+                val note = if (existingNote != null) {
+                    existingNote!!.copy(
+                        title = title,
+                        content = "", // Leer für Checklisten
+                        noteType = NoteType.CHECKLIST,
+                        checklistItems = orderedItems,
+                        updatedAt = System.currentTimeMillis(),
+                        syncStatus = SyncStatus.PENDING
+                    )
+                } else {
+                    Note(
+                        title = title,
+                        content = "",
+                        noteType = NoteType.CHECKLIST,
+                        checklistItems = orderedItems,
+                        deviceId = DeviceIdGenerator.getDeviceId(this),
+                        syncStatus = SyncStatus.LOCAL_ONLY
+                    )
+                }
+                
+                storage.saveNote(note)
+            }
+        }
+        
+        showToast(getString(R.string.note_saved))
         finish()
     }
     
     private fun confirmDelete() {
         AlertDialog.Builder(this)
-            .setTitle("Notiz löschen?")
-            .setMessage("Diese Aktion kann nicht rückgängig gemacht werden.")
-            .setPositiveButton("Löschen") { _, _ ->
+            .setTitle(getString(R.string.delete_note_title))
+            .setMessage(getString(R.string.delete_note_message))
+            .setPositiveButton(getString(R.string.delete)) { _, _ ->
                 deleteNote()
             }
-            .setNegativeButton("Abbrechen", null)
+            .setNegativeButton(getString(R.string.cancel), null)
             .show()
     }
     
     private fun deleteNote() {
         existingNote?.let {
             storage.deleteNote(it.id)
-            showToast("Notiz gelöscht")
+            showToast(getString(R.string.note_deleted))
             finish()
         }
     }

android/app/src/main/java/dev/dettmer/simplenotes/SimpleNotesApplication.kt

@@ -2,6 +2,7 @@ package dev.dettmer.simplenotes
 
 import android.app.Application
 import android.content.Context
+import androidx.appcompat.app.AppCompatDelegate
 import dev.dettmer.simplenotes.utils.Logger
 import dev.dettmer.simplenotes.sync.NetworkMonitor
 import dev.dettmer.simplenotes.utils.NotificationHelper
@@ -15,11 +16,29 @@ class SimpleNotesApplication : Application() {
     
     lateinit var networkMonitor: NetworkMonitor  // Public access für SettingsActivity
     
+    /**
+     * 🌍 v1.7.1: Apply app locale to Application Context
+     * 
+     * This ensures ViewModels and other components using Application Context
+     * get the correct locale-specific strings.
+     */
+    override fun attachBaseContext(base: Context) {
+        // Apply the app locale before calling super
+        // This is handled by AppCompatDelegate which reads from system storage
+        super.attachBaseContext(base)
+    }
+    
     override fun onCreate() {
         super.onCreate()
         
-        // File-Logging ZUERST aktivieren (damit alle Logs geschrieben werden!)
         val prefs = getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)
+        
+        // 🔧 Hotfix v1.6.2: Migrate offline mode setting BEFORE any ViewModel initialization
+        // This prevents the offline mode bug where users updating from v1.5.0 incorrectly
+        // appear as offline even though they have a configured server
+        migrateOfflineModeSetting(prefs)
+        
+        // File-Logging ZUERST aktivieren (damit alle Logs geschrieben werden!)
         if (prefs.getBoolean("file_logging_enabled", false)) {
             Logger.enableFileLogging(this)
             Logger.d(TAG, "📝 File logging enabled at Application startup")
@@ -50,4 +69,30 @@ class SimpleNotesApplication : Application() {
         // WorkManager läuft weiter auch nach onTerminate!
         // Nur bei deaktiviertem Auto-Sync stoppen wir es
     }
+    
+    /**
+     * 🔧 Hotfix v1.6.2: Migrate offline mode setting for updates from v1.5.0
+     * 
+     * Problem: KEY_OFFLINE_MODE didn't exist in v1.5.0, but MainViewModel 
+     * and NoteEditorViewModel use `true` as default, causing existing users 
+     * with configured servers to appear in offline mode after update.
+     * 
+     * Fix: Set the key BEFORE any ViewModel is initialized based on whether
+     * a server was already configured.
+     */
+    private fun migrateOfflineModeSetting(prefs: android.content.SharedPreferences) {
+        if (!prefs.contains(Constants.KEY_OFFLINE_MODE)) {
+            val serverUrl = prefs.getString(Constants.KEY_SERVER_URL, null)
+            val hasServerConfig = !serverUrl.isNullOrEmpty() && 
+                                  serverUrl != "http://" && 
+                                  serverUrl != "https://"
+            
+            // If server was configured → offlineMode = false (continue syncing)
+            // If no server → offlineMode = true (new users / offline users)
+            val offlineModeValue = !hasServerConfig
+            prefs.edit().putBoolean(Constants.KEY_OFFLINE_MODE, offlineModeValue).apply()
+            
+            Logger.i(TAG, "🔄 Migrated offline_mode_enabled: hasServer=$hasServerConfig → offlineMode=$offlineModeValue")
+        }
+    }
 }

android/app/src/main/java/dev/dettmer/simplenotes/adapters/ChecklistEditorAdapter.kt

@@ -0,0 +1,177 @@
+package dev.dettmer.simplenotes.adapters
+
+import android.graphics.Paint
+import android.text.Editable
+import android.text.TextWatcher
+import android.view.LayoutInflater
+import android.view.MotionEvent
+import android.view.View
+import android.view.ViewGroup
+import android.widget.EditText
+import android.widget.ImageButton
+import android.widget.ImageView
+import androidx.recyclerview.widget.RecyclerView
+import com.google.android.material.checkbox.MaterialCheckBox
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.models.ChecklistItem
+
+/**
+ * Adapter für die Bearbeitung von Checklist-Items im Editor
+ * 
+ * v1.4.0: Checklisten-Feature
+ */
+class ChecklistEditorAdapter(
+    private val items: MutableList<ChecklistItem>,
+    private val onItemCheckedChanged: (Int, Boolean) -> Unit,
+    private val onItemTextChanged: (Int, String) -> Unit,
+    private val onItemDeleted: (Int) -> Unit,
+    private val onAddNewItem: (Int) -> Unit,
+    private val onStartDrag: (RecyclerView.ViewHolder) -> Unit
+) : RecyclerView.Adapter<ChecklistEditorAdapter.ViewHolder>() {
+
+    inner class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
+        val dragHandle: ImageView = view.findViewById(R.id.ivDragHandle)
+        val checkbox: MaterialCheckBox = view.findViewById(R.id.cbItem)
+        val editText: EditText = view.findViewById(R.id.etItemText)
+        val deleteButton: ImageButton = view.findViewById(R.id.btnDeleteItem)
+        
+        private var textWatcher: TextWatcher? = null
+        
+        @Suppress("NestedBlockDepth", "UNUSED_PARAMETER")
+        fun bind(item: ChecklistItem, position: Int) {
+            // Vorherigen TextWatcher entfernen um Loops zu vermeiden
+            textWatcher?.let { editText.removeTextChangedListener(it) }
+            
+            // Checkbox
+            checkbox.isChecked = item.isChecked
+            checkbox.setOnCheckedChangeListener { _, isChecked ->
+                onItemCheckedChanged(bindingAdapterPosition, isChecked)
+                updateStrikethrough(isChecked)
+            }
+            
+            // Text
+            editText.setText(item.text)
+            updateStrikethrough(item.isChecked)
+            
+            // v1.4.1: TextWatcher für Änderungen + Enter-Erkennung für neues Item
+            textWatcher = object : TextWatcher {
+                override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}
+                override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {}
+                override fun afterTextChanged(s: Editable?) {
+                    val pos = bindingAdapterPosition
+                    if (pos == RecyclerView.NO_POSITION) return
+                    
+                    val text = s?.toString() ?: ""
+                    
+                    // Prüfe ob ein Newline eingegeben wurde
+                    if (text.contains("\n")) {
+                        // Newline entfernen und neues Item erstellen
+                        val cleanText = text.replace("\n", "")
+                        editText.setText(cleanText)
+                        editText.setSelection(cleanText.length)
+                        onItemTextChanged(pos, cleanText)
+                        onAddNewItem(pos + 1)
+                    } else {
+                        onItemTextChanged(pos, text)
+                    }
+                }
+            }
+            editText.addTextChangedListener(textWatcher)
+            
+            // Delete Button
+            deleteButton.setOnClickListener {
+                val pos = bindingAdapterPosition
+                if (pos != RecyclerView.NO_POSITION) {
+                    onItemDeleted(pos)
+                }
+            }
+            
+            // Drag Handle Touch Listener
+            dragHandle.setOnTouchListener { _, event ->
+                if (event.actionMasked == MotionEvent.ACTION_DOWN) {
+                    onStartDrag(this)
+                }
+                false
+            }
+        }
+        
+        private fun updateStrikethrough(isChecked: Boolean) {
+            if (isChecked) {
+                editText.paintFlags = editText.paintFlags or Paint.STRIKE_THRU_TEXT_FLAG
+                editText.alpha = CHECKED_ITEM_ALPHA
+            } else {
+                editText.paintFlags = editText.paintFlags and Paint.STRIKE_THRU_TEXT_FLAG.inv()
+                editText.alpha = UNCHECKED_ITEM_ALPHA
+            }
+        }
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
+        val view = LayoutInflater.from(parent.context)
+            .inflate(R.layout.item_checklist_editor, parent, false)
+        return ViewHolder(view)
+    }
+
+    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
+        holder.bind(items[position], position)
+    }
+
+    override fun getItemCount(): Int = items.size
+
+    /**
+     * Bewegt ein Item von einer Position zu einer anderen (für Drag & Drop)
+     */
+    fun moveItem(fromPosition: Int, toPosition: Int) {
+        val item = items.removeAt(fromPosition)
+        items.add(toPosition, item)
+        notifyItemMoved(fromPosition, toPosition)
+        
+        // Order-Werte aktualisieren
+        items.forEachIndexed { index, checklistItem ->
+            checklistItem.order = index
+        }
+    }
+    
+    /**
+     * Entfernt ein Item an der angegebenen Position
+     */
+    fun removeItem(position: Int) {
+        if (position in items.indices) {
+            items.removeAt(position)
+            notifyItemRemoved(position)
+            // Order-Werte aktualisieren
+            items.forEachIndexed { index, checklistItem ->
+                checklistItem.order = index
+            }
+        }
+    }
+    
+    /**
+     * Fügt ein neues Item an der angegebenen Position ein
+     */
+    fun insertItem(position: Int, item: ChecklistItem) {
+        items.add(position, item)
+        notifyItemInserted(position)
+        // Order-Werte aktualisieren
+        items.forEachIndexed { index, checklistItem ->
+            checklistItem.order = index
+        }
+    }
+    
+    /**
+     * Fokussiert das EditText des Items an der angegebenen Position
+     */
+    fun focusItem(recyclerView: RecyclerView, position: Int) {
+        recyclerView.post {
+            val viewHolder = recyclerView.findViewHolderForAdapterPosition(position) as? ViewHolder
+            viewHolder?.editText?.requestFocus()
+        }
+    }
+
+    companion object {
+        /** Alpha-Wert für abgehakte Items (durchgestrichen) */
+        private const val CHECKED_ITEM_ALPHA = 0.6f
+        /** Alpha-Wert für nicht abgehakte Items */
+        private const val UNCHECKED_ITEM_ALPHA = 1.0f
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/adapters/NotesAdapter.kt

@@ -1,5 +1,6 @@
 package dev.dettmer.simplenotes.adapters
 
+import android.content.Context
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
@@ -10,10 +11,17 @@ import androidx.recyclerview.widget.ListAdapter
 import androidx.recyclerview.widget.RecyclerView
 import dev.dettmer.simplenotes.R
 import dev.dettmer.simplenotes.models.Note
+import dev.dettmer.simplenotes.models.NoteType
 import dev.dettmer.simplenotes.models.SyncStatus
+import dev.dettmer.simplenotes.utils.Constants
 import dev.dettmer.simplenotes.utils.toReadableTime
 import dev.dettmer.simplenotes.utils.truncate
 
+/**
+ * Adapter für die Notizen-Liste
+ * 
+ * v1.4.0: Unterstützt jetzt TEXT und CHECKLIST Notizen
+ */
 class NotesAdapter(
     private val onNoteClick: (Note) -> Unit
 ) : ListAdapter<Note, NotesAdapter.NoteViewHolder>(NoteDiffCallback()) {
@@ -29,16 +37,52 @@ class NotesAdapter(
     }
     
     inner class NoteViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
+        private val ivNoteTypeIcon: ImageView = itemView.findViewById(R.id.ivNoteTypeIcon)
         private val textViewTitle: TextView = itemView.findViewById(R.id.textViewTitle)
         private val textViewContent: TextView = itemView.findViewById(R.id.textViewContent)
+        private val textViewChecklistPreview: TextView = itemView.findViewById(R.id.textViewChecklistPreview)
         private val textViewTimestamp: TextView = itemView.findViewById(R.id.textViewTimestamp)
         private val imageViewSyncStatus: ImageView = itemView.findViewById(R.id.imageViewSyncStatus)
         
         fun bind(note: Note) {
-            textViewTitle.text = note.title.ifEmpty { "Ohne Titel" }
-            textViewContent.text = note.content.truncate(100)
+            // Titel
+            textViewTitle.text = note.title.ifEmpty { 
+                itemView.context.getString(R.string.untitled) 
+            }
             textViewTimestamp.text = note.updatedAt.toReadableTime()
             
+            // v1.4.0: Typ-spezifische Anzeige
+            when (note.noteType) {
+                NoteType.TEXT -> {
+                    ivNoteTypeIcon.setImageResource(R.drawable.ic_note_24)
+                    textViewContent.text = note.content.truncate(100)
+                    textViewContent.visibility = View.VISIBLE
+                    textViewChecklistPreview.visibility = View.GONE
+                }
+                NoteType.CHECKLIST -> {
+                    ivNoteTypeIcon.setImageResource(R.drawable.ic_checklist_24)
+                    textViewContent.visibility = View.GONE
+                    textViewChecklistPreview.visibility = View.VISIBLE
+                    
+                    // Fortschritt berechnen
+                    val items = note.checklistItems ?: emptyList()
+                    val checkedCount = items.count { it.isChecked }
+                    val totalCount = items.size
+                    
+                    textViewChecklistPreview.text = if (totalCount > 0) {
+                        itemView.context.getString(R.string.checklist_progress, checkedCount, totalCount)
+                    } else {
+                        itemView.context.getString(R.string.empty_checklist)
+                    }
+                }
+            }
+            
+            // Sync Icon nur zeigen wenn Sync konfiguriert ist
+            val prefs = itemView.context.getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)
+            val serverUrl = prefs.getString(Constants.KEY_SERVER_URL, null)
+            val isSyncConfigured = !serverUrl.isNullOrEmpty()
+            
+            if (isSyncConfigured) {
                 // Sync status icon
                 val syncIcon = when (note.syncStatus) {
                     SyncStatus.SYNCED -> android.R.drawable.ic_menu_upload
@@ -47,6 +91,11 @@ class NotesAdapter(
                     SyncStatus.LOCAL_ONLY -> android.R.drawable.ic_menu_save
                 }
                 imageViewSyncStatus.setImageResource(syncIcon)
+                imageViewSyncStatus.visibility = View.VISIBLE
+            } else {
+                // Sync nicht konfiguriert → Icon verstecken
+                imageViewSyncStatus.visibility = View.GONE
+            }
             
             itemView.setOnClickListener {
                 onNoteClick(note)

android/app/src/main/java/dev/dettmer/simplenotes/backup/BackupManager.kt

@@ -0,0 +1,416 @@
+package dev.dettmer.simplenotes.backup
+
+import android.content.Context
+import android.net.Uri
+import com.google.gson.Gson
+import com.google.gson.GsonBuilder
+import dev.dettmer.simplenotes.BuildConfig
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.models.Note
+import dev.dettmer.simplenotes.storage.NotesStorage
+import dev.dettmer.simplenotes.utils.Logger
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import java.io.File
+import java.text.SimpleDateFormat
+import java.util.*
+
+/**
+ * BackupManager: Lokale Backup & Restore Funktionalität
+ * 
+ * Features:
+ * - Backup aller Notizen in JSON-Datei
+ * - Restore mit 3 Modi (Merge, Replace, Overwrite Duplicates)
+ * - Auto-Backup vor Restore (Sicherheitsnetz)
+ * - Backup-Validierung
+ */
+class BackupManager(private val context: Context) {
+    
+    companion object {
+        private const val TAG = "BackupManager"
+        private const val BACKUP_VERSION = 1
+        private const val AUTO_BACKUP_DIR = "auto_backups"
+        private const val AUTO_BACKUP_RETENTION_DAYS = 7
+        private const val MAGIC_BYTES_LENGTH = 4  // v1.7.0: For encryption check
+    }
+    
+    private val storage = NotesStorage(context)
+    private val gson: Gson = GsonBuilder().setPrettyPrinting().create()
+    private val encryptionManager = EncryptionManager()  // 🔐 v1.7.0
+    
+    /**
+     * Erstellt Backup aller Notizen
+     * 
+     * @param uri Output-URI (via Storage Access Framework)
+     * @param password Optional password for encryption (null = unencrypted)
+     * @return BackupResult mit Erfolg/Fehler Info
+     */
+    suspend fun createBackup(uri: Uri, password: String? = null): BackupResult = withContext(Dispatchers.IO) {
+        return@withContext try {
+            val encryptedSuffix = if (password != null) " (encrypted)" else ""
+            Logger.d(TAG, "📦 Creating backup$encryptedSuffix to: $uri")
+            
+            val allNotes = storage.loadAllNotes()
+            Logger.d(TAG, "   Found ${allNotes.size} notes to backup")
+            
+            val backupData = BackupData(
+                backupVersion = BACKUP_VERSION,
+                createdAt = System.currentTimeMillis(),
+                notesCount = allNotes.size,
+                appVersion = BuildConfig.VERSION_NAME,
+                notes = allNotes
+            )
+            
+            val jsonString = gson.toJson(backupData)
+            
+            // 🔐 v1.7.0: Encrypt if password is provided
+            val dataToWrite = if (password != null) {
+                encryptionManager.encrypt(jsonString.toByteArray(), password)
+            } else {
+                jsonString.toByteArray()
+            }
+            
+            context.contentResolver.openOutputStream(uri)?.use { outputStream ->
+                outputStream.write(dataToWrite)
+                Logger.d(TAG, "✅ Backup created successfully$encryptedSuffix")
+            }
+            
+            BackupResult(
+                success = true,
+                notesCount = allNotes.size,
+                message = "Backup erstellt: ${allNotes.size} Notizen$encryptedSuffix"
+            )
+            
+        } catch (e: Exception) {
+            Logger.e(TAG, "Failed to create backup", e)
+            BackupResult(
+                success = false,
+                error = "Backup fehlgeschlagen: ${e.message}"
+            )
+        }
+    }
+    
+    /**
+     * Erstellt automatisches Backup (vor Restore)
+     * Gespeichert in app-internem Storage
+     * 
+     * @return Uri des Auto-Backups oder null bei Fehler
+     */
+    suspend fun createAutoBackup(): Uri? = withContext(Dispatchers.IO) {
+        return@withContext try {
+            val autoBackupDir = File(context.filesDir, AUTO_BACKUP_DIR).apply {
+                if (!exists()) mkdirs()
+            }
+            
+            val timestamp = SimpleDateFormat("yyyy-MM-dd_HHmmss", Locale.US)
+                .format(Date())
+            val filename = "auto_backup_before_restore_$timestamp.json"
+            val file = File(autoBackupDir, filename)
+            
+            Logger.d(TAG, "📦 Creating auto-backup: ${file.absolutePath}")
+            
+            val allNotes = storage.loadAllNotes()
+            val backupData = BackupData(
+                backupVersion = BACKUP_VERSION,
+                createdAt = System.currentTimeMillis(),
+                notesCount = allNotes.size,
+                appVersion = BuildConfig.VERSION_NAME,
+                notes = allNotes
+            )
+            
+            file.writeText(gson.toJson(backupData))
+            
+            // Cleanup alte Auto-Backups
+            cleanupOldAutoBackups(autoBackupDir)
+            
+            Logger.d(TAG, "✅ Auto-backup created: ${file.absolutePath}")
+            Uri.fromFile(file)
+            
+        } catch (e: Exception) {
+            Logger.e(TAG, "Failed to create auto-backup", e)
+            null
+        }
+    }
+    
+    /**
+     * Stellt Notizen aus Backup wieder her
+     * 
+     * @param uri Backup-Datei URI
+     * @param mode Wiederherstellungs-Modus (Merge/Replace/Overwrite)
+     * @param password Optional password if backup is encrypted
+     * @return RestoreResult mit Details
+     */
+    suspend fun restoreBackup(uri: Uri, mode: RestoreMode, password: String? = null): RestoreResult = withContext(Dispatchers.IO) {
+        return@withContext try {
+            Logger.d(TAG, "📥 Restoring backup from: $uri (mode: $mode)")
+            
+            // 1. Backup-Datei lesen
+            val fileData = context.contentResolver.openInputStream(uri)?.use { inputStream ->
+                inputStream.readBytes()
+            } ?: return@withContext RestoreResult(
+                success = false,
+                error = "Datei konnte nicht gelesen werden"
+            )
+            
+            // 🔐 v1.7.0: Check if encrypted and decrypt if needed
+            val jsonString = try {
+                if (encryptionManager.isEncrypted(fileData)) {
+                    if (password == null) {
+                        return@withContext RestoreResult(
+                            success = false,
+                            error = "Backup ist verschlüsselt. Bitte Passwort eingeben."
+                        )
+                    }
+                    val decrypted = encryptionManager.decrypt(fileData, password)
+                    String(decrypted)
+                } else {
+                    String(fileData)
+                }
+            } catch (e: EncryptionException) {
+                return@withContext RestoreResult(
+                    success = false,
+                    error = "Entschlüsselung fehlgeschlagen: ${e.message}"
+                )
+            }
+            
+            // 2. Backup validieren & parsen
+            val validationResult = validateBackup(jsonString)
+            if (!validationResult.isValid) {
+                return@withContext RestoreResult(
+                    success = false,
+                    error = validationResult.errorMessage ?: context.getString(R.string.error_invalid_backup_file)
+                )
+            }
+            
+            val backupData = gson.fromJson(jsonString, BackupData::class.java)
+            Logger.d(TAG, "   Backup valid: ${backupData.notesCount} notes, version ${backupData.backupVersion}")
+            
+            // 3. Auto-Backup erstellen (Sicherheitsnetz)
+            val autoBackupUri = createAutoBackup()
+            if (autoBackupUri == null) {
+                Logger.w(TAG, "⚠️ Auto-backup failed, but continuing with restore")
+            }
+            
+            // 4. Restore durchführen (je nach Modus)
+            val result = when (mode) {
+                RestoreMode.MERGE -> restoreMerge(backupData.notes)
+                RestoreMode.REPLACE -> restoreReplace(backupData.notes)
+                RestoreMode.OVERWRITE_DUPLICATES -> restoreOverwriteDuplicates(backupData.notes)
+            }
+            
+            Logger.d(TAG, "✅ Restore completed: ${result.importedNotes} imported, ${result.skippedNotes} skipped")
+            result
+            
+        } catch (e: Exception) {
+            Logger.e(TAG, "Failed to restore backup", e)
+            RestoreResult(
+                success = false,
+                error = context.getString(R.string.error_restore_failed, e.message ?: "")
+            )
+        }
+    }
+    
+    /**
+     * 🔐 v1.7.0: Check if backup file is encrypted
+     */
+    suspend fun isBackupEncrypted(uri: Uri): Boolean = withContext(Dispatchers.IO) {
+        return@withContext try {
+            context.contentResolver.openInputStream(uri)?.use { inputStream ->
+                val header = ByteArray(MAGIC_BYTES_LENGTH)
+                val bytesRead = inputStream.read(header)
+                bytesRead == MAGIC_BYTES_LENGTH && encryptionManager.isEncrypted(header)
+            } ?: false
+        } catch (e: Exception) {
+            Logger.e(TAG, "Failed to check encryption status", e)
+            false
+        }
+    }
+    
+    /**
+     * Validiert Backup-Datei
+     */
+    private fun validateBackup(jsonString: String): ValidationResult {
+        return try {
+            val backupData = gson.fromJson(jsonString, BackupData::class.java)
+            
+            // Version kompatibel?
+            if (backupData.backupVersion > BACKUP_VERSION) {
+                return ValidationResult(
+                    isValid = false,
+                    errorMessage = context.getString(R.string.error_backup_version_unsupported, backupData.backupVersion, BACKUP_VERSION)
+                )
+            }
+            
+            // Notizen-Array vorhanden?
+            if (backupData.notes.isEmpty()) {
+                return ValidationResult(
+                    isValid = false,
+                    errorMessage = context.getString(R.string.error_backup_empty)
+                )
+            }
+            
+            // Alle Notizen haben ID, title, content?
+            val invalidNotes = backupData.notes.filter { note ->
+                note.id.isBlank() || note.title.isBlank()
+            }
+            
+            if (invalidNotes.isNotEmpty()) {
+                return ValidationResult(
+                    isValid = false,
+                    errorMessage = context.getString(R.string.error_backup_invalid_notes, invalidNotes.size)
+                )
+            }
+            
+            ValidationResult(isValid = true)
+            
+        } catch (e: Exception) {
+            ValidationResult(
+                isValid = false,
+                errorMessage = context.getString(R.string.error_backup_corrupt, e.message ?: "")
+            )
+        }
+    }
+    
+    /**
+     * Restore-Modus: MERGE
+     * Fügt neue Notizen hinzu, behält bestehende
+     */
+    private fun restoreMerge(backupNotes: List<Note>): RestoreResult {
+        val existingNotes = storage.loadAllNotes()
+        val existingIds = existingNotes.map { it.id }.toSet()
+        
+        val newNotes = backupNotes.filter { it.id !in existingIds }
+        val skippedNotes = backupNotes.size - newNotes.size
+        
+        newNotes.forEach { note ->
+            storage.saveNote(note)
+        }
+        
+        return RestoreResult(
+            success = true,
+            importedNotes = newNotes.size,
+            skippedNotes = skippedNotes,
+            message = context.getString(R.string.restore_merge_result, newNotes.size, skippedNotes)
+        )
+    }
+    
+    /**
+     * Restore-Modus: REPLACE
+     * Löscht alle bestehenden Notizen, importiert Backup
+     */
+    private fun restoreReplace(backupNotes: List<Note>): RestoreResult {
+        // Alle bestehenden Notizen löschen
+        storage.deleteAllNotes()
+        
+        // Backup-Notizen importieren
+        backupNotes.forEach { note ->
+            storage.saveNote(note)
+        }
+        
+        return RestoreResult(
+            success = true,
+            importedNotes = backupNotes.size,
+            skippedNotes = 0,
+            message = context.getString(R.string.restore_replace_result, backupNotes.size)
+        )
+    }
+
+    /**
+     * Restore-Modus: OVERWRITE_DUPLICATES
+     * Backup überschreibt bei ID-Konflikten
+     */
+    private fun restoreOverwriteDuplicates(backupNotes: List<Note>): RestoreResult {
+        val existingNotes = storage.loadAllNotes()
+        val existingIds = existingNotes.map { it.id }.toSet()
+        
+        val newNotes = backupNotes.filter { it.id !in existingIds }
+        val overwrittenNotes = backupNotes.filter { it.id in existingIds }
+        
+        // Alle Backup-Notizen speichern (überschreibt automatisch)
+        backupNotes.forEach { note ->
+            storage.saveNote(note)
+        }
+        
+        return RestoreResult(
+            success = true,
+            importedNotes = newNotes.size,
+            skippedNotes = 0,
+            overwrittenNotes = overwrittenNotes.size,
+            message = context.getString(R.string.restore_overwrite_result, newNotes.size, overwrittenNotes.size)
+        )
+    }
+    
+    /**
+     * Löscht Auto-Backups älter als RETENTION_DAYS
+     */
+    private fun cleanupOldAutoBackups(autoBackupDir: File) {
+        try {
+            val retentionTimeMs = AUTO_BACKUP_RETENTION_DAYS * 24 * 60 * 60 * 1000L
+            val cutoffTime = System.currentTimeMillis() - retentionTimeMs
+            
+            autoBackupDir.listFiles()?.forEach { file ->
+                if (file.lastModified() < cutoffTime) {
+                    Logger.d(TAG, "🗑️ Deleting old auto-backup: ${file.name}")
+                    file.delete()
+                }
+            }
+        } catch (e: Exception) {
+            Logger.e(TAG, "Failed to cleanup old backups", e)
+        }
+    }
+}
+
+/**
+ * Backup-Daten Struktur (JSON)
+ * NOTE: Property names use @SerializedName for JSON compatibility with snake_case
+ */
+data class BackupData(
+    @com.google.gson.annotations.SerializedName("backup_version")
+    val backupVersion: Int,
+    @com.google.gson.annotations.SerializedName("created_at")
+    val createdAt: Long,
+    @com.google.gson.annotations.SerializedName("notes_count")
+    val notesCount: Int,
+    @com.google.gson.annotations.SerializedName("app_version")
+    val appVersion: String,
+    val notes: List<Note>
+)
+
+/**
+ * Wiederherstellungs-Modi
+ */
+enum class RestoreMode {
+    MERGE,                  // Bestehende + Neue (Standard)
+    REPLACE,                // Alles löschen + Importieren
+    OVERWRITE_DUPLICATES    // Backup überschreibt bei ID-Konflikten
+}
+
+/**
+ * Backup-Ergebnis
+ */
+data class BackupResult(
+    val success: Boolean,
+    val notesCount: Int = 0,
+    val message: String? = null,
+    val error: String? = null
+)
+
+/**
+ * Restore-Ergebnis
+ */
+data class RestoreResult(
+    val success: Boolean,
+    val importedNotes: Int = 0,
+    val skippedNotes: Int = 0,
+    val overwrittenNotes: Int = 0,
+    val message: String? = null,
+    val error: String? = null
+)
+
+/**
+ * Validierungs-Ergebnis
+ */
+data class ValidationResult(
+    val isValid: Boolean,
+    val errorMessage: String? = null
+)

android/app/src/main/java/dev/dettmer/simplenotes/backup/EncryptionManager.kt

@@ -0,0 +1,172 @@
+package dev.dettmer.simplenotes.backup
+
+import dev.dettmer.simplenotes.utils.Logger
+import java.nio.ByteBuffer
+import java.nio.charset.StandardCharsets
+import java.security.SecureRandom
+import javax.crypto.Cipher
+import javax.crypto.SecretKeyFactory
+import javax.crypto.spec.GCMParameterSpec
+import javax.crypto.spec.PBEKeySpec
+import javax.crypto.spec.SecretKeySpec
+
+/**
+ * 🔐 v1.7.0: Encryption Manager for Backup Files
+ * 
+ * Provides AES-256-GCM encryption for local backups with:
+ * - Password-based encryption (PBKDF2 key derivation)
+ * - Random salt + IV for each encryption
+ * - GCM authentication tag for integrity
+ * - Simple file format: [MAGIC][VERSION][SALT][IV][ENCRYPTED_DATA]
+ */
+class EncryptionManager {
+    
+    companion object {
+        private const val TAG = "EncryptionManager"
+        
+        // File format constants
+        private const val MAGIC = "SNE1"  // Simple Notes Encrypted v1
+        private const val VERSION: Byte = 1
+        private const val MAGIC_BYTES = 4
+        private const val VERSION_BYTES = 1
+        private const val SALT_LENGTH = 32  // 256 bits
+        private const val IV_LENGTH = 12    // 96 bits (recommended for GCM)
+        private const val HEADER_LENGTH = MAGIC_BYTES + VERSION_BYTES + SALT_LENGTH + IV_LENGTH  // 49 bytes
+        
+        // Encryption constants
+        private const val KEY_LENGTH = 256  // AES-256
+        private const val GCM_TAG_LENGTH = 128  // 128 bits
+        private const val PBKDF2_ITERATIONS = 100_000  // OWASP recommendation
+        
+        // Algorithm names
+        private const val KEY_DERIVATION_ALGORITHM = "PBKDF2WithHmacSHA256"
+        private const val ENCRYPTION_ALGORITHM = "AES/GCM/NoPadding"
+    }
+    
+    /**
+     * Encrypt data with password
+     * 
+     * @param data Plaintext data to encrypt
+     * @param password User password
+     * @return Encrypted byte array with header [MAGIC][VERSION][SALT][IV][CIPHERTEXT]
+     */
+    fun encrypt(data: ByteArray, password: String): ByteArray {
+        Logger.d(TAG, "🔐 Encrypting ${data.size} bytes...")
+        
+        // Generate random salt and IV
+        val salt = ByteArray(SALT_LENGTH)
+        val iv = ByteArray(IV_LENGTH)
+        SecureRandom().apply {
+            nextBytes(salt)
+            nextBytes(iv)
+        }
+        
+        // Derive encryption key from password
+        val key = deriveKey(password, salt)
+        
+        // Encrypt data
+        val cipher = Cipher.getInstance(ENCRYPTION_ALGORITHM)
+        val secretKey = SecretKeySpec(key, "AES")
+        val gcmSpec = GCMParameterSpec(GCM_TAG_LENGTH, iv)
+        cipher.init(Cipher.ENCRYPT_MODE, secretKey, gcmSpec)
+        val ciphertext = cipher.doFinal(data)
+        
+        // Build encrypted file: MAGIC + VERSION + SALT + IV + CIPHERTEXT
+        val result = ByteBuffer.allocate(HEADER_LENGTH + ciphertext.size).apply {
+            put(MAGIC.toByteArray(StandardCharsets.US_ASCII))
+            put(VERSION)
+            put(salt)
+            put(iv)
+            put(ciphertext)
+        }.array()
+        
+        Logger.d(TAG, "✅ Encryption successful: ${result.size} bytes (header: $HEADER_LENGTH, ciphertext: ${ciphertext.size})")
+        return result
+    }
+    
+    /**
+     * Decrypt data with password
+     * 
+     * @param encryptedData Encrypted byte array (with header)
+     * @param password User password
+     * @return Decrypted plaintext
+     * @throws EncryptionException if decryption fails (wrong password, corrupted data, etc.)
+     */
+    @Suppress("ThrowsCount") // Multiple validation steps require separate throws
+    fun decrypt(encryptedData: ByteArray, password: String): ByteArray {
+        Logger.d(TAG, "🔓 Decrypting ${encryptedData.size} bytes...")
+        
+        // Validate minimum size
+        if (encryptedData.size < HEADER_LENGTH) {
+            throw EncryptionException("File too small: ${encryptedData.size} bytes (expected at least $HEADER_LENGTH)")
+        }
+        
+        // Parse header
+        val buffer = ByteBuffer.wrap(encryptedData)
+        
+        // Verify magic bytes
+        val magic = ByteArray(MAGIC_BYTES)
+        buffer.get(magic)
+        val magicString = String(magic, StandardCharsets.US_ASCII)
+        if (magicString != MAGIC) {
+            throw EncryptionException("Invalid file format: expected '$MAGIC', got '$magicString'")
+        }
+        
+        // Check version
+        val version = buffer.get()
+        if (version != VERSION) {
+            throw EncryptionException("Unsupported version: $version (expected $VERSION)")
+        }
+        
+        // Extract salt and IV
+        val salt = ByteArray(SALT_LENGTH)
+        val iv = ByteArray(IV_LENGTH)
+        buffer.get(salt)
+        buffer.get(iv)
+        
+        // Extract ciphertext
+        val ciphertext = ByteArray(buffer.remaining())
+        buffer.get(ciphertext)
+        
+        // Derive key from password
+        val key = deriveKey(password, salt)
+        
+        // Decrypt
+        return try {
+            val cipher = Cipher.getInstance(ENCRYPTION_ALGORITHM)
+            val secretKey = SecretKeySpec(key, "AES")
+            val gcmSpec = GCMParameterSpec(GCM_TAG_LENGTH, iv)
+            cipher.init(Cipher.DECRYPT_MODE, secretKey, gcmSpec)
+            val plaintext = cipher.doFinal(ciphertext)
+            
+            Logger.d(TAG, "✅ Decryption successful: ${plaintext.size} bytes")
+            plaintext
+        } catch (e: Exception) {
+            Logger.e(TAG, "Decryption failed", e)
+            throw EncryptionException("Decryption failed: ${e.message}. Wrong password?", e)
+        }
+    }
+    
+    /**
+     * Derive 256-bit encryption key from password using PBKDF2
+     */
+    private fun deriveKey(password: String, salt: ByteArray): ByteArray {
+        val spec = PBEKeySpec(password.toCharArray(), salt, PBKDF2_ITERATIONS, KEY_LENGTH)
+        val factory = SecretKeyFactory.getInstance(KEY_DERIVATION_ALGORITHM)
+        return factory.generateSecret(spec).encoded
+    }
+    
+    /**
+     * Check if data is encrypted (starts with magic bytes)
+     */
+    fun isEncrypted(data: ByteArray): Boolean {
+        if (data.size < MAGIC_BYTES) return false
+        val magic = data.sliceArray(0 until MAGIC_BYTES)
+        return String(magic, StandardCharsets.US_ASCII) == MAGIC
+    }
+}
+
+/**
+ * Exception thrown when encryption/decryption fails
+ */
+class EncryptionException(message: String, cause: Throwable? = null) : Exception(message, cause)

android/app/src/main/java/dev/dettmer/simplenotes/models/ChecklistItem.kt

@@ -0,0 +1,34 @@
+package dev.dettmer.simplenotes.models
+
+import java.util.UUID
+
+/**
+ * Repräsentiert ein einzelnes Item in einer Checkliste
+ * 
+ * v1.4.0: Checklisten-Feature
+ * 
+ * @property id Eindeutige ID für Sync-Konflikterkennung
+ * @property text Der Text des Items
+ * @property isChecked Ob das Item abgehakt ist
+ * @property order Sortierreihenfolge (0-basiert)
+ */
+data class ChecklistItem(
+    val id: String = UUID.randomUUID().toString(),
+    val text: String = "",
+    var isChecked: Boolean = false,
+    var order: Int = 0
+) {
+    companion object {
+        /**
+         * Erstellt ein neues leeres ChecklistItem
+         */
+        fun createEmpty(order: Int): ChecklistItem {
+            return ChecklistItem(
+                id = UUID.randomUUID().toString(),
+                text = "",
+                isChecked = false,
+                order = order
+            )
+        }
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/models/DeletionTracker.kt

@@ -0,0 +1,81 @@
+package dev.dettmer.simplenotes.models
+
+import dev.dettmer.simplenotes.utils.Logger
+import org.json.JSONArray
+import org.json.JSONObject
+
+data class DeletionRecord(
+    val id: String,
+    val deletedAt: Long,
+    val deviceId: String
+)
+
+data class DeletionTracker(
+    val version: Int = 1,
+    val deletedNotes: MutableList<DeletionRecord> = mutableListOf()
+) {
+    fun addDeletion(noteId: String, deviceId: String) {
+        if (!deletedNotes.any { it.id == noteId }) {
+            deletedNotes.add(DeletionRecord(noteId, System.currentTimeMillis(), deviceId))
+        }
+    }
+    
+    fun isDeleted(noteId: String): Boolean {
+        return deletedNotes.any { it.id == noteId }
+    }
+    
+    fun getDeletionTimestamp(noteId: String): Long? {
+        return deletedNotes.find { it.id == noteId }?.deletedAt
+    }
+    
+    fun removeDeletion(noteId: String) {
+        deletedNotes.removeIf { it.id == noteId }
+    }
+    
+    fun toJson(): String {
+        val jsonObject = JSONObject()
+        jsonObject.put("version", version)
+        
+        val notesArray = JSONArray()
+        for (record in deletedNotes) {
+            val recordObj = JSONObject()
+            recordObj.put("id", record.id)
+            recordObj.put("deletedAt", record.deletedAt)
+            recordObj.put("deviceId", record.deviceId)
+            notesArray.put(recordObj)
+        }
+        jsonObject.put("deletedNotes", notesArray)
+        
+        return jsonObject.toString(2)  // Pretty print with 2-space indent
+    }
+    
+    companion object {
+        private const val TAG = "DeletionTracker"
+        
+        fun fromJson(json: String): DeletionTracker? {
+            return try {
+                val jsonObject = JSONObject(json)
+                val version = jsonObject.optInt("version", 1)
+                val deletedNotes = mutableListOf<DeletionRecord>()
+                
+                val notesArray = jsonObject.optJSONArray("deletedNotes")
+                if (notesArray != null) {
+                    for (i in 0 until notesArray.length()) {
+                        val recordObj = notesArray.getJSONObject(i)
+                        val record = DeletionRecord(
+                            id = recordObj.getString("id"),
+                            deletedAt = recordObj.getLong("deletedAt"),
+                            deviceId = recordObj.getString("deviceId")
+                        )
+                        deletedNotes.add(record)
+                    }
+                }
+                
+                DeletionTracker(version, deletedNotes)
+            } catch (e: Exception) {
+                Logger.w(TAG, "Failed to parse DeletionTracker JSON: ${e.message}")
+                null
+            }
+        }
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/models/Note.kt

@@ -1,7 +1,19 @@
 package dev.dettmer.simplenotes.models
 
+import androidx.compose.runtime.Immutable
+import dev.dettmer.simplenotes.utils.Logger
+import java.text.SimpleDateFormat
+import java.util.Date
+import java.util.Locale
+import java.util.TimeZone
 import java.util.UUID
 
+/**
+ * Note data class with Compose stability annotation.
+ * @Immutable tells Compose this class is stable and won't change unexpectedly,
+ * enabling skip optimizations during recomposition.
+ */
+@Immutable
 data class Note(
     val id: String = UUID.randomUUID().toString(),
     val title: String,
@@ -9,30 +21,332 @@ data class Note(
     val createdAt: Long = System.currentTimeMillis(),
     val updatedAt: Long = System.currentTimeMillis(),
     val deviceId: String,
-    val syncStatus: SyncStatus = SyncStatus.LOCAL_ONLY
+    val syncStatus: SyncStatus = SyncStatus.LOCAL_ONLY,
+    // v1.4.0: Checklisten-Felder
+    val noteType: NoteType = NoteType.TEXT,
+    val checklistItems: List<ChecklistItem>? = null
 ) {
+    /**
+     * Serialisiert Note zu JSON
+     * v1.4.0: Nutzt Gson für komplexe Strukturen
+     * v1.4.1: Für Checklisten wird ein Fallback-Content generiert, damit ältere
+     *         App-Versionen (v1.3.x) die Notiz als Text anzeigen können.
+     */
     fun toJson(): String {
-        return """
-        {
-            "id": "$id",
-            "title": "${title.escapeJson()}",
-            "content": "${content.escapeJson()}",
-            "createdAt": $createdAt,
-            "updatedAt": $updatedAt,
-            "deviceId": "$deviceId",
-            "syncStatus": "${syncStatus.name}"
+        val gson = com.google.gson.GsonBuilder()
+            .setPrettyPrinting()
+            .create()
+        
+        // v1.4.1: Für Checklisten den Fallback-Content generieren
+        val noteToSerialize = if (noteType == NoteType.CHECKLIST && checklistItems != null) {
+            this.copy(content = generateChecklistFallbackContent())
+        } else {
+            this
         }
+        
+        return gson.toJson(noteToSerialize)
+    }
+    
+    /**
+     * v1.4.1: Generiert einen lesbaren Text-Fallback aus Checklist-Items.
+     * Format: GitHub-Style Task-Listen (kompatibel mit Markdown)
+     * 
+     * Beispiel:
+     * [ ] Milch kaufen
+     * [x] Brot gekauft
+     * [ ] Eier
+     * 
+     * Wird von älteren App-Versionen (v1.3.x) als normaler Text angezeigt.
+     */
+    private fun generateChecklistFallbackContent(): String {
+        return checklistItems?.sortedBy { it.order }?.joinToString("\n") { item ->
+            val checkbox = if (item.isChecked) "[x]" else "[ ]"
+            "$checkbox ${item.text}"
+        } ?: ""
+    }
+    
+    /**
+     * Konvertiert Note zu Markdown mit YAML Frontmatter (Task #1.2.0-08)
+     * Format kompatibel mit Obsidian, Joplin, Typora
+     * v1.4.0: Unterstützt jetzt auch Checklisten-Format
+     */
+    fun toMarkdown(): String {
+        val header = """
+---
+id: $id
+created: ${formatISO8601(createdAt)}
+updated: ${formatISO8601(updatedAt)}
+device: $deviceId
+type: ${noteType.name.lowercase()}
+---
+
+# $title
+
 """.trimIndent()
+        
+        return when (noteType) {
+            NoteType.TEXT -> header + content
+            NoteType.CHECKLIST -> {
+                val checklistMarkdown = checklistItems?.sortedBy { it.order }?.joinToString("\n") { item ->
+                    val checkbox = if (item.isChecked) "[x]" else "[ ]"
+                    "- $checkbox ${item.text}"
+                } ?: ""
+                header + checklistMarkdown
+            }
+        }
     }
     
     companion object {
+        private const val TAG = "Note"
+        
+        /**
+         * Parst JSON zu Note-Objekt mit Backward Compatibility für alte Notizen ohne noteType
+         */
         fun fromJson(json: String): Note? {
             return try {
                 val gson = com.google.gson.Gson()
-                gson.fromJson(json, Note::class.java)
+                val jsonObject = com.google.gson.JsonParser.parseString(json).asJsonObject
+                
+                // Backward Compatibility: Alte Notizen ohne noteType bekommen TEXT
+                val noteType = if (jsonObject.has("noteType") && !jsonObject.get("noteType").isJsonNull) {
+                    try {
+                        NoteType.valueOf(jsonObject.get("noteType").asString)
                     } catch (e: Exception) {
+                        Logger.w(TAG, "Unknown noteType, defaulting to TEXT: ${e.message}")
+                        NoteType.TEXT
+                    }
+                } else {
+                    NoteType.TEXT
+                }
+                
+                // Parsen der Basis-Note
+                val rawNote = gson.fromJson(json, NoteRaw::class.java)
+                
+                // Checklist-Items parsen (kann null sein)
+                val checklistItemsType = object : com.google.gson.reflect.TypeToken<List<ChecklistItem>>() {}.type
+                var checklistItems: List<ChecklistItem>? = if (jsonObject.has("checklistItems") &&
+                    !jsonObject.get("checklistItems").isJsonNull
+                ) {
+                    gson.fromJson<List<ChecklistItem>>(
+                        jsonObject.get("checklistItems"),
+                        checklistItemsType
+                    )
+                } else {
                     null
                 }
+                
+                // v1.4.1: Recovery-Mode - Falls Checkliste aber keine Items, 
+                // versuche Content als Fallback zu parsen
+                if (noteType == NoteType.CHECKLIST && 
+                    (checklistItems == null || checklistItems.isEmpty()) &&
+                    rawNote.content.isNotBlank()) {
+                    
+                    val recoveredItems = parseChecklistFromContent(rawNote.content)
+                    if (recoveredItems.isNotEmpty()) {
+                        Logger.d(TAG, "🔄 Recovered ${recoveredItems.size} checklist items from content fallback")
+                        checklistItems = recoveredItems
+                    }
+                }
+                
+                // Note mit korrekten Werten erstellen
+                Note(
+                    id = rawNote.id,
+                    title = rawNote.title,
+                    content = rawNote.content,
+                    createdAt = rawNote.createdAt,
+                    updatedAt = rawNote.updatedAt,
+                    deviceId = rawNote.deviceId,
+                    syncStatus = rawNote.syncStatus ?: SyncStatus.LOCAL_ONLY,
+                    noteType = noteType,
+                    checklistItems = checklistItems
+                )
+            } catch (e: Exception) {
+                Logger.w(TAG, "Failed to parse JSON: ${e.message}")
+                null
+            }
+        }
+        
+        /**
+         * Hilfsklasse für Gson-Parsing mit nullable Feldern
+         */
+        private data class NoteRaw(
+            val id: String = UUID.randomUUID().toString(),
+            val title: String = "",
+            val content: String = "",
+            val createdAt: Long = System.currentTimeMillis(),
+            val updatedAt: Long = System.currentTimeMillis(),
+            val deviceId: String = "",
+            val syncStatus: SyncStatus? = null
+        )
+        
+        /**
+         * v1.4.1: Parst GitHub-Style Checklisten aus Text (Recovery-Mode).
+         * 
+         * Unterstützte Formate:
+         * - [ ] Unchecked item
+         * - [x] Checked item
+         * - [X] Checked item (case insensitive)
+         * 
+         * Wird verwendet, wenn eine v1.4.0 Checkliste von einer älteren
+         * App-Version (v1.3.x) bearbeitet wurde und die checklistItems verloren gingen.
+         * 
+         * @param content Der Text-Content der Notiz
+         * @return Liste von ChecklistItems oder leere Liste
+         */
+        private fun parseChecklistFromContent(content: String): List<ChecklistItem> {
+            val pattern = Regex("""^\s*\[([ xX])\]\s*(.+)$""", RegexOption.MULTILINE)
+            return pattern.findAll(content).mapIndexed { index, match ->
+                val checked = match.groupValues[1].lowercase() == "x"
+                val text = match.groupValues[2].trim()
+                ChecklistItem(
+                    id = UUID.randomUUID().toString(),
+                    text = text,
+                    isChecked = checked,
+                    order = index
+                )
+            }.toList()
+        }
+        
+        /**
+         * Parst Markdown zurück zu Note-Objekt (Task #1.2.0-09)
+         * v1.4.0: Unterstützt jetzt auch Checklisten-Format
+         * 
+         * @param md Markdown-String mit YAML Frontmatter
+         * @return Note-Objekt oder null bei Parse-Fehler
+         */
+        fun fromMarkdown(md: String): Note? {
+            return try {
+                // Parse YAML Frontmatter + Markdown Content
+                val frontmatterRegex = Regex("^---\\n(.+?)\\n---\\n(.*)$", RegexOption.DOT_MATCHES_ALL)
+                val match = frontmatterRegex.find(md) ?: return null
+                
+                val yamlBlock = match.groupValues[1]
+                val contentBlock = match.groupValues[2]
+                
+                // Parse YAML (einfach per String-Split für MVP)
+                val metadata = yamlBlock.lines()
+                    .mapNotNull { line ->
+                        val parts = line.split(":", limit = 2)
+                        if (parts.size == 2) {
+                            parts[0].trim() to parts[1].trim()
+                        } else null
+                    }.toMap()
+                
+                // Extract title from first # heading
+                val title = contentBlock.lines()
+                    .firstOrNull { it.startsWith("# ") }
+                    ?.removePrefix("# ")?.trim() ?: "Untitled"
+                
+                // v1.4.0: Prüfe ob type: checklist im Frontmatter
+                val noteTypeStr = metadata["type"]?.lowercase() ?: "text"
+                val noteType = when (noteTypeStr) {
+                    "checklist" -> NoteType.CHECKLIST
+                    else -> NoteType.TEXT
+                }
+                
+                // v1.4.0: Parse Content basierend auf Typ
+                // FIX: Robusteres Parsing - suche nach dem Titel-Header und extrahiere den Rest
+                val titleLineIndex = contentBlock.lines().indexOfFirst { it.startsWith("# ") }
+                val contentAfterTitle = if (titleLineIndex >= 0) {
+                    // Alles nach der Titel-Zeile, überspringe führende Leerzeilen
+                    contentBlock.lines()
+                        .drop(titleLineIndex + 1)
+                        .dropWhile { it.isBlank() }
+                        .joinToString("\n")
+                        .trim()
+                } else {
+                    // Fallback: Gesamter Content (kein Titel gefunden)
+                    contentBlock.trim()
+                }
+                
+                val content: String
+                val checklistItems: List<ChecklistItem>?
+                
+                if (noteType == NoteType.CHECKLIST) {
+                    // Parse Checklist Items
+                    val checklistRegex = Regex("^- \\[([ xX])\\] (.*)$", RegexOption.MULTILINE)
+                    checklistItems = checklistRegex.findAll(contentAfterTitle).mapIndexed { index, matchResult ->
+                        ChecklistItem(
+                            id = UUID.randomUUID().toString(),
+                            text = matchResult.groupValues[2].trim(),
+                            isChecked = matchResult.groupValues[1].lowercase() == "x",
+                            order = index
+                        )
+                    }.toList().ifEmpty { null }
+                    content = "" // Checklisten haben keinen "content"
+                } else {
+                    content = contentAfterTitle
+                    checklistItems = null
+                }
+                
+                Note(
+                    id = metadata["id"] ?: UUID.randomUUID().toString(),
+                    title = title,
+                    content = content,
+                    createdAt = parseISO8601(metadata["created"] ?: ""),
+                    updatedAt = parseISO8601(metadata["updated"] ?: ""),
+                    deviceId = metadata["device"] ?: "desktop",
+                    syncStatus = SyncStatus.SYNCED,  // Annahme: Vom Server importiert
+                    noteType = noteType,
+                    checklistItems = checklistItems
+                )
+            } catch (e: Exception) {
+                Logger.w(TAG, "Failed to parse Markdown: ${e.message}")
+                null
+            }
+        }
+        
+        /**
+         * Formatiert Timestamp zu ISO8601 (Task #1.2.0-10)
+         * Format: 2024-12-21T18:00:00Z (UTC)
+         */
+        private fun formatISO8601(timestamp: Long): String {
+            val sdf = SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US)
+            sdf.timeZone = TimeZone.getTimeZone("UTC")
+            return sdf.format(Date(timestamp))
+        }
+        
+        /**
+         * Parst ISO8601 zurück zu Timestamp (Task #1.2.0-10)
+         * Fallback: Aktueller Timestamp bei Fehler
+         */
+        private fun parseISO8601(dateString: String): Long {
+            return try {
+                val sdf = SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US)
+                sdf.timeZone = TimeZone.getTimeZone("UTC")
+                sdf.parse(dateString)?.time ?: System.currentTimeMillis()
+            } catch (e: Exception) {
+                Logger.w(TAG, "Failed to parse ISO8601 date '$dateString': ${e.message}")
+                System.currentTimeMillis()  // Fallback
+            }
+        }
+    }
+}
+
+/**
+ * 🎨 v1.7.0: Note size classification for Staggered Grid Layout
+ */
+enum class NoteSize {
+    SMALL,  // Compact display (< 80 chars or ≤ 4 checklist items)
+    LARGE;  // Full-width display
+    
+    companion object {
+        const val SMALL_TEXT_THRESHOLD = 80  // Max characters for compact text note
+        const val SMALL_CHECKLIST_THRESHOLD = 4  // Max items for compact checklist
+    }
+}
+
+/**
+ * 🎨 v1.7.0: Determine note size for grid layout optimization
+ */
+fun Note.getSize(): NoteSize {
+    return when (noteType) {
+        NoteType.TEXT -> {
+            if (content.length < NoteSize.SMALL_TEXT_THRESHOLD) NoteSize.SMALL else NoteSize.LARGE
+        }
+        NoteType.CHECKLIST -> {
+            val itemCount = checklistItems?.size ?: 0
+            if (itemCount <= NoteSize.SMALL_CHECKLIST_THRESHOLD) NoteSize.SMALL else NoteSize.LARGE
         }
     }
 }

android/app/src/main/java/dev/dettmer/simplenotes/models/NoteType.kt

@@ -0,0 +1,11 @@
+package dev.dettmer.simplenotes.models
+
+/**
+ * Definiert die verschiedenen Notiz-Typen
+ * 
+ * v1.4.0: Checklisten-Feature
+ */
+enum class NoteType {
+    TEXT,       // Normale Text-Notiz (Standard)
+    CHECKLIST   // Checkliste mit abhakbaren Items
+}

android/app/src/main/java/dev/dettmer/simplenotes/storage/NotesStorage.kt

@@ -1,11 +1,18 @@
 package dev.dettmer.simplenotes.storage
 
 import android.content.Context
+import dev.dettmer.simplenotes.models.DeletionTracker
 import dev.dettmer.simplenotes.models.Note
+import dev.dettmer.simplenotes.utils.DeviceIdGenerator
+import dev.dettmer.simplenotes.utils.Logger
 import java.io.File
 
 class NotesStorage(private val context: Context) {
     
+    companion object {
+        private const val TAG = "NotesStorage"
+    }
+    
     private val notesDir: File = File(context.filesDir, "notes").apply {
         if (!exists()) mkdirs()
     }
@@ -34,19 +41,109 @@ class NotesStorage(private val context: Context) {
     
     fun deleteNote(id: String): Boolean {
         val file = File(notesDir, "$id.json")
-        return file.delete()
+        val deleted = file.delete()
+        
+        if (deleted) {
+            Logger.d(TAG, "🗑️ Deleted note: $id")
+            
+            // Track deletion to prevent zombie notes
+            val deviceId = DeviceIdGenerator.getDeviceId(context)
+            trackDeletion(id, deviceId)
+        }
+        
+        return deleted
     }
     
     fun deleteAllNotes(): Boolean {
         return try {
-            notesDir.listFiles()
-                ?.filter { it.extension == "json" }
-                ?.forEach { it.delete() }
+            val notes = loadAllNotes()
+            val deviceId = DeviceIdGenerator.getDeviceId(context)
+            
+            for (note in notes) {
+                deleteNote(note.id)  // Uses trackDeletion() automatically
+            }
+            
+            Logger.d(TAG, "🗑️ Deleted all notes (${notes.size} notes)")
             true
         } catch (e: Exception) {
+            Logger.e(TAG, "Failed to delete all notes", e)
             false
         }
     }
     
+    // === Deletion Tracking ===
+    
+    private fun getDeletionTrackerFile(): File {
+        return File(context.filesDir, "deleted_notes.json")
+    }
+    
+    fun loadDeletionTracker(): DeletionTracker {
+        val file = getDeletionTrackerFile()
+        if (!file.exists()) {
+            return DeletionTracker()
+        }
+        
+        return try {
+            val json = file.readText()
+            DeletionTracker.fromJson(json) ?: DeletionTracker()
+        } catch (e: Exception) {
+            Logger.e(TAG, "Failed to load deletion tracker", e)
+            DeletionTracker()
+        }
+    }
+    
+    fun saveDeletionTracker(tracker: DeletionTracker) {
+        try {
+            val file = getDeletionTrackerFile()
+            file.writeText(tracker.toJson())
+            
+            if (tracker.deletedNotes.size > 1000) {
+                Logger.w(TAG, "⚠️ Deletion tracker large: ${tracker.deletedNotes.size} entries")
+            }
+            
+            Logger.d(TAG, "✅ Deletion tracker saved (${tracker.deletedNotes.size} entries)")
+        } catch (e: Exception) {
+            Logger.e(TAG, "Failed to save deletion tracker", e)
+        }
+    }
+    
+    fun trackDeletion(noteId: String, deviceId: String) {
+        val tracker = loadDeletionTracker()
+        tracker.addDeletion(noteId, deviceId)
+        saveDeletionTracker(tracker)
+        Logger.d(TAG, "📝 Tracked deletion: $noteId")
+    }
+    
+    fun isNoteDeleted(noteId: String): Boolean {
+        val tracker = loadDeletionTracker()
+        return tracker.isDeleted(noteId)
+    }
+    
+    fun clearDeletionTracker() {
+        saveDeletionTracker(DeletionTracker())
+        Logger.d(TAG, "🗑️ Deletion tracker cleared")
+    }
+    
+    /**
+     * 🔄 v1.7.0: Reset all sync statuses to PENDING when server changes
+     * This ensures notes are uploaded to the new server on next sync
+     */
+    fun resetAllSyncStatusToPending(): Int {
+        val notes = loadAllNotes()
+        var updatedCount = 0
+        
+        notes.forEach { note ->
+            if (note.syncStatus == dev.dettmer.simplenotes.models.SyncStatus.SYNCED) {
+                val updatedNote = note.copy(syncStatus = dev.dettmer.simplenotes.models.SyncStatus.PENDING)
+                saveNote(updatedNote)
+                updatedCount++
+            }
+        }
+        
+        Logger.d(TAG, "🔄 Reset sync status for $updatedCount notes to PENDING")
+        return updatedCount
+    }
+
+    
     fun getNotesDir(): File = notesDir
 }

android/app/src/main/java/dev/dettmer/simplenotes/sync/BootReceiver.kt

@@ -9,6 +9,7 @@ import dev.dettmer.simplenotes.utils.Logger
 /**
  * BootReceiver: Startet WorkManager nach Device Reboot
  * CRITICAL: Ohne diesen Receiver funktioniert Auto-Sync nach Reboot NICHT!
+ * v1.6.0: Configurable trigger - checks KEY_SYNC_TRIGGER_BOOT
  */
 class BootReceiver : BroadcastReceiver() {
     
@@ -24,16 +25,22 @@ class BootReceiver : BroadcastReceiver() {
         
         Logger.d(TAG, "📱 BOOT_COMPLETED received")
         
-        // Prüfe ob Auto-Sync aktiviert ist
         val prefs = context.getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)
-        val autoSyncEnabled = prefs.getBoolean(Constants.KEY_AUTO_SYNC, false)
         
-        if (!autoSyncEnabled) {
-            Logger.d(TAG, "❌ Auto-sync disabled - not starting WorkManager")
+        // 🌟 v1.6.0: Check if Boot trigger is enabled
+        if (!prefs.getBoolean(Constants.KEY_SYNC_TRIGGER_BOOT, Constants.DEFAULT_TRIGGER_BOOT)) {
+            Logger.d(TAG, "⏭️ Boot sync disabled - not starting WorkManager")
             return
         }
         
-        Logger.d(TAG, "🚀 Auto-sync enabled - starting WorkManager")
+        // Check if server is configured
+        val serverUrl = prefs.getString(Constants.KEY_SERVER_URL, null)
+        if (serverUrl.isNullOrEmpty() || serverUrl == "http://" || serverUrl == "https://") {
+            Logger.d(TAG, "⏭️ Offline mode - not starting WorkManager")
+            return
+        }
+        
+        Logger.d(TAG, "🚀 Boot sync enabled - starting WorkManager")
         
         // WorkManager neu starten
         val networkMonitor = NetworkMonitor(context.applicationContext)

android/app/src/main/java/dev/dettmer/simplenotes/sync/NetworkMonitor.kt

@@ -68,15 +68,20 @@ class NetworkMonitor(private val context: Context) {
                     
                     lastConnectedNetworkId = currentNetworkId
                     
-                    // Auto-Sync check
-                    val autoSyncEnabled = prefs.getBoolean(Constants.KEY_AUTO_SYNC, false)
-                    Logger.d(TAG, "    Auto-Sync enabled: $autoSyncEnabled")
+                    // WiFi-Connect Trigger prüfen - NICHT KEY_AUTO_SYNC!
+                    // Der Callback ist registriert WEIL KEY_SYNC_TRIGGER_WIFI_CONNECT = true
+                    // Aber defensive Prüfung für den Fall, dass Settings sich geändert haben
+                    val wifiConnectEnabled = prefs.getBoolean(
+                        Constants.KEY_SYNC_TRIGGER_WIFI_CONNECT,
+                        Constants.DEFAULT_TRIGGER_WIFI_CONNECT
+                    )
+                    Logger.d(TAG, "    WiFi-Connect trigger enabled: $wifiConnectEnabled")
                     
-                    if (autoSyncEnabled) {
-                        Logger.d(TAG, "    ✅ Triggering WorkManager...")
+                    if (wifiConnectEnabled) {
+                        Logger.d(TAG, "    ✅ Triggering WiFi-Connect sync...")
                         triggerWifiConnectSync()
                     } else {
-                        Logger.d(TAG, "    ❌ Auto-sync disabled - not triggering")
+                        Logger.d(TAG, "    ⏭️ WiFi-Connect trigger disabled in settings")
                     }
                 } else {
                     Logger.d(TAG, "    ⚠️ Same WiFi network as before - ignoring (no network change)")
@@ -102,8 +107,22 @@ class NetworkMonitor(private val context: Context) {
     /**
      * Triggert WiFi-Connect Sync via WorkManager
      * WorkManager wacht App auf (funktioniert auch wenn App geschlossen!)
+     * v1.6.0: Configurable trigger - checks KEY_SYNC_TRIGGER_WIFI_CONNECT
      */
     private fun triggerWifiConnectSync() {
+        // 🌟 v1.6.0: Check if WiFi-Connect trigger is enabled
+        if (!prefs.getBoolean(Constants.KEY_SYNC_TRIGGER_WIFI_CONNECT, Constants.DEFAULT_TRIGGER_WIFI_CONNECT)) {
+            Logger.d(TAG, "⏭️ WiFi-Connect sync disabled - skipping")
+            return
+        }
+        
+        // Check if server is configured
+        val serverUrl = prefs.getString(Constants.KEY_SERVER_URL, null)
+        if (serverUrl.isNullOrEmpty() || serverUrl == "http://" || serverUrl == "https://") {
+            Logger.d(TAG, "⏭️ Offline mode - skipping WiFi-Connect sync")
+            return
+        }
+        
         Logger.d(TAG, "📡 Scheduling WiFi-Connect sync via WorkManager")
         
         // 🔥 WICHTIG: NetworkType.UNMETERED constraint!
@@ -126,30 +145,80 @@ class NetworkMonitor(private val context: Context) {
     
     /**
      * Startet WorkManager mit Network Constraints + NetworkCallback
+     * 
+     * 🆕 v1.7.0: Überarbeitete Logik - WiFi-Connect Trigger funktioniert UNABHÄNGIG von KEY_AUTO_SYNC
+     * - KEY_AUTO_SYNC + KEY_SYNC_TRIGGER_PERIODIC → Periodic Sync
+     * - KEY_SYNC_TRIGGER_WIFI_CONNECT → WiFi-Connect Trigger (unabhängig!)
      */
     fun startMonitoring() {
-        val autoSyncEnabled = prefs.getBoolean(Constants.KEY_AUTO_SYNC, false)
+        Logger.d(TAG, "🚀 NetworkMonitor.startMonitoring() called")
         
-        if (!autoSyncEnabled) {
-            Logger.d(TAG, "Auto-sync disabled - stopping all monitoring")
-            stopMonitoring()
-            return
+        val autoSyncEnabled = prefs.getBoolean(Constants.KEY_AUTO_SYNC, false)
+        val periodicEnabled = prefs.getBoolean(Constants.KEY_SYNC_TRIGGER_PERIODIC, Constants.DEFAULT_TRIGGER_PERIODIC)
+        val wifiConnectEnabled = prefs.getBoolean(Constants.KEY_SYNC_TRIGGER_WIFI_CONNECT, Constants.DEFAULT_TRIGGER_WIFI_CONNECT)
+        
+        Logger.d(TAG, "    Settings: autoSync=$autoSyncEnabled, periodic=$periodicEnabled, wifiConnect=$wifiConnectEnabled")
+        
+        // 1. Periodic Sync (nur wenn KEY_AUTO_SYNC UND KEY_SYNC_TRIGGER_PERIODIC aktiv)
+        if (autoSyncEnabled && periodicEnabled) {
+            Logger.d(TAG, "📅 Starting periodic sync...")
+            startPeriodicSync()
+        } else {
+            WorkManager.getInstance(context).cancelUniqueWork(AUTO_SYNC_WORK_NAME)
+            Logger.d(TAG, "⏭️ Periodic sync disabled (autoSync=$autoSyncEnabled, periodic=$periodicEnabled)")
         }
         
-        Logger.d(TAG, "🚀 Starting NetworkMonitor (WorkManager + WiFi Callback)")
-        
-        // 1. WorkManager für periodic sync
-        startPeriodicSync()
-        
-        // 2. NetworkCallback für WiFi-Connect Detection
+        // 2. WiFi-Connect Trigger (🆕 UNABHÄNGIG von KEY_AUTO_SYNC!)
+        if (wifiConnectEnabled) {
+            Logger.d(TAG, "📶 Starting WiFi monitoring...")
             startWifiMonitoring()
+        } else {
+            stopWifiMonitoring()
+            Logger.d(TAG, "⏭️ WiFi-Connect trigger disabled")
+        }
+        
+        // 3. Logging für Debug
+        if (!autoSyncEnabled && !wifiConnectEnabled) {
+            Logger.d(TAG, "🛑 No background triggers active")
+        }
+    }
+    
+    /**
+     * 🆕 v1.7.0: Stoppt nur WiFi-Monitoring, nicht den gesamten NetworkMonitor
+     */
+    @Suppress("SwallowedException")
+    private fun stopWifiMonitoring() {
+        try {
+            connectivityManager.unregisterNetworkCallback(networkCallback)
+            Logger.d(TAG, "🛑 WiFi NetworkCallback unregistered")
+        } catch (e: Exception) {
+            // Already unregistered - das ist OK
+            Logger.d(TAG, "    WiFi callback already unregistered")
+        }
     }
     
     /**
      * Startet WorkManager periodic sync
      * 🔥 Interval aus SharedPrefs konfigurierbar (15/30/60 min)
+     * v1.6.0: Configurable trigger - checks KEY_SYNC_TRIGGER_PERIODIC
      */
     private fun startPeriodicSync() {
+        // 🌟 v1.6.0: Check if Periodic trigger is enabled
+        if (!prefs.getBoolean(Constants.KEY_SYNC_TRIGGER_PERIODIC, Constants.DEFAULT_TRIGGER_PERIODIC)) {
+            Logger.d(TAG, "⏭️ Periodic sync disabled - skipping")
+            // Cancel existing periodic work if disabled
+            WorkManager.getInstance(context).cancelUniqueWork(AUTO_SYNC_WORK_NAME)
+            return
+        }
+        
+        // Check if server is configured
+        val serverUrl = prefs.getString(Constants.KEY_SERVER_URL, null)
+        if (serverUrl.isNullOrEmpty() || serverUrl == "http://" || serverUrl == "https://") {
+            Logger.d(TAG, "⏭️ Offline mode - skipping Periodic sync")
+            WorkManager.getInstance(context).cancelUniqueWork(AUTO_SYNC_WORK_NAME)
+            return
+        }
+        
         // 🔥 Interval aus SharedPrefs lesen
         val intervalMinutes = prefs.getLong(
             Constants.PREF_SYNC_INTERVAL_MINUTES,
@@ -227,7 +296,11 @@ class NetworkMonitor(private val context: Context) {
             if (isWifi) {
                 lastConnectedNetworkId = activeNetwork.toString()
                 Logger.d(TAG, "    ✅ Initial WiFi network: $lastConnectedNetworkId")
-                Logger.d(TAG, "    📡 WiFi already connected at startup - onAvailable() will only trigger on network change")
+                Logger.d(
+                    TAG,
+                    "    📡 WiFi already connected at startup - " +
+                        "onAvailable() will only trigger on network change"
+                )
             } else {
                 lastConnectedNetworkId = null
                 Logger.d(TAG, "    ⚠️ Not on WiFi at startup")
@@ -268,7 +341,7 @@ class NetworkMonitor(private val context: Context) {
             connectivityManager.unregisterNetworkCallback(networkCallback)
             Logger.d(TAG, "✅ WiFi monitoring stopped")
         } catch (e: Exception) {
-            // Already unregistered
+            Logger.w(TAG, "NetworkCallback already unregistered: ${e.message}")
         }
     }
 }

android/app/src/main/java/dev/dettmer/simplenotes/sync/SafeSardineWrapper.kt

@@ -0,0 +1,105 @@
+package dev.dettmer.simplenotes.sync
+
+import com.thegrizzlylabs.sardineandroid.DavResource
+import com.thegrizzlylabs.sardineandroid.Sardine
+import com.thegrizzlylabs.sardineandroid.impl.OkHttpSardine
+import dev.dettmer.simplenotes.utils.Logger
+import okhttp3.Credentials
+import okhttp3.OkHttpClient
+import okhttp3.Request
+import java.io.InputStream
+
+/**
+ * 🔧 v1.7.1: Wrapper für Sardine der Connection Leaks verhindert
+ *
+ * Hintergrund:
+ * - OkHttpSardine.exists() schließt den Response-Body nicht
+ * - Dies führt zu "connection leaked" Warnungen im Log
+ * - Kann bei vielen Requests zu Socket-Exhaustion führen
+ *
+ * Lösung:
+ * - Eigene exists()-Implementation mit korrektem Response-Cleanup
+ * - Preemptive Authentication um 401-Round-Trips zu vermeiden
+ *
+ * @see <a href="https://square.github.io/okhttp/4.x/okhttp/okhttp3/-response-body/">OkHttp Response Body Docs</a>
+ */
+class SafeSardineWrapper private constructor(
+    private val delegate: OkHttpSardine,
+    private val okHttpClient: OkHttpClient,
+    private val authHeader: String
+) : Sardine by delegate {
+
+    companion object {
+        private const val TAG = "SafeSardine"
+
+        /**
+         * Factory-Methode für SafeSardineWrapper
+         */
+        fun create(
+            okHttpClient: OkHttpClient,
+            username: String,
+            password: String
+        ): SafeSardineWrapper {
+            val delegate = OkHttpSardine(okHttpClient).apply {
+                setCredentials(username, password)
+            }
+            val authHeader = Credentials.basic(username, password)
+            return SafeSardineWrapper(delegate, okHttpClient, authHeader)
+        }
+    }
+
+    /**
+     * ✅ Sichere exists()-Implementation mit Response Cleanup
+     *
+     * Im Gegensatz zu OkHttpSardine.exists() wird hier:
+     * 1. Preemptive Auth-Header gesendet (kein 401 Round-Trip)
+     * 2. Response.use{} für garantiertes Cleanup verwendet
+     */
+    override fun exists(url: String): Boolean {
+        val request = Request.Builder()
+            .url(url)
+            .head()
+            .header("Authorization", authHeader)
+            .build()
+
+        return try {
+            okHttpClient.newCall(request).execute().use { response ->
+                val isSuccess = response.isSuccessful
+                Logger.d(TAG, "exists($url) → $isSuccess (${response.code})")
+                isSuccess
+            }
+        } catch (e: Exception) {
+            Logger.d(TAG, "exists($url) failed: ${e.message}")
+            false
+        }
+    }
+
+    /**
+     * ✅ Wrapper um get() mit Logging
+     *
+     * WICHTIG: Der zurückgegebene InputStream MUSS vom Caller geschlossen werden!
+     * Empfohlen: inputStream.bufferedReader().use { it.readText() }
+     */
+    override fun get(url: String): InputStream {
+        Logger.d(TAG, "get($url)")
+        return delegate.get(url)
+    }
+
+    /**
+     * ✅ Wrapper um list() mit Logging
+     */
+    override fun list(url: String): List<DavResource> {
+        Logger.d(TAG, "list($url)")
+        return delegate.list(url)
+    }
+
+    /**
+     * ✅ Wrapper um list(url, depth) mit Logging
+     */
+    override fun list(url: String, depth: Int): List<DavResource> {
+        Logger.d(TAG, "list($url, depth=$depth)")
+        return delegate.list(url, depth)
+    }
+
+    // Alle anderen Methoden werden automatisch durch 'by delegate' weitergeleitet
+}

android/app/src/main/java/dev/dettmer/simplenotes/sync/SyncStateManager.kt

@@ -0,0 +1,149 @@
+package dev.dettmer.simplenotes.sync
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import dev.dettmer.simplenotes.utils.Logger
+
+/**
+ * 🔄 v1.3.1: Zentrale Verwaltung des Sync-Status
+ * 
+ * Verhindert doppelte Syncs und informiert die UI über den aktuellen Status.
+ * Thread-safe Singleton mit LiveData für UI-Reaktivität.
+ */
+object SyncStateManager {
+    
+    private const val TAG = "SyncStateManager"
+    
+    /**
+     * Mögliche Sync-Zustände
+     */
+    enum class SyncState {
+        IDLE,           // Kein Sync aktiv
+        SYNCING,        // Sync läuft gerade (Banner sichtbar)
+        SYNCING_SILENT, // v1.5.0: Sync läuft im Hintergrund (kein Banner, z.B. onResume)
+        COMPLETED,      // Sync erfolgreich abgeschlossen (kurz anzeigen)
+        ERROR           // Sync fehlgeschlagen (kurz anzeigen)
+    }
+    
+    /**
+     * Detaillierte Sync-Informationen für UI
+     */
+    data class SyncStatus(
+        val state: SyncState = SyncState.IDLE,
+        val message: String? = null,
+        val source: String? = null,  // "manual", "auto", "pullToRefresh", "background"
+        val silent: Boolean = false, // v1.5.0: Wenn true, wird nach Completion kein Banner angezeigt
+        val timestamp: Long = System.currentTimeMillis()
+    )
+    
+    // Private mutable LiveData
+    private val _syncStatus = MutableLiveData(SyncStatus())
+    
+    // Public immutable LiveData für Observer
+    val syncStatus: LiveData<SyncStatus> = _syncStatus
+    
+    // Lock für Thread-Sicherheit
+    private val lock = Any()
+    
+    /**
+     * Prüft ob gerade ein Sync läuft (inkl. Silent-Sync)
+     */
+    val isSyncing: Boolean
+        get() {
+            val state = _syncStatus.value?.state
+            return state == SyncState.SYNCING || state == SyncState.SYNCING_SILENT
+        }
+    
+    /**
+     * Versucht einen Sync zu starten.
+     * @param source Quelle des Syncs (für Logging)
+     * @param silent v1.5.0: Wenn true, wird kein Banner angezeigt (z.B. bei onResume Auto-Sync)
+     * @return true wenn Sync gestartet werden kann, false wenn bereits einer läuft
+     */
+    fun tryStartSync(source: String, silent: Boolean = false): Boolean {
+        synchronized(lock) {
+            if (isSyncing) {
+                Logger.d(TAG, "⚠️ Sync already in progress, rejecting new sync from: $source")
+                return false
+            }
+            
+            val syncState = if (silent) SyncState.SYNCING_SILENT else SyncState.SYNCING
+            Logger.d(TAG, "🔄 Starting sync from: $source (silent=$silent)")
+            _syncStatus.postValue(
+                SyncStatus(
+                    state = syncState,
+                    message = "Synchronisiere...",
+                    source = source,
+                    silent = silent  // v1.5.0: Merkt sich ob silent für markCompleted()
+                )
+            )
+            return true
+        }
+    }
+    
+    /**
+     * Markiert Sync als erfolgreich abgeschlossen
+     * v1.5.0: Bei Silent-Sync direkt auf IDLE wechseln (kein Banner)
+     */
+    fun markCompleted(message: String? = null) {
+        synchronized(lock) {
+            val current = _syncStatus.value
+            val currentSource = current?.source
+            val wasSilent = current?.silent == true
+            
+            Logger.d(TAG, "✅ Sync completed from: $currentSource (silent=$wasSilent)")
+            
+            if (wasSilent) {
+                // v1.5.0: Silent-Sync - direkt auf IDLE, kein Banner anzeigen
+                _syncStatus.postValue(SyncStatus())
+            } else {
+                // Normaler Sync - COMPLETED State anzeigen
+                _syncStatus.postValue(
+                    SyncStatus(
+                        state = SyncState.COMPLETED,
+                        message = message,
+                        source = currentSource
+                    )
+                )
+            }
+        }
+    }
+    
+    /**
+     * Markiert Sync als fehlgeschlagen
+     */
+    fun markError(errorMessage: String?) {
+        synchronized(lock) {
+            val currentSource = _syncStatus.value?.source
+            Logger.e(TAG, "❌ Sync failed from: $currentSource - $errorMessage")
+            _syncStatus.postValue(
+                SyncStatus(
+                    state = SyncState.ERROR,
+                    message = errorMessage,
+                    source = currentSource
+                )
+            )
+        }
+    }
+    
+    /**
+     * Setzt Status zurück auf IDLE
+     */
+    fun reset() {
+        synchronized(lock) {
+            _syncStatus.postValue(SyncStatus())
+        }
+    }
+    
+    /**
+     * Aktualisiert die Nachricht während des Syncs (z.B. Progress)
+     */
+    fun updateMessage(message: String) {
+        synchronized(lock) {
+            val current = _syncStatus.value ?: return
+            if (current.state == SyncState.SYNCING) {
+                _syncStatus.postValue(current.copy(message = message))
+            }
+        }
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/sync/SyncWorker.kt

@@ -1,13 +1,21 @@
+@file:Suppress("DEPRECATION") // LocalBroadcastManager deprecated but functional, will migrate in v2.0.0
+
 package dev.dettmer.simplenotes.sync
 
+import android.app.ActivityManager
 import android.content.Context
 import android.content.Intent
+import android.content.pm.ServiceInfo
+import android.os.Build
 import androidx.localbroadcastmanager.content.LocalBroadcastManager
 import androidx.work.CoroutineWorker
+import androidx.work.ForegroundInfo
 import androidx.work.WorkerParameters
 import dev.dettmer.simplenotes.BuildConfig
+import dev.dettmer.simplenotes.utils.Constants
 import dev.dettmer.simplenotes.utils.Logger
 import dev.dettmer.simplenotes.utils.NotificationHelper
+import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 
@@ -21,6 +29,50 @@ class SyncWorker(
         const val ACTION_SYNC_COMPLETED = "dev.dettmer.simplenotes.SYNC_COMPLETED"
     }
     
+    /**
+     * 🔧 v1.7.2: Required for expedited work on Android 9-11
+     * 
+     * WorkManager ruft diese Methode auf um die Foreground-Notification zu erstellen
+     * wenn der Worker als Expedited Work gestartet wird.
+     * 
+     * Ab Android 12+ wird diese Methode NICHT aufgerufen (neue Expedited API).
+     * Auf Android 9-11 MUSS diese Methode implementiert sein!
+     * 
+     * @see https://developer.android.com/develop/background-work/background-tasks/persistent/getting-started/define-work#foregroundinfo
+     */
+    override suspend fun getForegroundInfo(): ForegroundInfo {
+        val notification = NotificationHelper.createSyncProgressNotification(applicationContext)
+        
+        // Android 10+ benötigt foregroundServiceType
+        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+            ForegroundInfo(
+                NotificationHelper.SYNC_PROGRESS_NOTIFICATION_ID,
+                notification,
+                ServiceInfo.FOREGROUND_SERVICE_TYPE_DATA_SYNC
+            )
+        } else {
+            ForegroundInfo(
+                NotificationHelper.SYNC_PROGRESS_NOTIFICATION_ID,
+                notification
+            )
+        }
+    }
+    
+    /**
+     * Prüft ob die App im Vordergrund ist.
+     * Wenn ja, brauchen wir keine Benachrichtigung - die UI zeigt die Änderungen direkt.
+     */
+    private fun isAppInForeground(): Boolean {
+        val activityManager = applicationContext.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager
+        val appProcesses = activityManager.runningAppProcesses ?: return false
+        val packageName = applicationContext.packageName
+        
+        return appProcesses.any { process ->
+            process.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND &&
+            process.processName == packageName
+        }
+    }
+    
     override suspend fun doWork(): Result = withContext(Dispatchers.IO) {
         if (BuildConfig.DEBUG) {
             Logger.d(TAG, "═══════════════════════════════════════")
@@ -52,7 +104,70 @@ class SyncWorker(
             }
             
             if (BuildConfig.DEBUG) {
-                Logger.d(TAG, "📍 Step 2: Before syncNotes() call")
+                Logger.d(TAG, "📍 Step 2: Checking for unsynced changes (Performance Pre-Check)")
+            }
+            
+            // 🔥 v1.1.2: Performance-Optimierung - Skip Sync wenn keine lokalen Änderungen
+            // Spart Batterie + Netzwerk-Traffic + Server-Last
+            if (!syncService.hasUnsyncedChanges()) {
+                Logger.d(TAG, "⏭️ No local changes - skipping sync (performance optimization)")
+                Logger.d(TAG, "   Saves battery, network traffic, and server load")
+                
+                if (BuildConfig.DEBUG) {
+                    Logger.d(TAG, "✅ SyncWorker.doWork() SUCCESS (no changes to sync)")
+                    Logger.d(TAG, "═══════════════════════════════════════")
+                }
+                
+                return@withContext Result.success()
+            }
+            
+            if (BuildConfig.DEBUG) {
+                Logger.d(TAG, "📍 Step 2.5: Checking sync gate (canSync)")
+            }
+            
+            // 🆕 v1.7.0: Zentrale Sync-Gate Prüfung (WiFi-Only, Offline Mode, Server Config)
+            val gateResult = syncService.canSync()
+            if (!gateResult.canSync) {
+                if (gateResult.isBlockedByWifiOnly) {
+                    Logger.d(TAG, "⏭️ WiFi-only mode enabled, but not on WiFi - skipping sync")
+                } else {
+                    Logger.d(TAG, "⏭️ Sync blocked by gate: ${gateResult.blockReason ?: "offline/no server"}")
+                }
+                
+                if (BuildConfig.DEBUG) {
+                    Logger.d(TAG, "✅ SyncWorker.doWork() SUCCESS (gate blocked)")
+                    Logger.d(TAG, "═══════════════════════════════════════")
+                }
+                
+                return@withContext Result.success()
+            }
+            
+            if (BuildConfig.DEBUG) {
+                Logger.d(TAG, "📍 Step 3: Checking server reachability (Pre-Check)")
+            }
+            
+            // ⭐ KRITISCH: Server-Erreichbarkeits-Check VOR Sync
+            // Verhindert Fehler-Notifications in fremden WiFi-Netzen
+            // Wartet bis Netzwerk bereit ist (DHCP, Routing, Gateway)
+            if (!syncService.isServerReachable()) {
+                Logger.d(TAG, "⏭️ Server not reachable - skipping sync (no error)")
+                Logger.d(TAG, "   Reason: Server offline/wrong network/network not ready/not configured")
+                Logger.d(TAG, "   This is normal in foreign WiFi or during network initialization")
+                
+                // 🔥 v1.1.2: Check if we should show warning (server unreachable for >24h)
+                checkAndShowSyncWarning(syncService)
+                
+                if (BuildConfig.DEBUG) {
+                    Logger.d(TAG, "✅ SyncWorker.doWork() SUCCESS (silent skip)")
+                    Logger.d(TAG, "═══════════════════════════════════════")
+                }
+                
+                // Success zurückgeben (kein Fehler, Server ist halt nicht erreichbar)
+                return@withContext Result.success()
+            }
+            
+            if (BuildConfig.DEBUG) {
+                Logger.d(TAG, "📍 Step 3: Server reachable - proceeding with sync")
                 Logger.d(TAG, "    SyncService: $syncService")
             }
             
@@ -73,18 +188,27 @@ class SyncWorker(
             }
             
             if (BuildConfig.DEBUG) {
-                Logger.d(TAG, "📍 Step 3: Processing result")
-                Logger.d(TAG, "📦 Sync result: success=${result.isSuccess}, count=${result.syncedCount}, error=${result.errorMessage}")
+                Logger.d(TAG, "📍 Step 4: Processing result")
+                Logger.d(
+                    TAG,
+                    "📦 Sync result: success=${result.isSuccess}, " +
+                        "count=${result.syncedCount}, error=${result.errorMessage}"
+                )
             }
             
             if (result.isSuccess) {
                 if (BuildConfig.DEBUG) {
-                    Logger.d(TAG, "📍 Step 4: Success path")
+                    Logger.d(TAG, "📍 Step 5: Success path")
                 }
                 Logger.i(TAG, "✅ Sync successful: ${result.syncedCount} notes")
                 
                 // Nur Notification zeigen wenn tatsächlich etwas gesynct wurde
+                // UND die App nicht im Vordergrund ist (sonst sieht User die Änderungen direkt)
                 if (result.syncedCount > 0) {
+                    val appInForeground = isAppInForeground()
+                    if (appInForeground) {
+                        Logger.d(TAG, "ℹ️ App in foreground - skipping notification (UI shows changes)")
+                    } else {
                         if (BuildConfig.DEBUG) {
                             Logger.d(TAG, "    Showing success notification...")
                         }
@@ -92,6 +216,7 @@ class SyncWorker(
                             applicationContext,
                             result.syncedCount
                         )
+                    }
                 } else {
                     Logger.d(TAG, "ℹ️ No changes to sync - no notification")
                 }
@@ -109,7 +234,7 @@ class SyncWorker(
                 Result.success()
             } else {
                 if (BuildConfig.DEBUG) {
-                    Logger.d(TAG, "📍 Step 4: Failure path")
+                    Logger.d(TAG, "📍 Step 5: Failure path")
                 }
                 Logger.e(TAG, "❌ Sync failed: ${result.errorMessage}")
                 NotificationHelper.showSyncError(
@@ -126,6 +251,32 @@ class SyncWorker(
                 }
                 Result.failure()
             }
+        } catch (e: CancellationException) {
+            // ⭐ Job wurde gecancelt - KEIN FEHLER!
+            // Gründe: App-Update, Doze Mode, Battery Optimization, Network Constraint, etc.
+            if (BuildConfig.DEBUG) {
+                Logger.d(TAG, "═══════════════════════════════════════")
+            }
+            Logger.d(TAG, "⏹️ Job was cancelled (normal - update/doze/constraints)")
+            Logger.d(TAG, "   Reason could be: App update, Doze mode, Battery opt, Network disconnect")
+            Logger.d(TAG, "   This is expected Android behavior - not an error!")
+            
+            try {
+                // UI-Refresh trotzdem triggern (falls MainActivity geöffnet)
+                broadcastSyncCompleted(false, 0)
+            } catch (broadcastError: Exception) {
+                Logger.e(TAG, "Failed to broadcast after cancellation", broadcastError)
+            }
+            
+            if (BuildConfig.DEBUG) {
+                Logger.d(TAG, "✅ SyncWorker.doWork() SUCCESS (cancelled, no error)")
+                Logger.d(TAG, "═══════════════════════════════════════")
+            }
+            
+            // ⚠️ WICHTIG: Result.success() zurückgeben!
+            // Cancellation ist KEIN Fehler, WorkManager soll nicht retries machen
+            Result.success()
+            
         } catch (e: Exception) {
             if (BuildConfig.DEBUG) {
                 Logger.d(TAG, "═══════════════════════════════════════")
@@ -160,6 +311,7 @@ class SyncWorker(
     /**
      * Sendet Broadcast an MainActivity für UI Refresh
      */
+    @Suppress("DEPRECATION") // LocalBroadcastManager deprecated but still functional, will migrate in v2.0.0
     private fun broadcastSyncCompleted(success: Boolean, count: Int) {
         val intent = Intent(ACTION_SYNC_COMPLETED).apply {
             putExtra("success", success)
@@ -168,4 +320,69 @@ class SyncWorker(
         LocalBroadcastManager.getInstance(applicationContext).sendBroadcast(intent)
         Logger.d(TAG, "📡 Broadcast sent: success=$success, count=$count")
     }
+    
+    /**
+     * Prüft ob Server längere Zeit unreachable und zeigt ggf. Warnung (v1.1.2)
+     * - Nur wenn Auto-Sync aktiviert
+     * - Nur wenn schon mal erfolgreich gesynct
+     * - Nur wenn >24h seit letztem erfolgreichen Sync
+     * - Throttling: Max. 1 Warnung pro 24h
+     */
+    private fun checkAndShowSyncWarning(syncService: WebDavSyncService) {
+        try {
+            val prefs = applicationContext.getSharedPreferences(
+                dev.dettmer.simplenotes.utils.Constants.PREFS_NAME,
+                android.content.Context.MODE_PRIVATE
+            )
+            
+            // Check 1: Auto-Sync aktiviert?
+            val autoSyncEnabled = prefs.getBoolean(
+                dev.dettmer.simplenotes.utils.Constants.KEY_AUTO_SYNC,
+                false
+            )
+            if (!autoSyncEnabled) {
+                Logger.d(TAG, "⏭️ Auto-Sync disabled - no warning needed")
+                return
+            }
+            
+            // Check 2: Schon mal erfolgreich gesynct?
+            val lastSuccessfulSync = syncService.getLastSuccessfulSyncTimestamp()
+            if (lastSuccessfulSync == 0L) {
+                Logger.d(TAG, "⏭️ Never synced successfully - no warning needed")
+                return
+            }
+            
+            // Check 3: >24h seit letztem erfolgreichen Sync?
+            val now = System.currentTimeMillis()
+            val timeSinceLastSync = now - lastSuccessfulSync
+            if (timeSinceLastSync < dev.dettmer.simplenotes.utils.Constants.SYNC_WARNING_THRESHOLD_MS) {
+                Logger.d(TAG, "⏭️ Last successful sync <24h ago - no warning needed")
+                return
+            }
+            
+            // Check 4: Throttling - schon Warnung in letzten 24h gezeigt?
+            val lastWarningShown = prefs.getLong(
+                dev.dettmer.simplenotes.utils.Constants.KEY_LAST_SYNC_WARNING_SHOWN,
+                0L
+            )
+            if (now - lastWarningShown < dev.dettmer.simplenotes.utils.Constants.SYNC_WARNING_THRESHOLD_MS) {
+                Logger.d(TAG, "⏭️ Warning already shown in last 24h - throttling")
+                return
+            }
+            
+            // Zeige Warnung
+            val hoursSinceLastSync = timeSinceLastSync / (1000 * 60 * 60)
+            NotificationHelper.showSyncWarning(applicationContext, hoursSinceLastSync)
+            
+            // Speichere Zeitpunkt der Warnung
+            prefs.edit()
+                .putLong(dev.dettmer.simplenotes.utils.Constants.KEY_LAST_SYNC_WARNING_SHOWN, now)
+                .apply()
+            
+            Logger.d(TAG, "⚠️ Sync warning shown: Server unreachable for ${hoursSinceLastSync}h")
+            
+        } catch (e: Exception) {
+            Logger.e(TAG, "Failed to check/show sync warning", e)
+        }
+    }
 }

android/app/src/main/java/dev/dettmer/simplenotes/sync/WifiSyncReceiver.kt

@@ -5,12 +5,17 @@ import android.content.Context
 import android.content.Intent
 import android.net.ConnectivityManager
 import android.net.NetworkCapabilities
-import android.net.wifi.WifiManager
 import androidx.work.OneTimeWorkRequestBuilder
 import androidx.work.WorkManager
 import dev.dettmer.simplenotes.utils.Constants
 import java.util.concurrent.TimeUnit
 
+/**
+ * WiFi-Sync BroadcastReceiver
+ * 
+ * Triggert Sync wenn WiFi verbunden wird (jedes WiFi, keine SSID-Prüfung mehr)
+ * Die eigentliche Server-Erreichbarkeitsprüfung erfolgt im SyncWorker.
+ */
 class WifiSyncReceiver : BroadcastReceiver() {
     
     override fun onReceive(context: Context, intent: Intent) {
@@ -22,33 +27,24 @@ class WifiSyncReceiver : BroadcastReceiver() {
             return
         }
         
-        // Check if connected to home WiFi
-        if (isConnectedToHomeWifi(context)) {
+        // Check if connected to any WiFi (SSID-Prüfung entfernt in v1.4.0)
+        if (isConnectedToWifi(context)) {
             scheduleSyncWork(context)
         }
     }
     
-    private fun isConnectedToHomeWifi(context: Context): Boolean {
-        val prefs = context.getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)
-        val homeSSID = prefs.getString(Constants.KEY_HOME_SSID, null) ?: return false
-        
+    /**
+     * Prüft ob ein WiFi-Netzwerk verbunden ist (beliebiges WiFi)
+     * Die Server-Erreichbarkeitsprüfung erfolgt erst im SyncWorker.
+     */
+    private fun isConnectedToWifi(context: Context): Boolean {
         val connectivityManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) 
             as ConnectivityManager
         
         val network = connectivityManager.activeNetwork ?: return false
         val capabilities = connectivityManager.getNetworkCapabilities(network) ?: return false
         
-        if (!capabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)) {
-            return false
-        }
-        
-        // Get current SSID
-        val wifiManager = context.applicationContext.getSystemService(Context.WIFI_SERVICE) 
-            as WifiManager
-        val wifiInfo = wifiManager.connectionInfo
-        val currentSSID = wifiInfo.ssid.replace("\"", "")
-        
-        return currentSSID == homeSSID
+        return capabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI)
     }
     
     private fun scheduleSyncWork(context: Context) {

android/app/src/main/java/dev/dettmer/simplenotes/ui/editor/ComposeNoteEditorActivity.kt

@@ -0,0 +1,106 @@
+@file:Suppress("DEPRECATION") // AbstractSavedStateViewModelFactory deprecated, will migrate to viewModelFactory in v2.0.0
+
+package dev.dettmer.simplenotes.ui.editor
+
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.OnBackPressedCallback
+import androidx.activity.compose.setContent
+import androidx.activity.enableEdgeToEdge
+import androidx.activity.viewModels
+import androidx.lifecycle.AbstractSavedStateViewModelFactory
+import androidx.lifecycle.SavedStateHandle
+import androidx.lifecycle.ViewModel
+import androidx.savedstate.SavedStateRegistryOwner
+import com.google.android.material.color.DynamicColors
+import dev.dettmer.simplenotes.models.NoteType
+import dev.dettmer.simplenotes.ui.theme.SimpleNotesTheme
+
+/**
+ * Compose-based Note Editor Activity
+ * 
+ * v1.5.0: Jetpack Compose NoteEditor Redesign
+ * Replaces the old NoteEditorActivity with a modern Compose implementation.
+ * 
+ * Supports:
+ * - TEXT notes with title and content
+ * - CHECKLIST notes with drag & drop reordering
+ * - Auto-keyboard focus for new checklist items
+ */
+class ComposeNoteEditorActivity : ComponentActivity() {
+    
+    companion object {
+        const val EXTRA_NOTE_ID = "extra_note_id"
+        const val EXTRA_NOTE_TYPE = "extra_note_type"
+    }
+    
+    private val viewModel: NoteEditorViewModel by viewModels {
+        NoteEditorViewModelFactory(
+            application = application,
+            owner = this,
+            noteId = intent.getStringExtra(EXTRA_NOTE_ID),
+            noteType = intent.getStringExtra(EXTRA_NOTE_TYPE) ?: NoteType.TEXT.name
+        )
+    }
+    
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        
+        // Apply Dynamic Colors for Android 12+ (Material You)
+        DynamicColors.applyToActivityIfAvailable(this)
+        
+        enableEdgeToEdge()
+        
+        // v1.5.0: Handle back button with slide animation
+        onBackPressedDispatcher.addCallback(this, object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+                finish()
+                @Suppress("DEPRECATION")
+                overridePendingTransition(
+                    dev.dettmer.simplenotes.R.anim.slide_in_left,
+                    dev.dettmer.simplenotes.R.anim.slide_out_right
+                )
+            }
+        })
+        
+        setContent {
+            SimpleNotesTheme {
+                NoteEditorScreen(
+                    viewModel = viewModel,
+                    onNavigateBack = {
+                        finish()
+                        @Suppress("DEPRECATION")
+                        overridePendingTransition(
+                            dev.dettmer.simplenotes.R.anim.slide_in_left,
+                            dev.dettmer.simplenotes.R.anim.slide_out_right
+                        )
+                    }
+                )
+            }
+        }
+    }
+}
+
+/**
+ * Custom ViewModelFactory to pass SavedStateHandle with intent extras
+ */
+class NoteEditorViewModelFactory(
+    private val application: android.app.Application,
+    owner: SavedStateRegistryOwner,
+    private val noteId: String?,
+    private val noteType: String
+) : AbstractSavedStateViewModelFactory(owner, null) {
+    
+    @Suppress("UNCHECKED_CAST")
+    override fun <T : ViewModel> create(
+        key: String,
+        modelClass: Class<T>,
+        handle: SavedStateHandle
+    ): T {
+        // Populate SavedStateHandle with intent extras
+        handle[NoteEditorViewModel.ARG_NOTE_ID] = noteId
+        handle[NoteEditorViewModel.ARG_NOTE_TYPE] = noteType
+        
+        return NoteEditorViewModel(application, handle) as T
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/editor/DragDropListState.kt

@@ -0,0 +1,154 @@
+package dev.dettmer.simplenotes.ui.editor
+
+import androidx.compose.foundation.gestures.detectDragGesturesAfterLongPress
+import androidx.compose.foundation.gestures.scrollBy
+import androidx.compose.foundation.lazy.LazyListItemInfo
+import androidx.compose.foundation.lazy.LazyListState
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableFloatStateOf
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.input.pointer.pointerInput
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.launch
+
+/**
+ * FOSS Drag & Drop State für LazyList
+ * 
+ * Native Compose-Implementierung ohne externe Dependencies
+ * v1.5.0: NoteEditor Redesign
+ */
+class DragDropListState(
+    private val state: LazyListState,
+    private val scope: CoroutineScope,
+    private val onMove: (Int, Int) -> Unit
+) {
+    var draggingItemIndex by mutableStateOf<Int?>(null)
+        private set
+
+    private var draggingItemDraggedDelta by mutableFloatStateOf(0f)
+    private var draggingItemInitialOffset by mutableFloatStateOf(0f)
+    private var overscrollJob by mutableStateOf<Job?>(null)
+
+    val draggingItemOffset: Float
+        get() = draggingItemLayoutInfo?.let { item ->
+            draggingItemInitialOffset + draggingItemDraggedDelta - item.offset
+        } ?: 0f
+
+    private val draggingItemLayoutInfo: LazyListItemInfo?
+        get() = state.layoutInfo.visibleItemsInfo
+            .firstOrNull { it.index == draggingItemIndex }
+
+    fun onDragStart(offset: Offset, itemIndex: Int) {
+        draggingItemIndex = itemIndex
+        draggingItemInitialOffset = draggingItemLayoutInfo?.offset?.toFloat() ?: 0f
+        draggingItemDraggedDelta = 0f
+    }
+
+    fun onDragInterrupted() {
+        draggingItemDraggedDelta = 0f
+        draggingItemIndex = null
+        draggingItemInitialOffset = 0f
+        overscrollJob?.cancel()
+    }
+
+    fun onDrag(offset: Offset) {
+        draggingItemDraggedDelta += offset.y
+
+        val draggingItem = draggingItemLayoutInfo ?: return
+        val startOffset = draggingItem.offset + draggingItemOffset
+        val endOffset = startOffset + draggingItem.size
+
+        val middleOffset = startOffset + (endOffset - startOffset) / 2f
+
+        val targetItem = state.layoutInfo.visibleItemsInfo.find { item ->
+            middleOffset.toInt() in item.offset..item.offsetEnd &&
+                draggingItem.index != item.index
+        }
+
+        if (targetItem != null) {
+            val scrollToIndex = if (targetItem.index == state.firstVisibleItemIndex) {
+                draggingItem.index
+            } else if (draggingItem.index == state.firstVisibleItemIndex) {
+                targetItem.index
+            } else {
+                null
+            }
+            
+            if (scrollToIndex != null) {
+                scope.launch {
+                    state.scrollToItem(scrollToIndex, state.firstVisibleItemScrollOffset)
+                    onMove(draggingItem.index, targetItem.index)
+                }
+            } else {
+                onMove(draggingItem.index, targetItem.index)
+            }
+            
+            draggingItemIndex = targetItem.index
+        } else {
+            val overscroll = when {
+                draggingItemDraggedDelta > 0 ->
+                    (endOffset - state.layoutInfo.viewportEndOffset).coerceAtLeast(0f)
+                draggingItemDraggedDelta < 0 ->
+                    (startOffset - state.layoutInfo.viewportStartOffset).coerceAtMost(0f)
+                else -> 0f
+            }
+
+            if (overscroll != 0f) {
+                if (overscrollJob?.isActive != true) {
+                    overscrollJob = scope.launch {
+                        state.scrollBy(overscroll)
+                    }
+                }
+            } else {
+                overscrollJob?.cancel()
+            }
+        }
+    }
+
+    private val LazyListItemInfo.offsetEnd: Int
+        get() = this.offset + this.size
+}
+
+@Composable
+fun rememberDragDropListState(
+    lazyListState: LazyListState,
+    scope: CoroutineScope,
+    onMove: (Int, Int) -> Unit
+): DragDropListState {
+    return remember(lazyListState, scope) {
+        DragDropListState(
+            state = lazyListState,
+            scope = scope,
+            onMove = onMove
+        )
+    }
+}
+
+fun Modifier.dragContainer(
+    dragDropState: DragDropListState,
+    itemIndex: Int
+): Modifier {
+    return this.pointerInput(dragDropState) {
+        detectDragGesturesAfterLongPress(
+            onDragStart = { offset ->
+                dragDropState.onDragStart(offset, itemIndex)
+            },
+            onDragEnd = {
+                dragDropState.onDragInterrupted()
+            },
+            onDragCancel = {
+                dragDropState.onDragInterrupted()
+            },
+            onDrag = { change, offset ->
+                change.consume()
+                dragDropState.onDrag(offset)
+            }
+        )
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/editor/NoteEditorScreen.kt

@@ -0,0 +1,386 @@
+package dev.dettmer.simplenotes.ui.editor
+
+import androidx.compose.animation.core.animateDpAsState
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.imePadding
+import androidx.compose.foundation.layout.offset
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.itemsIndexed
+import androidx.compose.foundation.lazy.rememberLazyListState
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material.icons.filled.Add
+import androidx.compose.material.icons.filled.Delete
+import androidx.compose.material.icons.filled.Save
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.material3.TopAppBar
+import androidx.compose.material3.TopAppBarDefaults
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.shadow
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.text.TextRange
+import androidx.compose.ui.text.input.TextFieldValue
+import androidx.compose.ui.focus.focusRequester
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalSoftwareKeyboardController
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.IntOffset
+import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.models.NoteType
+import dev.dettmer.simplenotes.ui.editor.components.ChecklistItemRow
+import dev.dettmer.simplenotes.ui.main.components.DeleteConfirmationDialog
+import kotlinx.coroutines.delay
+import dev.dettmer.simplenotes.utils.showToast
+import kotlin.math.roundToInt
+
+/**
+ * Main Composable for the Note Editor screen.
+ * 
+ * v1.5.0: Jetpack Compose NoteEditor Redesign
+ * - Supports both TEXT and CHECKLIST notes
+ * - Drag & Drop reordering for checklist items
+ * - Auto-keyboard focus for new items
+ */
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun NoteEditorScreen(
+    viewModel: NoteEditorViewModel,
+    onNavigateBack: () -> Unit
+) {
+    val context = LocalContext.current
+    val uiState by viewModel.uiState.collectAsState()
+    val checklistItems by viewModel.checklistItems.collectAsState()
+    
+    // 🌟 v1.6.0: Offline mode state
+    val isOfflineMode by viewModel.isOfflineMode.collectAsState()
+    
+    var showDeleteDialog by remember { mutableStateOf(false) }
+    var focusNewItemId by remember { mutableStateOf<String?>(null) }
+    val scope = rememberCoroutineScope()
+    
+    // Strings for toast messages (avoid LocalContextGetResourceValueCall lint)
+    val msgNoteIsEmpty = stringResource(R.string.note_is_empty)
+    val msgNoteSaved = stringResource(R.string.note_saved)
+    val msgNoteDeleted = stringResource(R.string.note_deleted)
+    
+    // v1.5.0: Auto-keyboard support
+    val keyboardController = LocalSoftwareKeyboardController.current
+    val titleFocusRequester = remember { FocusRequester() }
+    val contentFocusRequester = remember { FocusRequester() }
+    
+    // v1.5.0: Auto-focus and show keyboard
+    LaunchedEffect(uiState.isNewNote, uiState.noteType) {
+        delay(100) // Wait for layout
+        when {
+            uiState.isNewNote -> {
+                // New note: focus title
+                titleFocusRequester.requestFocus()
+                keyboardController?.show()
+            }
+            !uiState.isNewNote && uiState.noteType == NoteType.TEXT -> {
+                // Editing text note: focus content
+                contentFocusRequester.requestFocus()
+                keyboardController?.show()
+            }
+        }
+    }
+    
+    // Handle events
+    LaunchedEffect(Unit) {
+        viewModel.events.collect { event ->
+            when (event) {
+                is NoteEditorEvent.ShowToast -> {
+                    val message = when (event.message) {
+                        ToastMessage.NOTE_IS_EMPTY -> msgNoteIsEmpty
+                        ToastMessage.NOTE_SAVED -> msgNoteSaved
+                        ToastMessage.NOTE_DELETED -> msgNoteDeleted
+                    }
+                    context.showToast(message)
+                }
+                is NoteEditorEvent.NavigateBack -> onNavigateBack()
+                is NoteEditorEvent.ShowDeleteConfirmation -> showDeleteDialog = true
+            }
+        }
+    }
+    
+    Scaffold(
+        topBar = {
+            TopAppBar(
+                title = {
+                    Text(
+                        text = when (uiState.toolbarTitle) {
+                            ToolbarTitle.NEW_NOTE -> stringResource(R.string.new_note)
+                            ToolbarTitle.EDIT_NOTE -> stringResource(R.string.edit_note)
+                            ToolbarTitle.NEW_CHECKLIST -> stringResource(R.string.new_checklist)
+                            ToolbarTitle.EDIT_CHECKLIST -> stringResource(R.string.edit_checklist)
+                        }
+                    )
+                },
+                navigationIcon = {
+                    IconButton(onClick = onNavigateBack) {
+                        Icon(
+                            imageVector = Icons.AutoMirrored.Filled.ArrowBack,
+                            contentDescription = stringResource(R.string.back)
+                        )
+                    }
+                },
+                actions = {
+                    // Delete button (only for existing notes)
+                    if (viewModel.canDelete()) {
+                        IconButton(onClick = { showDeleteDialog = true }) {
+                            Icon(
+                                imageVector = Icons.Default.Delete,
+                                contentDescription = stringResource(R.string.delete)
+                            )
+                        }
+                    }
+                    
+                    // Save button
+                    IconButton(onClick = { viewModel.saveNote() }) {
+                        Icon(
+                            imageVector = Icons.Default.Save,
+                            contentDescription = stringResource(R.string.save)
+                        )
+                    }
+                },
+                colors = TopAppBarDefaults.topAppBarColors(
+                    containerColor = MaterialTheme.colorScheme.surface
+                )
+            )
+        },
+        modifier = Modifier.imePadding()
+    ) { paddingValues ->
+        Column(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(paddingValues)
+                .padding(16.dp)
+        ) {
+            // Title Input (for both types)
+            OutlinedTextField(
+                value = uiState.title,
+                onValueChange = { viewModel.updateTitle(it) },
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .focusRequester(titleFocusRequester),
+                label = { Text(stringResource(R.string.title)) },
+                singleLine = false,
+                maxLines = 2,
+                shape = RoundedCornerShape(16.dp)
+            )
+            
+            Spacer(modifier = Modifier.height(16.dp))
+            
+            when (uiState.noteType) {
+                NoteType.TEXT -> {
+                    // Content Input for TEXT notes
+                    TextNoteContent(
+                        content = uiState.content,
+                        onContentChange = { viewModel.updateContent(it) },
+                        focusRequester = contentFocusRequester,
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .weight(1f)
+                    )
+                }
+                
+                NoteType.CHECKLIST -> {
+                    // Checklist Editor
+                    ChecklistEditor(
+                        items = checklistItems,
+                        scope = scope,
+                        focusNewItemId = focusNewItemId,
+                        onTextChange = { id, text -> viewModel.updateChecklistItemText(id, text) },
+                        onCheckedChange = { id, checked -> viewModel.updateChecklistItemChecked(id, checked) },
+                        onDelete = { id -> viewModel.deleteChecklistItem(id) },
+                        onAddNewItemAfter = { id -> 
+                            val newId = viewModel.addChecklistItemAfter(id)
+                            focusNewItemId = newId
+                        },
+                        onAddItemAtEnd = {
+                            val newId = viewModel.addChecklistItemAtEnd()
+                            focusNewItemId = newId
+                        },
+                        onMove = { from, to -> viewModel.moveChecklistItem(from, to) },
+                        onFocusHandled = { focusNewItemId = null },
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .weight(1f)
+                    )
+                }
+            }
+        }
+    }
+    
+    // Delete Confirmation Dialog - v1.5.0: Use shared component with server/local options
+    if (showDeleteDialog) {
+        DeleteConfirmationDialog(
+            noteCount = 1,
+            isOfflineMode = isOfflineMode,
+            onDismiss = { showDeleteDialog = false },
+            onDeleteLocal = {
+                showDeleteDialog = false
+                viewModel.deleteNote(deleteOnServer = false)
+            },
+            onDeleteEverywhere = {
+                showDeleteDialog = false
+                viewModel.deleteNote(deleteOnServer = true)
+            }
+        )
+    }
+}
+
+@Composable
+private fun TextNoteContent(
+    content: String,
+    onContentChange: (String) -> Unit,
+    focusRequester: FocusRequester,
+    modifier: Modifier = Modifier
+) {
+    // v1.5.0: Use TextFieldValue to control cursor position
+    // Track if initial cursor position has been set (only set to end once on first load)
+    var initialCursorSet by remember { mutableStateOf(false) }
+    
+    var textFieldValue by remember {
+        mutableStateOf(TextFieldValue(
+            text = content,
+            selection = TextRange(content.length)
+        ))
+    }
+    
+    // Set initial cursor position only once when content first loads
+    LaunchedEffect(Unit) {
+        if (!initialCursorSet && content.isNotEmpty()) {
+            textFieldValue = TextFieldValue(
+                text = content,
+                selection = TextRange(content.length)
+            )
+            initialCursorSet = true
+        }
+    }
+    
+    OutlinedTextField(
+        value = textFieldValue,
+        onValueChange = { newValue ->
+            textFieldValue = newValue
+            onContentChange(newValue.text)
+        },
+        modifier = modifier.focusRequester(focusRequester),
+        label = { Text(stringResource(R.string.content)) },
+        shape = RoundedCornerShape(16.dp)
+    )
+}
+
+@Suppress("LongParameterList") // Compose functions commonly have many callback parameters
+@Composable
+private fun ChecklistEditor(
+    items: List<ChecklistItemState>,
+    scope: kotlinx.coroutines.CoroutineScope,
+    focusNewItemId: String?,
+    onTextChange: (String, String) -> Unit,
+    onCheckedChange: (String, Boolean) -> Unit,
+    onDelete: (String) -> Unit,
+    onAddNewItemAfter: (String) -> Unit,
+    onAddItemAtEnd: () -> Unit,
+    onMove: (Int, Int) -> Unit,
+    onFocusHandled: () -> Unit,
+    modifier: Modifier = Modifier
+) {
+    val listState = rememberLazyListState()
+    val dragDropState = rememberDragDropListState(
+        lazyListState = listState,
+        scope = scope,
+        onMove = onMove
+    )
+    
+    Column(modifier = modifier) {
+        LazyColumn(
+            state = listState,
+            modifier = Modifier.weight(1f),
+            contentPadding = PaddingValues(vertical = 8.dp),
+            verticalArrangement = Arrangement.spacedBy(2.dp)
+        ) {
+            itemsIndexed(
+                items = items,
+                key = { _, item -> item.id }
+            ) { index, item ->
+                val isDragging = dragDropState.draggingItemIndex == index
+                val elevation by animateDpAsState(
+                    targetValue = if (isDragging) 8.dp else 0.dp,
+                    label = "elevation"
+                )
+                
+                val shouldFocus = item.id == focusNewItemId
+                
+                // v1.5.0: Clear focus request after handling
+                LaunchedEffect(shouldFocus) {
+                    if (shouldFocus) {
+                        onFocusHandled()
+                    }
+                }
+                
+                ChecklistItemRow(
+                    item = item,
+                    onTextChange = { onTextChange(item.id, it) },
+                    onCheckedChange = { onCheckedChange(item.id, it) },
+                    onDelete = { onDelete(item.id) },
+                    onAddNewItem = { onAddNewItemAfter(item.id) },
+                    requestFocus = shouldFocus,
+                    modifier = Modifier
+                        .dragContainer(dragDropState, index)
+                        .offset {
+                            IntOffset(
+                                0,
+                                if (isDragging) dragDropState.draggingItemOffset.roundToInt() else 0
+                            )
+                        }
+                        .shadow(elevation, shape = RoundedCornerShape(8.dp))
+                        .background(
+                            color = MaterialTheme.colorScheme.surface,
+                            shape = RoundedCornerShape(8.dp)
+                        )
+                )
+            }
+        }
+        
+        // Add Item Button
+        TextButton(
+            onClick = onAddItemAtEnd,
+            modifier = Modifier.padding(start = 8.dp)
+        ) {
+            Icon(
+                imageVector = Icons.Default.Add,
+                contentDescription = null,
+                modifier = Modifier.padding(end = 8.dp)
+            )
+            Text(stringResource(R.string.add_item))
+        }
+    }
+}
+
+// v1.5.0: Local DeleteConfirmationDialog removed - now using shared component from ui/main/components/

android/app/src/main/java/dev/dettmer/simplenotes/ui/editor/NoteEditorViewModel.kt

@@ -0,0 +1,451 @@
+package dev.dettmer.simplenotes.ui.editor
+
+import android.app.Application
+import android.content.Context
+import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.SavedStateHandle
+import androidx.lifecycle.viewModelScope
+import androidx.work.OneTimeWorkRequestBuilder
+import androidx.work.WorkManager
+import dev.dettmer.simplenotes.models.ChecklistItem
+import dev.dettmer.simplenotes.models.Note
+import dev.dettmer.simplenotes.models.NoteType
+import dev.dettmer.simplenotes.models.SyncStatus
+import dev.dettmer.simplenotes.storage.NotesStorage
+import dev.dettmer.simplenotes.sync.SyncWorker
+import dev.dettmer.simplenotes.sync.WebDavSyncService
+import dev.dettmer.simplenotes.utils.Constants
+import dev.dettmer.simplenotes.utils.DeviceIdGenerator
+import dev.dettmer.simplenotes.utils.Logger
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.SharedFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asSharedFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import java.util.UUID
+
+/**
+ * ViewModel for NoteEditor Compose Screen
+ * v1.5.0: Jetpack Compose NoteEditor Redesign
+ * 
+ * Manages note editing state including title, content, and checklist items.
+ */
+class NoteEditorViewModel(
+    application: Application,
+    private val savedStateHandle: SavedStateHandle
+) : AndroidViewModel(application) {
+    
+    companion object {
+        private const val TAG = "NoteEditorViewModel"
+        const val ARG_NOTE_ID = "noteId"
+        const val ARG_NOTE_TYPE = "noteType"
+    }
+    
+    private val storage = NotesStorage(application)
+    private val prefs = application.getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // State
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    private val _uiState = MutableStateFlow(NoteEditorUiState())
+    val uiState: StateFlow<NoteEditorUiState> = _uiState.asStateFlow()
+    
+    private val _checklistItems = MutableStateFlow<List<ChecklistItemState>>(emptyList())
+    val checklistItems: StateFlow<List<ChecklistItemState>> = _checklistItems.asStateFlow()
+    
+    // 🌟 v1.6.0: Offline Mode State
+    private val _isOfflineMode = MutableStateFlow(
+        prefs.getBoolean(Constants.KEY_OFFLINE_MODE, true)
+    )
+    val isOfflineMode: StateFlow<Boolean> = _isOfflineMode.asStateFlow()
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Events
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    private val _events = MutableSharedFlow<NoteEditorEvent>()
+    val events: SharedFlow<NoteEditorEvent> = _events.asSharedFlow()
+    
+    // Internal state
+    private var existingNote: Note? = null
+    private var currentNoteType: NoteType = NoteType.TEXT
+    
+    init {
+        loadNote()
+    }
+    
+    private fun loadNote() {
+        val noteId = savedStateHandle.get<String>(ARG_NOTE_ID)
+        val noteTypeString = savedStateHandle.get<String>(ARG_NOTE_TYPE) ?: NoteType.TEXT.name
+        
+        if (noteId != null) {
+            // Load existing note
+            existingNote = storage.loadNote(noteId)
+            existingNote?.let { note ->
+                currentNoteType = note.noteType
+                _uiState.update { state ->
+                    state.copy(
+                        title = note.title,
+                        content = note.content,
+                        noteType = note.noteType,
+                        isNewNote = false,
+                        toolbarTitle = if (note.noteType == NoteType.CHECKLIST) {
+                            ToolbarTitle.EDIT_CHECKLIST
+                        } else {
+                            ToolbarTitle.EDIT_NOTE
+                        }
+                    )
+                }
+                
+                if (note.noteType == NoteType.CHECKLIST) {
+                    val items = note.checklistItems?.sortedBy { it.order }?.map { 
+                        ChecklistItemState(
+                            id = it.id,
+                            text = it.text,
+                            isChecked = it.isChecked,
+                            order = it.order
+                        )
+                    } ?: emptyList()
+                    _checklistItems.value = items
+                }
+            }
+        } else {
+            // New note
+            currentNoteType = try {
+                NoteType.valueOf(noteTypeString)
+            } catch (e: IllegalArgumentException) {
+                Logger.w(TAG, "Invalid note type '$noteTypeString', defaulting to TEXT: ${e.message}")
+                NoteType.TEXT
+            }
+            
+            _uiState.update { state ->
+                state.copy(
+                    noteType = currentNoteType,
+                    isNewNote = true,
+                    toolbarTitle = if (currentNoteType == NoteType.CHECKLIST) {
+                        ToolbarTitle.NEW_CHECKLIST
+                    } else {
+                        ToolbarTitle.NEW_NOTE
+                    }
+                )
+            }
+            
+            // Add first empty item for new checklists
+            if (currentNoteType == NoteType.CHECKLIST) {
+                _checklistItems.value = listOf(ChecklistItemState.createEmpty(0))
+            }
+        }
+    }
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Actions
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    fun updateTitle(title: String) {
+        _uiState.update { it.copy(title = title) }
+    }
+    
+    fun updateContent(content: String) {
+        _uiState.update { it.copy(content = content) }
+    }
+    
+    fun updateChecklistItemText(itemId: String, newText: String) {
+        _checklistItems.update { items ->
+            items.map { item ->
+                if (item.id == itemId) item.copy(text = newText) else item
+            }
+        }
+    }
+    
+    fun updateChecklistItemChecked(itemId: String, isChecked: Boolean) {
+        _checklistItems.update { items ->
+            items.map { item ->
+                if (item.id == itemId) item.copy(isChecked = isChecked) else item
+            }
+        }
+    }
+    
+    fun addChecklistItemAfter(afterItemId: String): String {
+        val newItem = ChecklistItemState.createEmpty(0)
+        _checklistItems.update { items ->
+            val index = items.indexOfFirst { it.id == afterItemId }
+            if (index >= 0) {
+                val newList = items.toMutableList()
+                newList.add(index + 1, newItem)
+                // Update order values
+                newList.mapIndexed { i, item -> item.copy(order = i) }
+            } else {
+                items + newItem.copy(order = items.size)
+            }
+        }
+        return newItem.id
+    }
+    
+    fun addChecklistItemAtEnd(): String {
+        val newItem = ChecklistItemState.createEmpty(_checklistItems.value.size)
+        _checklistItems.update { items -> items + newItem }
+        return newItem.id
+    }
+    
+    fun deleteChecklistItem(itemId: String) {
+        _checklistItems.update { items ->
+            val filtered = items.filter { it.id != itemId }
+            // Ensure at least one item exists
+            if (filtered.isEmpty()) {
+                listOf(ChecklistItemState.createEmpty(0))
+            } else {
+                // Update order values
+                filtered.mapIndexed { index, item -> item.copy(order = index) }
+            }
+        }
+    }
+    
+    fun moveChecklistItem(fromIndex: Int, toIndex: Int) {
+        _checklistItems.update { items ->
+            val mutableList = items.toMutableList()
+            val item = mutableList.removeAt(fromIndex)
+            mutableList.add(toIndex, item)
+            // Update order values
+            mutableList.mapIndexed { index, i -> i.copy(order = index) }
+        }
+    }
+    
+    fun saveNote() {
+        viewModelScope.launch {
+            val state = _uiState.value
+            val title = state.title.trim()
+            
+            when (currentNoteType) {
+                NoteType.TEXT -> {
+                    val content = state.content.trim()
+                    
+                    if (title.isEmpty() && content.isEmpty()) {
+                        _events.emit(NoteEditorEvent.ShowToast(ToastMessage.NOTE_IS_EMPTY))
+                        return@launch
+                    }
+                    
+                    val note = if (existingNote != null) {
+                        existingNote!!.copy(
+                            title = title,
+                            content = content,
+                            noteType = NoteType.TEXT,
+                            checklistItems = null,
+                            updatedAt = System.currentTimeMillis(),
+                            syncStatus = SyncStatus.PENDING
+                        )
+                    } else {
+                        Note(
+                            title = title,
+                            content = content,
+                            noteType = NoteType.TEXT,
+                            checklistItems = null,
+                            deviceId = DeviceIdGenerator.getDeviceId(getApplication()),
+                            syncStatus = SyncStatus.LOCAL_ONLY
+                        )
+                    }
+                    
+                    storage.saveNote(note)
+                }
+                
+                NoteType.CHECKLIST -> {
+                    // Filter empty items
+                    val validItems = _checklistItems.value
+                        .filter { it.text.isNotBlank() }
+                        .mapIndexed { index, item ->
+                            ChecklistItem(
+                                id = item.id,
+                                text = item.text,
+                                isChecked = item.isChecked,
+                                order = index
+                            )
+                        }
+                    
+                    if (title.isEmpty() && validItems.isEmpty()) {
+                        _events.emit(NoteEditorEvent.ShowToast(ToastMessage.NOTE_IS_EMPTY))
+                        return@launch
+                    }
+                    
+                    val note = if (existingNote != null) {
+                        existingNote!!.copy(
+                            title = title,
+                            content = "", // Empty for checklists
+                            noteType = NoteType.CHECKLIST,
+                            checklistItems = validItems,
+                            updatedAt = System.currentTimeMillis(),
+                            syncStatus = SyncStatus.PENDING
+                        )
+                    } else {
+                        Note(
+                            title = title,
+                            content = "",
+                            noteType = NoteType.CHECKLIST,
+                            checklistItems = validItems,
+                            deviceId = DeviceIdGenerator.getDeviceId(getApplication()),
+                            syncStatus = SyncStatus.LOCAL_ONLY
+                        )
+                    }
+                    
+                    storage.saveNote(note)
+                }
+            }
+            
+            _events.emit(NoteEditorEvent.ShowToast(ToastMessage.NOTE_SAVED))
+            
+            // 🌟 v1.6.0: Trigger onSave Sync
+            triggerOnSaveSync()
+            
+            _events.emit(NoteEditorEvent.NavigateBack)
+        }
+    }
+    
+    /**
+     * Delete the current note
+     * @param deleteOnServer if true, also triggers server deletion; if false, only deletes locally
+     * v1.5.0: Added deleteOnServer parameter for unified delete dialog
+     */
+    fun deleteNote(deleteOnServer: Boolean = true) {
+        viewModelScope.launch {
+            existingNote?.let { note ->
+                val noteId = note.id
+                
+                // Delete locally first
+                storage.deleteNote(noteId)
+                
+                // Delete from server if requested
+                if (deleteOnServer) {
+                    try {
+                        val webdavService = WebDavSyncService(getApplication())
+                        val success = withContext(Dispatchers.IO) {
+                            webdavService.deleteNoteFromServer(noteId)
+                        }
+                        if (success) {
+                            Logger.d(TAG, "Note $noteId deleted from server")
+                        } else {
+                            Logger.w(TAG, "Failed to delete note $noteId from server")
+                        }
+                    } catch (e: Exception) {
+                        Logger.e(TAG, "Error deleting note from server: ${e.message}")
+                    }
+                }
+                
+                _events.emit(NoteEditorEvent.ShowToast(ToastMessage.NOTE_DELETED))
+                _events.emit(NoteEditorEvent.NavigateBack)
+            }
+        }
+    }
+    
+    fun showDeleteConfirmation() {
+        viewModelScope.launch {
+            _events.emit(NoteEditorEvent.ShowDeleteConfirmation)
+        }
+    }
+    
+    fun canDelete(): Boolean = existingNote != null
+    
+    // ═══════════════════════════════════════════════════════════════════════════
+    // 🌟 v1.6.0: Sync Trigger - onSave
+    // ═══════════════════════════════════════════════════════════════════════════
+    
+    /**
+     * Triggers sync after saving a note (if enabled and server configured)
+     * v1.6.0: New configurable sync trigger
+     * v1.7.0: Uses central canSync() gate for WiFi-only check
+     * 
+     * Separate throttling (5 seconds) to prevent spam when saving multiple times
+     */
+    private fun triggerOnSaveSync() {
+        // Check 1: Trigger enabled?
+        if (!prefs.getBoolean(Constants.KEY_SYNC_TRIGGER_ON_SAVE, Constants.DEFAULT_TRIGGER_ON_SAVE)) {
+            Logger.d(TAG, "⏭️ onSave sync disabled - skipping")
+            return
+        }
+        
+        // 🆕 v1.7.0: Zentrale Sync-Gate Prüfung (inkl. WiFi-Only, Offline Mode, Server Config)
+        val syncService = WebDavSyncService(getApplication())
+        val gateResult = syncService.canSync()
+        if (!gateResult.canSync) {
+            if (gateResult.isBlockedByWifiOnly) {
+                Logger.d(TAG, "⏭️ onSave sync blocked: WiFi-only mode, not on WiFi")
+            } else {
+                Logger.d(TAG, "⏭️ onSave sync blocked: ${gateResult.blockReason ?: "offline/no server"}")
+            }
+            return
+        }
+        
+        // Check 2: Throttling (5 seconds) to prevent spam
+        val lastOnSaveSyncTime = prefs.getLong(Constants.PREF_LAST_ON_SAVE_SYNC_TIME, 0)
+        val now = System.currentTimeMillis()
+        val timeSinceLastSync = now - lastOnSaveSyncTime
+        
+        if (timeSinceLastSync < Constants.MIN_ON_SAVE_SYNC_INTERVAL_MS) {
+            val remainingSeconds = (Constants.MIN_ON_SAVE_SYNC_INTERVAL_MS - timeSinceLastSync) / 1000
+            Logger.d(TAG, "⏳ onSave sync throttled - wait ${remainingSeconds}s")
+            return
+        }
+        
+        // Update last sync time
+        prefs.edit().putLong(Constants.PREF_LAST_ON_SAVE_SYNC_TIME, now).apply()
+        
+        // Trigger sync via WorkManager
+        Logger.d(TAG, "📤 Triggering onSave sync")
+        val syncRequest = OneTimeWorkRequestBuilder<SyncWorker>()
+            .addTag(Constants.SYNC_WORK_TAG)
+            .build()
+        WorkManager.getInstance(getApplication()).enqueue(syncRequest)
+    }
+}
+
+// ═══════════════════════════════════════════════════════════════════════════
+// State Classes
+// ═══════════════════════════════════════════════════════════════════════════
+
+data class NoteEditorUiState(
+    val title: String = "",
+    val content: String = "",
+    val noteType: NoteType = NoteType.TEXT,
+    val isNewNote: Boolean = true,
+    val toolbarTitle: ToolbarTitle = ToolbarTitle.NEW_NOTE
+)
+
+data class ChecklistItemState(
+    val id: String = UUID.randomUUID().toString(),
+    val text: String = "",
+    val isChecked: Boolean = false,
+    val order: Int = 0
+) {
+    companion object {
+        fun createEmpty(order: Int): ChecklistItemState {
+            return ChecklistItemState(
+                id = UUID.randomUUID().toString(),
+                text = "",
+                isChecked = false,
+                order = order
+            )
+        }
+    }
+}
+
+enum class ToolbarTitle {
+    NEW_NOTE,
+    EDIT_NOTE,
+    NEW_CHECKLIST,
+    EDIT_CHECKLIST
+}
+
+enum class ToastMessage {
+    NOTE_IS_EMPTY,
+    NOTE_SAVED,
+    NOTE_DELETED
+}
+
+sealed interface NoteEditorEvent {
+    data class ShowToast(val message: ToastMessage) : NoteEditorEvent
+    data object NavigateBack : NoteEditorEvent
+    data object ShowDeleteConfirmation : NoteEditorEvent
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/editor/components/ChecklistItemRow.kt

@@ -0,0 +1,179 @@
+package dev.dettmer.simplenotes.ui.editor.components
+
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.text.BasicTextField
+import androidx.compose.foundation.text.KeyboardActions
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Close
+import androidx.compose.material.icons.filled.DragHandle
+import androidx.compose.material3.Checkbox
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.LocalTextStyle
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.alpha
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
+import androidx.compose.ui.graphics.SolidColor
+import androidx.compose.ui.platform.LocalSoftwareKeyboardController
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.TextRange
+import androidx.compose.ui.text.input.ImeAction
+import androidx.compose.ui.text.input.TextFieldValue
+import androidx.compose.ui.text.style.TextDecoration
+import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.ui.editor.ChecklistItemState
+
+/**
+ * A single row in the checklist editor with drag handle, checkbox, text input, and delete button.
+ * 
+ * v1.5.0: Jetpack Compose NoteEditor Redesign
+ */
+@Composable
+fun ChecklistItemRow(
+    item: ChecklistItemState,
+    onTextChange: (String) -> Unit,
+    onCheckedChange: (Boolean) -> Unit,
+    onDelete: () -> Unit,
+    onAddNewItem: () -> Unit,
+    requestFocus: Boolean = false,
+    modifier: Modifier = Modifier
+) {
+    val focusRequester = remember { FocusRequester() }
+    val keyboardController = LocalSoftwareKeyboardController.current
+    var textFieldValue by remember(item.id) {
+        mutableStateOf(TextFieldValue(text = item.text, selection = TextRange(item.text.length)))
+    }
+    
+    // v1.5.0: Auto-focus AND show keyboard when requestFocus is true (new items)
+    LaunchedEffect(requestFocus) {
+        if (requestFocus) {
+            focusRequester.requestFocus()
+            keyboardController?.show()
+        }
+    }
+    
+    // Update text field when external state changes
+    LaunchedEffect(item.text) {
+        if (textFieldValue.text != item.text) {
+            textFieldValue = TextFieldValue(
+                text = item.text,
+                selection = TextRange(item.text.length)
+            )
+        }
+    }
+    
+    val alpha = if (item.isChecked) 0.6f else 1.0f
+    val textDecoration = if (item.isChecked) TextDecoration.LineThrough else TextDecoration.None
+    
+    @Suppress("MagicNumber") // UI padding values are self-explanatory
+    Row(
+        modifier = modifier
+            .fillMaxWidth()
+            .padding(horizontal = 8.dp, vertical = 4.dp),
+        verticalAlignment = Alignment.CenterVertically
+    ) {
+        // Drag Handle
+        Icon(
+            imageVector = Icons.Default.DragHandle,
+            contentDescription = stringResource(R.string.drag_to_reorder),
+            modifier = Modifier
+                .size(24.dp)
+                .alpha(0.5f),
+            tint = MaterialTheme.colorScheme.onSurfaceVariant
+        )
+        
+        Spacer(modifier = Modifier.width(4.dp))
+        
+        // Checkbox
+        Checkbox(
+            checked = item.isChecked,
+            onCheckedChange = onCheckedChange,
+            modifier = Modifier.alpha(alpha)
+        )
+        
+        Spacer(modifier = Modifier.width(4.dp))
+        
+        // Text Input with placeholder
+        BasicTextField(
+            value = textFieldValue,
+            onValueChange = { newValue ->
+                // Check for newline (Enter key)
+                if (newValue.text.contains("\n")) {
+                    val cleanText = newValue.text.replace("\n", "")
+                    textFieldValue = TextFieldValue(
+                        text = cleanText,
+                        selection = TextRange(cleanText.length)
+                    )
+                    onTextChange(cleanText)
+                    onAddNewItem()
+                } else {
+                    textFieldValue = newValue
+                    onTextChange(newValue.text)
+                }
+            },
+            modifier = Modifier
+                .weight(1f)
+                .focusRequester(focusRequester)
+                .alpha(alpha),
+            textStyle = LocalTextStyle.current.copy(
+                color = MaterialTheme.colorScheme.onSurface,
+                textDecoration = textDecoration
+            ),
+            keyboardOptions = KeyboardOptions(
+                imeAction = ImeAction.Next
+            ),
+            keyboardActions = KeyboardActions(
+                onNext = { onAddNewItem() }
+            ),
+            singleLine = false,
+            maxLines = 5,
+            cursorBrush = SolidColor(MaterialTheme.colorScheme.primary),
+            decorationBox = { innerTextField ->
+                Box {
+                    if (textFieldValue.text.isEmpty()) {
+                        Text(
+                            text = stringResource(R.string.item_placeholder),
+                            style = LocalTextStyle.current.copy(
+                                color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f)
+                            )
+                        )
+                    }
+                    innerTextField()
+                }
+            }
+        )
+        
+        Spacer(modifier = Modifier.width(4.dp))
+        
+        // Delete Button
+        IconButton(
+            onClick = onDelete,
+            modifier = Modifier.size(36.dp)
+        ) {
+            Icon(
+                imageVector = Icons.Default.Close,
+                contentDescription = stringResource(R.string.delete_item),
+                tint = MaterialTheme.colorScheme.onSurfaceVariant,
+                modifier = Modifier.size(20.dp)
+            )
+        }
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/ComposeMainActivity.kt

@@ -0,0 +1,400 @@
+@file:Suppress("DEPRECATION") // LocalBroadcastManager & deprecated lifecycle methods, will migrate in v2.0.0
+
+package dev.dettmer.simplenotes.ui.main
+
+import android.Manifest
+import android.app.ActivityOptions
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.content.IntentFilter
+import android.content.pm.PackageManager
+import android.os.Build
+import android.os.Bundle
+import android.widget.Toast
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.activity.enableEdgeToEdge
+import androidx.activity.viewModels
+import androidx.compose.material3.AlertDialog
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import androidx.core.splashscreen.SplashScreen.Companion.installSplashScreen
+import androidx.lifecycle.lifecycleScope
+import androidx.localbroadcastmanager.content.LocalBroadcastManager
+import com.google.android.material.color.DynamicColors
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.ui.editor.ComposeNoteEditorActivity
+import dev.dettmer.simplenotes.models.NoteType
+import dev.dettmer.simplenotes.models.SyncStatus
+import dev.dettmer.simplenotes.storage.NotesStorage
+import dev.dettmer.simplenotes.sync.SyncStateManager
+import dev.dettmer.simplenotes.sync.SyncWorker
+import dev.dettmer.simplenotes.ui.settings.ComposeSettingsActivity
+import dev.dettmer.simplenotes.ui.theme.SimpleNotesTheme
+import dev.dettmer.simplenotes.utils.Constants
+import dev.dettmer.simplenotes.utils.Logger
+import dev.dettmer.simplenotes.utils.NotificationHelper
+import kotlinx.coroutines.launch
+
+/**
+ * Main Activity with Jetpack Compose UI
+ * v1.5.0: Complete MainActivity Redesign with Compose
+ * 
+ * Replaces the old 805-line MainActivity.kt with a modern
+ * Compose-based implementation featuring:
+ * - Notes list with swipe-to-delete
+ * - Pull-to-refresh for sync
+ * - FAB with note type selection
+ * - Material 3 Design with Dynamic Colors (Material You)
+ * - Design consistent with ComposeSettingsActivity
+ */
+class ComposeMainActivity : ComponentActivity() {
+    
+    companion object {
+        private const val TAG = "ComposeMainActivity"
+        private const val REQUEST_NOTIFICATION_PERMISSION = 1001
+        private const val REQUEST_SETTINGS = 1002
+    }
+    
+    private val viewModel: MainViewModel by viewModels()
+    
+    private val prefs by lazy {
+        getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)
+    }
+    
+    // Phase 3: Track if coming from editor to scroll to top
+    private var cameFromEditor = false
+    
+    /**
+     * BroadcastReceiver for Background-Sync Completion (Periodic Sync)
+     */
+    private val syncCompletedReceiver = object : BroadcastReceiver() {
+        override fun onReceive(context: Context?, intent: Intent?) {
+            val success = intent?.getBooleanExtra("success", false) ?: false
+            val count = intent?.getIntExtra("count", 0) ?: 0
+            
+            Logger.d(TAG, "📡 Sync completed broadcast received: success=$success, count=$count")
+            
+            // UI refresh
+            if (success && count > 0) {
+                viewModel.loadNotes()
+                Logger.d(TAG, "🔄 Notes reloaded after background sync")
+            }
+        }
+    }
+    
+    override fun onCreate(savedInstanceState: Bundle?) {
+        // Install Splash Screen (Android 12+)
+        installSplashScreen()
+        
+        super.onCreate(savedInstanceState)
+        
+        // Apply Dynamic Colors for Material You (Android 12+)
+        DynamicColors.applyToActivityIfAvailable(this)
+        
+        // Enable edge-to-edge display
+        enableEdgeToEdge()
+        
+        // Initialize Logger and enable file logging if configured
+        Logger.init(this)
+        if (prefs.getBoolean(Constants.KEY_FILE_LOGGING_ENABLED, false)) {
+            Logger.setFileLoggingEnabled(true)
+        }
+        
+        // Clear old sync notifications on app start
+        NotificationHelper.clearSyncNotifications(this)
+        
+        // Request notification permission (Android 13+)
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            requestNotificationPermission()
+        }
+        
+        // v1.4.1: Migrate checklists for backwards compatibility
+        migrateChecklistsForBackwardsCompat()
+        
+        // Setup Sync State Observer
+        setupSyncStateObserver()
+        
+        setContent {
+            SimpleNotesTheme {
+                val context = LocalContext.current
+                
+                // Dialog state for delete confirmation
+                var deleteDialogData by remember { mutableStateOf<MainViewModel.DeleteDialogData?>(null) }
+                
+                // Handle delete dialog events
+                LaunchedEffect(Unit) {
+                    viewModel.showDeleteDialog.collect { data ->
+                        deleteDialogData = data
+                    }
+                }
+                
+                // Handle toast events
+                LaunchedEffect(Unit) {
+                    viewModel.showToast.collect { message ->
+                        Toast.makeText(context, message, Toast.LENGTH_SHORT).show()
+                    }
+                }
+                
+                // Delete confirmation dialog
+                deleteDialogData?.let { data ->
+                    DeleteConfirmationDialog(
+                        noteTitle = data.note.title,
+                        onDismiss = {
+                            viewModel.restoreNoteAfterSwipe(data.originalList)
+                            deleteDialogData = null
+                        },
+                        onDeleteLocal = {
+                            viewModel.deleteNoteConfirmed(data.note, deleteFromServer = false)
+                            deleteDialogData = null
+                        },
+                        onDeleteFromServer = {
+                            viewModel.deleteNoteConfirmed(data.note, deleteFromServer = true)
+                            deleteDialogData = null
+                        }
+                    )
+                }
+                
+                MainScreen(
+                    viewModel = viewModel,
+                    onOpenNote = { noteId -> openNoteEditor(noteId) },
+                    onOpenSettings = { openSettings() },
+                    onCreateNote = { noteType -> createNote(noteType) }
+                )
+            }
+        }
+    }
+    
+    override fun onResume() {
+        super.onResume()
+        
+        Logger.d(TAG, "📱 ComposeMainActivity.onResume() - Registering receivers")
+        
+        // 🌟 v1.6.0: Refresh offline mode state FIRST (before any sync checks)
+        // This ensures UI reflects current offline mode when returning from Settings
+        viewModel.refreshOfflineModeState()
+        
+        // 🎨 v1.7.0: Refresh display mode when returning from Settings
+        viewModel.refreshDisplayMode()
+        
+        // Register BroadcastReceiver for Background-Sync
+        @Suppress("DEPRECATION") // LocalBroadcastManager deprecated but functional
+        LocalBroadcastManager.getInstance(this).registerReceiver(
+            syncCompletedReceiver,
+            IntentFilter(SyncWorker.ACTION_SYNC_COMPLETED)
+        )
+        
+        Logger.d(TAG, "📡 BroadcastReceiver registered (sync-completed)")
+        
+        // Reload notes
+        viewModel.loadNotes()
+        
+        // Phase 3: Scroll to top if coming from editor (new/edited note)
+        if (cameFromEditor) {
+            viewModel.scrollToTop()
+            cameFromEditor = false
+            Logger.d(TAG, "📜 Came from editor - scrolling to top")
+        }
+        
+        // Trigger Auto-Sync on app resume
+        viewModel.triggerAutoSync("onResume")
+    }
+    
+    override fun onPause() {
+        super.onPause()
+        
+        // Unregister BroadcastReceiver
+        @Suppress("DEPRECATION")
+        LocalBroadcastManager.getInstance(this).unregisterReceiver(syncCompletedReceiver)
+        Logger.d(TAG, "📡 BroadcastReceiver unregistered")
+    }
+    
+    private fun setupSyncStateObserver() {
+        SyncStateManager.syncStatus.observe(this) { status ->
+            viewModel.updateSyncState(status)
+            
+            @Suppress("MagicNumber") // UI timing delays for banner visibility
+            // Hide banner after delay for completed/error states
+            when (status.state) {
+                SyncStateManager.SyncState.COMPLETED -> {
+                    lifecycleScope.launch {
+                        kotlinx.coroutines.delay(1500L)
+                        SyncStateManager.reset()
+                    }
+                }
+                SyncStateManager.SyncState.ERROR -> {
+                    lifecycleScope.launch {
+                        kotlinx.coroutines.delay(3000L)
+                        SyncStateManager.reset()
+                    }
+                }
+                else -> { /* No action needed */ }
+            }
+        }
+    }
+    
+    private fun openNoteEditor(noteId: String?) {
+        cameFromEditor = true
+        val intent = Intent(this, ComposeNoteEditorActivity::class.java)
+        noteId?.let {
+            intent.putExtra(ComposeNoteEditorActivity.EXTRA_NOTE_ID, it)
+        }
+        
+        // v1.5.0: Add slide animation
+        val options = ActivityOptions.makeCustomAnimation(
+            this,
+            dev.dettmer.simplenotes.R.anim.slide_in_right,
+            dev.dettmer.simplenotes.R.anim.slide_out_left
+        )
+        startActivity(intent, options.toBundle())
+    }
+    
+    private fun createNote(noteType: NoteType) {
+        cameFromEditor = true
+        val intent = Intent(this, ComposeNoteEditorActivity::class.java)
+        intent.putExtra(ComposeNoteEditorActivity.EXTRA_NOTE_TYPE, noteType.name)
+        
+        // v1.5.0: Add slide animation
+        val options = ActivityOptions.makeCustomAnimation(
+            this,
+            dev.dettmer.simplenotes.R.anim.slide_in_right,
+            dev.dettmer.simplenotes.R.anim.slide_out_left
+        )
+        startActivity(intent, options.toBundle())
+    }
+    
+    private fun openSettings() {
+        val intent = Intent(this, ComposeSettingsActivity::class.java)
+        val options = ActivityOptions.makeCustomAnimation(
+            this,
+            dev.dettmer.simplenotes.R.anim.slide_in_right,
+            dev.dettmer.simplenotes.R.anim.slide_out_left
+        )
+        @Suppress("DEPRECATION")
+        startActivityForResult(intent, REQUEST_SETTINGS, options.toBundle())
+    }
+    
+    private fun requestNotificationPermission() {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            if (checkSelfPermission(Manifest.permission.POST_NOTIFICATIONS) 
+                != PackageManager.PERMISSION_GRANTED) {
+                requestPermissions(
+                    arrayOf(Manifest.permission.POST_NOTIFICATIONS),
+                    REQUEST_NOTIFICATION_PERMISSION
+                )
+            }
+        }
+    }
+    
+    /**
+     * v1.4.1: Migrates existing checklists for backwards compatibility.
+     */
+    private fun migrateChecklistsForBackwardsCompat() {
+        val migrationKey = "v1.4.1_checklist_migration_done"
+        
+        // Only run once
+        if (prefs.getBoolean(migrationKey, false)) {
+            return
+        }
+        
+        val storage = NotesStorage(this)
+        val allNotes = storage.loadAllNotes()
+        val checklistsToMigrate = allNotes.filter { note ->
+            note.noteType == NoteType.CHECKLIST && 
+            note.content.isBlank() &&
+            note.checklistItems?.isNotEmpty() == true
+        }
+        
+        if (checklistsToMigrate.isNotEmpty()) {
+            Logger.d(TAG, "🔄 v1.4.1 Migration: Found ${checklistsToMigrate.size} checklists without fallback content")
+            
+            for (note in checklistsToMigrate) {
+                val updatedNote = note.copy(
+                    syncStatus = SyncStatus.PENDING
+                )
+                storage.saveNote(updatedNote)
+                Logger.d(TAG, "   📝 Marked for re-sync: ${note.title}")
+            }
+            
+            Logger.d(TAG, "✅ v1.4.1 Migration: ${checklistsToMigrate.size} checklists marked for re-sync")
+        }
+        
+        // Mark migration as done
+        prefs.edit().putBoolean(migrationKey, true).apply()
+    }
+    
+    @Deprecated("Deprecated in Java")
+    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
+        super.onActivityResult(requestCode, resultCode, data)
+        
+        if (requestCode == REQUEST_SETTINGS && resultCode == RESULT_OK) {
+            // Settings changed, reload notes
+            viewModel.loadNotes()
+        }
+    }
+    
+    @Deprecated("Deprecated in API 23", ReplaceWith("Use ActivityResultContracts"))
+    @Suppress("DEPRECATION", "OVERRIDE_DEPRECATION")
+    override fun onRequestPermissionsResult(
+        requestCode: Int,
+        permissions: Array<out String>,
+        grantResults: IntArray
+    ) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
+        
+        when (requestCode) {
+            REQUEST_NOTIFICATION_PERMISSION -> {
+                if (grantResults.isNotEmpty() && 
+                    grantResults[0] == PackageManager.PERMISSION_GRANTED) {
+                    Toast.makeText(this, getString(R.string.toast_notifications_enabled), Toast.LENGTH_SHORT).show()
+                } else {
+                    Toast.makeText(this, 
+                        getString(R.string.toast_notifications_disabled), 
+                        Toast.LENGTH_SHORT
+                    ).show()
+                }
+            }
+        }
+    }
+}
+
+/**
+ * Delete confirmation dialog
+ */
+@Composable
+private fun DeleteConfirmationDialog(
+    noteTitle: String,
+    onDismiss: () -> Unit,
+    onDeleteLocal: () -> Unit,
+    onDeleteFromServer: () -> Unit
+) {
+    AlertDialog(
+        onDismissRequest = onDismiss,
+        title = { Text(stringResource(R.string.legacy_delete_dialog_title)) },
+        text = { 
+            Text(stringResource(R.string.legacy_delete_dialog_message, noteTitle)) 
+        },
+        dismissButton = {
+            TextButton(onClick = onDismiss) {
+                Text(stringResource(R.string.cancel))
+            }
+        },
+        confirmButton = {
+            TextButton(onClick = onDeleteLocal) {
+                Text(stringResource(R.string.delete_local_only))
+            }
+            TextButton(onClick = onDeleteFromServer) {
+                Text(stringResource(R.string.legacy_delete_from_server))
+            }
+        }
+    )
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/MainScreen.kt

@@ -0,0 +1,367 @@
+package dev.dettmer.simplenotes.ui.main
+
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.fadeIn
+import androidx.compose.animation.fadeOut
+import androidx.compose.animation.slideInVertically
+import androidx.compose.animation.slideOutVertically
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.lazy.rememberLazyListState
+import androidx.compose.foundation.lazy.staggeredgrid.rememberLazyStaggeredGridState
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Close
+import androidx.compose.material.icons.filled.Delete
+import androidx.compose.material.icons.filled.Refresh
+import androidx.compose.material.icons.filled.SelectAll
+import androidx.compose.material.icons.filled.Settings
+import androidx.compose.material3.ExperimentalMaterial3Api
+// FabPosition nicht mehr benötigt - FAB wird manuell platziert
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.SnackbarDuration
+import androidx.compose.material3.SnackbarHost
+import androidx.compose.material3.SnackbarHostState
+import androidx.compose.material3.SnackbarResult
+import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBar
+import androidx.compose.material3.TopAppBarDefaults
+import androidx.compose.material3.pulltorefresh.PullToRefreshBox
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.zIndex
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.models.NoteType
+import dev.dettmer.simplenotes.sync.SyncStateManager
+import dev.dettmer.simplenotes.ui.main.components.DeleteConfirmationDialog
+import dev.dettmer.simplenotes.ui.main.components.EmptyState
+import dev.dettmer.simplenotes.ui.main.components.NoteTypeFAB
+import dev.dettmer.simplenotes.ui.main.components.NotesList
+import dev.dettmer.simplenotes.ui.main.components.NotesStaggeredGrid
+import dev.dettmer.simplenotes.ui.main.components.SyncStatusBanner
+import kotlinx.coroutines.launch
+
+/**
+ * Main screen displaying the notes list
+ * v1.5.0: Jetpack Compose MainActivity Redesign
+ * 
+ * Performance optimized with proper state handling:
+ * - LazyListState for scroll control
+ * - Scaffold FAB slot for proper z-ordering
+ * - Scroll-to-top on new note
+ */
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun MainScreen(
+    viewModel: MainViewModel,
+    onOpenNote: (String?) -> Unit,
+    onOpenSettings: () -> Unit,
+    onCreateNote: (NoteType) -> Unit
+) {
+    val notes by viewModel.notes.collectAsState()
+    val syncState by viewModel.syncState.collectAsState()
+    val syncMessage by viewModel.syncMessage.collectAsState()
+    val scrollToTop by viewModel.scrollToTop.collectAsState()
+    
+    // Multi-Select State
+    val selectedNotes by viewModel.selectedNotes.collectAsState()
+    val isSelectionMode by viewModel.isSelectionMode.collectAsState()
+    
+    // 🌟 v1.6.0: Reactive offline mode state
+    val isOfflineMode by viewModel.isOfflineMode.collectAsState()
+    
+    // 🎨 v1.7.0: Display mode (list or grid)
+    val displayMode by viewModel.displayMode.collectAsState()
+    
+    // Delete confirmation dialog state
+    var showBatchDeleteDialog by remember { mutableStateOf(false) }
+    
+    val snackbarHostState = remember { SnackbarHostState() }
+    val scope = rememberCoroutineScope()
+    val listState = rememberLazyListState()
+    // 🎨 v1.7.0: gridState für Staggered Grid Layout
+    val gridState = rememberLazyStaggeredGridState()
+    
+    // Compute isSyncing once
+    val isSyncing = syncState == SyncStateManager.SyncState.SYNCING
+    
+    // 🌟 v1.6.0: Reactive sync availability (recomposes when offline mode changes)
+    // Note: isOfflineMode is updated via StateFlow from MainViewModel.refreshOfflineModeState()
+    // which is called in ComposeMainActivity.onResume() when returning from Settings
+    val hasServerConfig = viewModel.hasServerConfig()
+    val isSyncAvailable = !isOfflineMode && hasServerConfig
+    val canSync = isSyncAvailable && !isSyncing
+    
+    // Handle snackbar events from ViewModel
+    LaunchedEffect(Unit) {
+        viewModel.showSnackbar.collect { data ->
+            scope.launch {
+                val result = snackbarHostState.showSnackbar(
+                    message = data.message,
+                    actionLabel = data.actionLabel,
+                    duration = SnackbarDuration.Long
+                )
+                if (result == SnackbarResult.ActionPerformed) {
+                    data.onAction()
+                }
+            }
+        }
+    }
+    
+    // Phase 3: Scroll to top when new note created
+    // 🎨 v1.7.0: Unterstützt beide Display-Modi (list & grid)
+    LaunchedEffect(scrollToTop) {
+        if (scrollToTop) {
+            if (displayMode == "grid") {
+                gridState.animateScrollToItem(0)
+            } else {
+                listState.animateScrollToItem(0)
+            }
+            viewModel.resetScrollToTop()
+        }
+    }
+    
+    // v1.5.0 Hotfix: FAB manuell mit zIndex platzieren für garantierte Sichtbarkeit
+    Scaffold(
+        topBar = {
+            // Animated switch between normal and selection TopBar
+            AnimatedVisibility(
+                visible = isSelectionMode,
+                enter = slideInVertically() + fadeIn(),
+                exit = slideOutVertically() + fadeOut()
+            ) {
+                SelectionTopBar(
+                    selectedCount = selectedNotes.size,
+                    totalCount = notes.size,
+                    onCloseSelection = { viewModel.clearSelection() },
+                    onSelectAll = { viewModel.selectAllNotes() },
+                    onDeleteSelected = { showBatchDeleteDialog = true }
+                )
+            }
+            AnimatedVisibility(
+                visible = !isSelectionMode,
+                enter = slideInVertically() + fadeIn(),
+                exit = slideOutVertically() + fadeOut()
+            ) {
+                MainTopBar(
+                    syncEnabled = canSync,
+                    onSyncClick = { viewModel.triggerManualSync("toolbar") },
+                    onSettingsClick = onOpenSettings
+                )
+            }
+        },
+        // FAB wird manuell in Box platziert für korrekten z-Index
+        snackbarHost = { SnackbarHost(snackbarHostState) },
+        containerColor = MaterialTheme.colorScheme.surface
+    ) { paddingValues ->
+        // 🌟 v1.6.0: PullToRefreshBox only enabled when sync available
+        PullToRefreshBox(
+            isRefreshing = isSyncing,
+            onRefresh = { if (isSyncAvailable) viewModel.triggerManualSync("pullToRefresh") },
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(paddingValues)
+        ) {
+            Box(modifier = Modifier.fillMaxSize()) {
+                // Main content column
+                Column(modifier = Modifier.fillMaxSize()) {
+                    // Sync Status Banner (not affected by pull-to-refresh)
+                    SyncStatusBanner(
+                        syncState = syncState,
+                        message = syncMessage
+                    )
+                    
+                    // Content: Empty state or notes list
+                    if (notes.isEmpty()) {
+                        EmptyState(modifier = Modifier.weight(1f))
+                    } else {
+                        // 🎨 v1.7.0: Switch between List and Grid based on display mode
+                        if (displayMode == "grid") {
+                            NotesStaggeredGrid(
+                                notes = notes,
+                                gridState = gridState,
+                                showSyncStatus = viewModel.isServerConfigured(),
+                                selectedNoteIds = selectedNotes,
+                                isSelectionMode = isSelectionMode,
+                                modifier = Modifier.weight(1f),
+                                onNoteClick = { note ->
+                                    if (isSelectionMode) {
+                                        viewModel.toggleNoteSelection(note.id)
+                                    } else {
+                                        onOpenNote(note.id)
+                                    }
+                                },
+                                onNoteLongClick = { note ->
+                                    viewModel.startSelectionMode(note.id)
+                                }
+                            )
+                        } else {
+                            NotesList(
+                                notes = notes,
+                                showSyncStatus = viewModel.isServerConfigured(),
+                                selectedNotes = selectedNotes,
+                                isSelectionMode = isSelectionMode,
+                                listState = listState,
+                                modifier = Modifier.weight(1f),
+                                onNoteClick = { note -> onOpenNote(note.id) },
+                                onNoteLongPress = { note -> 
+                                    // Long-press starts selection mode
+                                    viewModel.startSelectionMode(note.id)
+                                },
+                                onNoteSelectionToggle = { note ->
+                                    viewModel.toggleNoteSelection(note.id)
+                                }
+                            )
+                        }
+                    }
+                }
+                
+                // FAB als TOP-LAYER - nur anzeigen wenn nicht im Selection Mode
+                AnimatedVisibility(
+                    visible = !isSelectionMode,
+                    enter = fadeIn(),
+                    exit = fadeOut(),
+                    modifier = Modifier
+                        .align(Alignment.BottomEnd)
+                        .padding(16.dp)
+                        .zIndex(Float.MAX_VALUE)
+                ) {
+                    NoteTypeFAB(
+                        onCreateNote = onCreateNote
+                    )
+                }
+            }
+        }
+        
+        // Batch Delete Confirmation Dialog
+        if (showBatchDeleteDialog) {
+            DeleteConfirmationDialog(
+                noteCount = selectedNotes.size,
+                isOfflineMode = isOfflineMode,
+                onDismiss = { showBatchDeleteDialog = false },
+                onDeleteLocal = {
+                    viewModel.deleteSelectedNotes(deleteFromServer = false)
+                    showBatchDeleteDialog = false
+                },
+                onDeleteEverywhere = {
+                    viewModel.deleteSelectedNotes(deleteFromServer = true)
+                    showBatchDeleteDialog = false
+                }
+            )
+        }
+    }
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+private fun MainTopBar(
+    syncEnabled: Boolean,
+    onSyncClick: () -> Unit,
+    onSettingsClick: () -> Unit
+) {
+    TopAppBar(
+        title = {
+            Text(
+                text = stringResource(R.string.main_title),
+                style = MaterialTheme.typography.titleLarge
+            )
+        },
+        actions = {
+            IconButton(
+                onClick = onSyncClick,
+                enabled = syncEnabled
+            ) {
+                Icon(
+                    imageVector = Icons.Default.Refresh,
+                    contentDescription = stringResource(R.string.action_sync)
+                )
+            }
+            IconButton(onClick = onSettingsClick) {
+                Icon(
+                    imageVector = Icons.Default.Settings,
+                    contentDescription = stringResource(R.string.action_settings)
+                )
+            }
+        },
+        colors = TopAppBarDefaults.topAppBarColors(
+            containerColor = MaterialTheme.colorScheme.surface,
+            titleContentColor = MaterialTheme.colorScheme.onSurface
+        )
+    )
+}
+
+/**
+ * Selection mode TopBar - shows selected count and actions
+ */
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+private fun SelectionTopBar(
+    selectedCount: Int,
+    totalCount: Int,
+    onCloseSelection: () -> Unit,
+    onSelectAll: () -> Unit,
+    onDeleteSelected: () -> Unit
+) {
+    TopAppBar(
+        navigationIcon = {
+            IconButton(onClick = onCloseSelection) {
+                Icon(
+                    imageVector = Icons.Default.Close,
+                    contentDescription = stringResource(R.string.action_close_selection)
+                )
+            }
+        },
+        title = {
+            Text(
+                text = stringResource(R.string.selection_count, selectedCount),
+                style = MaterialTheme.typography.titleLarge
+            )
+        },
+        actions = {
+            // Select All button (only if not all selected)
+            if (selectedCount < totalCount) {
+                IconButton(onClick = onSelectAll) {
+                    Icon(
+                        imageVector = Icons.Default.SelectAll,
+                        contentDescription = stringResource(R.string.action_select_all)
+                    )
+                }
+            }
+            // Delete button
+            IconButton(
+                onClick = onDeleteSelected,
+                enabled = selectedCount > 0
+            ) {
+                Icon(
+                    imageVector = Icons.Default.Delete,
+                    contentDescription = stringResource(R.string.action_delete_selected),
+                    tint = if (selectedCount > 0) {
+                        MaterialTheme.colorScheme.error
+                    } else {
+                        MaterialTheme.colorScheme.onSurface.copy(alpha = 0.38f)
+                    }
+                )
+            }
+        },
+        colors = TopAppBarDefaults.topAppBarColors(
+            containerColor = MaterialTheme.colorScheme.primaryContainer,
+            titleContentColor = MaterialTheme.colorScheme.onPrimaryContainer,
+            navigationIconContentColor = MaterialTheme.colorScheme.onPrimaryContainer,
+            actionIconContentColor = MaterialTheme.colorScheme.onPrimaryContainer
+        )
+    )
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/MainViewModel.kt

@@ -0,0 +1,704 @@
+package dev.dettmer.simplenotes.ui.main
+
+import android.app.Application
+import android.content.Context
+import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.viewModelScope
+import dev.dettmer.simplenotes.models.Note
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.storage.NotesStorage
+import dev.dettmer.simplenotes.sync.SyncStateManager
+import dev.dettmer.simplenotes.sync.WebDavSyncService
+import dev.dettmer.simplenotes.utils.Constants
+import dev.dettmer.simplenotes.utils.Logger
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.SharedFlow
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asSharedFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+
+/**
+ * ViewModel for MainActivity Compose
+ * v1.5.0: Jetpack Compose MainActivity Redesign
+ * 
+ * Manages notes list, sync state, and deletion with undo.
+ */
+class MainViewModel(application: Application) : AndroidViewModel(application) {
+    
+    companion object {
+        private const val TAG = "MainViewModel"
+        private const val MIN_AUTO_SYNC_INTERVAL_MS = 60_000L // 1 Minute
+        private const val PREF_LAST_AUTO_SYNC_TIME = "last_auto_sync_timestamp"
+    }
+    
+    private val storage = NotesStorage(application)
+    private val prefs = application.getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Notes State
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    private val _notes = MutableStateFlow<List<Note>>(emptyList())
+    val notes: StateFlow<List<Note>> = _notes.asStateFlow()
+    
+    private val _pendingDeletions = MutableStateFlow<Set<String>>(emptySet())
+    val pendingDeletions: StateFlow<Set<String>> = _pendingDeletions.asStateFlow()
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Multi-Select State (v1.5.0)
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    private val _selectedNotes = MutableStateFlow<Set<String>>(emptySet())
+    val selectedNotes: StateFlow<Set<String>> = _selectedNotes.asStateFlow()
+    
+    val isSelectionMode: StateFlow<Boolean> = _selectedNotes
+        .map { it.isNotEmpty() }
+        .stateIn(viewModelScope, SharingStarted.WhileSubscribed(5000), false)
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // 🌟 v1.6.0: Offline Mode State (reactive)
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    private val _isOfflineMode = MutableStateFlow(
+        prefs.getBoolean(Constants.KEY_OFFLINE_MODE, true)
+    )
+    val isOfflineMode: StateFlow<Boolean> = _isOfflineMode.asStateFlow()
+    
+    /**
+     * Refresh offline mode state from SharedPreferences
+     * Called when returning from Settings screen (in onResume)
+     */
+    fun refreshOfflineModeState() {
+        val oldValue = _isOfflineMode.value
+        val newValue = prefs.getBoolean(Constants.KEY_OFFLINE_MODE, true)
+        _isOfflineMode.value = newValue
+        Logger.d(TAG, "🔄 refreshOfflineModeState: offlineMode=$oldValue → $newValue")
+    }
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // 🎨 v1.7.0: Display Mode State
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    private val _displayMode = MutableStateFlow(
+        prefs.getString(Constants.KEY_DISPLAY_MODE, Constants.DEFAULT_DISPLAY_MODE) ?: Constants.DEFAULT_DISPLAY_MODE
+    )
+    val displayMode: StateFlow<String> = _displayMode.asStateFlow()
+    
+    /**
+     * Refresh display mode from SharedPreferences
+     * Called when returning from Settings screen
+     */
+    fun refreshDisplayMode() {
+        val newValue = prefs.getString(Constants.KEY_DISPLAY_MODE, Constants.DEFAULT_DISPLAY_MODE) ?: Constants.DEFAULT_DISPLAY_MODE
+        _displayMode.value = newValue
+        Logger.d(TAG, "🔄 refreshDisplayMode: displayMode=${_displayMode.value} → $newValue")
+    }
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Sync State (derived from SyncStateManager)
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    private val _syncState = MutableStateFlow(SyncStateManager.SyncState.IDLE)
+    val syncState: StateFlow<SyncStateManager.SyncState> = _syncState.asStateFlow()
+    
+    private val _syncMessage = MutableStateFlow<String?>(null)
+    val syncMessage: StateFlow<String?> = _syncMessage.asStateFlow()
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // UI Events
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    private val _showToast = MutableSharedFlow<String>()
+    val showToast: SharedFlow<String> = _showToast.asSharedFlow()
+    
+    private val _showDeleteDialog = MutableSharedFlow<DeleteDialogData>()
+    val showDeleteDialog: SharedFlow<DeleteDialogData> = _showDeleteDialog.asSharedFlow()
+    
+    private val _showSnackbar = MutableSharedFlow<SnackbarData>()
+    val showSnackbar: SharedFlow<SnackbarData> = _showSnackbar.asSharedFlow()
+    
+    // Phase 3: Scroll-to-top when new note is created
+    private val _scrollToTop = MutableStateFlow(false)
+    val scrollToTop: StateFlow<Boolean> = _scrollToTop.asStateFlow()
+    
+    // Track first note ID to detect new notes
+    private var previousFirstNoteId: String? = null
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Data Classes
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    data class DeleteDialogData(
+        val note: Note,
+        val originalList: List<Note>
+    )
+    
+    data class SnackbarData(
+        val message: String,
+        val actionLabel: String,
+        val onAction: () -> Unit
+    )
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Initialization
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    init {
+        // v1.5.0 Performance: Load notes asynchronously to avoid blocking UI
+        viewModelScope.launch(Dispatchers.IO) {
+            loadNotesAsync()
+        }
+    }
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Notes Actions
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    /**
+     * Load notes asynchronously on IO dispatcher
+     * This prevents UI blocking during app startup
+     */
+    private suspend fun loadNotesAsync() {
+        val allNotes = storage.loadAllNotes()
+        val pendingIds = _pendingDeletions.value
+        val filteredNotes = allNotes.filter { it.id !in pendingIds }
+        
+        withContext(Dispatchers.Main) {
+            // Phase 3: Detect if a new note was added at the top
+            val newFirstNoteId = filteredNotes.firstOrNull()?.id
+            if (newFirstNoteId != null && 
+                previousFirstNoteId != null && 
+                newFirstNoteId != previousFirstNoteId) {
+                // New note at top → trigger scroll
+                _scrollToTop.value = true
+                Logger.d(TAG, "📜 New note detected at top, triggering scroll-to-top")
+            }
+            previousFirstNoteId = newFirstNoteId
+            
+            _notes.value = filteredNotes
+        }
+    }
+    
+    /**
+     * Public loadNotes - delegates to async version
+     */
+    fun loadNotes() {
+        viewModelScope.launch(Dispatchers.IO) {
+            loadNotesAsync()
+        }
+    }
+    
+    /**
+     * Reset scroll-to-top flag after scroll completed
+     */
+    fun resetScrollToTop() {
+        _scrollToTop.value = false
+    }
+    
+    /**
+     * Force scroll to top (e.g., after returning from editor)
+     */
+    fun scrollToTop() {
+        _scrollToTop.value = true
+    }
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Multi-Select Actions (v1.5.0)
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    /**
+     * Toggle selection of a note
+     */
+    fun toggleNoteSelection(noteId: String) {
+        _selectedNotes.value = if (noteId in _selectedNotes.value) {
+            _selectedNotes.value - noteId
+        } else {
+            _selectedNotes.value + noteId
+        }
+    }
+    
+    /**
+     * Start selection mode with initial note
+     */
+    fun startSelectionMode(noteId: String) {
+        _selectedNotes.value = setOf(noteId)
+    }
+    
+    /**
+     * Select all notes
+     */
+    fun selectAllNotes() {
+        _selectedNotes.value = _notes.value.map { it.id }.toSet()
+    }
+    
+    /**
+     * Clear selection and exit selection mode
+     */
+    fun clearSelection() {
+        _selectedNotes.value = emptySet()
+    }
+    
+    /**
+     * Get count of selected notes
+     */
+    fun getSelectedCount(): Int = _selectedNotes.value.size
+    
+    /**
+     * Delete all selected notes
+     */
+    fun deleteSelectedNotes(deleteFromServer: Boolean) {
+        val selectedIds = _selectedNotes.value.toList()
+        val selectedNotes = _notes.value.filter { it.id in selectedIds }
+        
+        if (selectedNotes.isEmpty()) return
+        
+        // Add to pending deletions
+        _pendingDeletions.value = _pendingDeletions.value + selectedIds.toSet()
+        
+        // Delete from storage
+        selectedNotes.forEach { note ->
+            storage.deleteNote(note.id)
+        }
+        
+        // Clear selection
+        clearSelection()
+        
+        // Reload notes
+        loadNotes()
+        
+        // Show snackbar with undo
+        val count = selectedNotes.size
+        val message = if (deleteFromServer) {
+            getString(R.string.snackbar_notes_deleted_server, count)
+        } else {
+            getString(R.string.snackbar_notes_deleted_local, count)
+        }
+        
+        viewModelScope.launch {
+            _showSnackbar.emit(SnackbarData(
+                message = message,
+                actionLabel = getString(R.string.snackbar_undo),
+                onAction = {
+                    undoDeleteMultiple(selectedNotes)
+                }
+            ))
+            
+            @Suppress("MagicNumber") // Snackbar timing coordination
+            // If delete from server, actually delete after a short delay
+            // (to allow undo action before server deletion)
+            if (deleteFromServer) {
+                kotlinx.coroutines.delay(3500) // Snackbar shows for ~3s
+                // Only delete if not restored (check if still in pending)
+                val idsToDelete = selectedIds.filter { it in _pendingDeletions.value }
+                if (idsToDelete.isNotEmpty()) {
+                    deleteMultipleNotesFromServer(idsToDelete)
+                }
+            } else {
+                // Just finalize local deletion
+                selectedIds.forEach { noteId ->
+                    finalizeDeletion(noteId)
+                }
+            }
+        }
+    }
+    
+    /**
+     * Undo deletion of multiple notes
+     */
+    private fun undoDeleteMultiple(notes: List<Note>) {
+        // Remove from pending deletions
+        _pendingDeletions.value = _pendingDeletions.value - notes.map { it.id }.toSet()
+        
+        // Restore to storage
+        notes.forEach { note ->
+            storage.saveNote(note)
+        }
+        
+        // Reload notes
+        loadNotes()
+    }
+
+    /**
+     * Called when user long-presses a note to delete
+     * Shows dialog for delete confirmation (replaces swipe-to-delete for performance)
+     */
+    fun onNoteLongPressDelete(note: Note) {
+        val alwaysDeleteFromServer = prefs.getBoolean(Constants.KEY_ALWAYS_DELETE_FROM_SERVER, false)
+        
+        // Store original list for potential restore
+        val originalList = _notes.value.toList()
+        
+        if (alwaysDeleteFromServer) {
+            // Auto-delete without dialog
+            deleteNoteConfirmed(note, deleteFromServer = true)
+        } else {
+            // Show dialog - don't remove from UI yet (user can cancel)
+            viewModelScope.launch {
+                _showDeleteDialog.emit(DeleteDialogData(note, originalList))
+            }
+        }
+    }
+
+    /**
+     * Called when user swipes to delete a note (legacy - kept for compatibility)
+     * Shows dialog if "always delete from server" is not enabled
+     */
+    fun onNoteSwipedToDelete(note: Note) {
+        onNoteLongPressDelete(note)  // Delegate to long-press handler
+    }
+    
+    /**
+     * Restore note after swipe (user cancelled dialog)
+     */
+    fun restoreNoteAfterSwipe(originalList: List<Note>) {
+        _notes.value = originalList
+    }
+    
+    /**
+     * Confirm note deletion (from dialog or auto-delete)
+     */
+    fun deleteNoteConfirmed(note: Note, deleteFromServer: Boolean) {
+        // Add to pending deletions
+        _pendingDeletions.value = _pendingDeletions.value + note.id
+        
+        // Delete from storage
+        storage.deleteNote(note.id)
+        
+        // Reload notes
+        loadNotes()
+        
+        // Show snackbar with undo
+        val message = if (deleteFromServer) {
+            getString(R.string.snackbar_note_deleted_server, note.title)
+        } else {
+            getString(R.string.snackbar_note_deleted_local, note.title)
+        }
+        
+        viewModelScope.launch {
+            _showSnackbar.emit(SnackbarData(
+                message = message,
+                actionLabel = getString(R.string.snackbar_undo),
+                onAction = {
+                    undoDelete(note)
+                }
+            ))
+            
+            @Suppress("MagicNumber") // Snackbar timing
+            // If delete from server, actually delete after snackbar timeout
+            if (deleteFromServer) {
+                kotlinx.coroutines.delay(3500) // Snackbar shows for ~3s
+                // Only delete if not restored (check if still in pending)
+                if (note.id in _pendingDeletions.value) {
+                    deleteNoteFromServer(note.id)
+                }
+            } else {
+                // Just finalize local deletion
+                finalizeDeletion(note.id)
+            }
+        }
+    }
+    
+    /**
+     * Undo note deletion
+     */
+    fun undoDelete(note: Note) {
+        // Remove from pending deletions
+        _pendingDeletions.value = _pendingDeletions.value - note.id
+        
+        // Restore to storage
+        storage.saveNote(note)
+        
+        // Reload notes
+        loadNotes()
+    }
+    
+    /**
+     * Actually delete note from server after snackbar dismissed
+     */
+    fun deleteNoteFromServer(noteId: String) {
+        viewModelScope.launch {
+            try {
+                val webdavService = WebDavSyncService(getApplication())
+                val success = withContext(Dispatchers.IO) {
+                    webdavService.deleteNoteFromServer(noteId)
+                }
+                
+                if (success) {
+                    _showToast.emit(getString(R.string.snackbar_deleted_from_server))
+                } else {
+                    _showToast.emit(getString(R.string.snackbar_server_delete_failed))
+                }
+            } catch (e: Exception) {
+                _showToast.emit(getString(R.string.snackbar_server_error, e.message ?: ""))
+            } finally {
+                // Remove from pending deletions
+                _pendingDeletions.value = _pendingDeletions.value - noteId
+            }
+        }
+    }
+    
+    /**
+     * Delete multiple notes from server with aggregated toast
+     * Shows single toast at the end instead of one per note
+     */
+    private fun deleteMultipleNotesFromServer(noteIds: List<String>) {
+        viewModelScope.launch {
+            val webdavService = WebDavSyncService(getApplication())
+            var successCount = 0
+            var failCount = 0
+            
+            noteIds.forEach { noteId ->
+                try {
+                    val success = withContext(Dispatchers.IO) {
+                        webdavService.deleteNoteFromServer(noteId)
+                    }
+                    if (success) successCount++ else failCount++
+                } catch (e: Exception) {
+                    Logger.w(TAG, "Failed to delete note $noteId from server: ${e.message}")
+                    failCount++
+                } finally {
+                    _pendingDeletions.value = _pendingDeletions.value - noteId
+                }
+            }
+            
+            // Show aggregated toast
+            val message = when {
+                failCount == 0 -> getString(R.string.snackbar_notes_deleted_from_server, successCount)
+                successCount == 0 -> getString(R.string.snackbar_server_delete_failed)
+                else -> getString(
+                    R.string.snackbar_notes_deleted_from_server_partial,
+                    successCount,
+                    successCount + failCount
+                )
+            }
+            _showToast.emit(message)
+        }
+    }
+    
+    /**
+     * Finalize deletion (remove from pending set)
+     */
+    fun finalizeDeletion(noteId: String) {
+        _pendingDeletions.value = _pendingDeletions.value - noteId
+    }
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Sync Actions
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    fun updateSyncState(status: SyncStateManager.SyncStatus) {
+        _syncState.value = status.state
+        _syncMessage.value = status.message
+    }
+    
+    /**
+     * Trigger manual sync (from toolbar button or pull-to-refresh)
+     * v1.7.0: Uses central canSync() gate for WiFi-only check
+     */
+    fun triggerManualSync(source: String = "manual") {
+        // 🆕 v1.7.0: Zentrale Sync-Gate Prüfung (inkl. WiFi-Only, Offline Mode, Server Config)
+        val syncService = WebDavSyncService(getApplication())
+        val gateResult = syncService.canSync()
+        if (!gateResult.canSync) {
+            if (gateResult.isBlockedByWifiOnly) {
+                Logger.d(TAG, "⏭️ $source Sync blocked: WiFi-only mode, not on WiFi")
+                SyncStateManager.markError(getString(R.string.sync_wifi_only_hint))
+            } else {
+                Logger.d(TAG, "⏭️ $source Sync blocked: ${gateResult.blockReason ?: "offline/no server"}")
+            }
+            return
+        }
+        
+        // 🆕 v1.7.0: Feedback wenn Sync bereits läuft
+        if (!SyncStateManager.tryStartSync(source)) {
+            if (SyncStateManager.isSyncing) {
+                Logger.d(TAG, "⏭️ $source Sync blocked: Another sync in progress")
+                viewModelScope.launch {
+                    _showSnackbar.emit(SnackbarData(
+                        message = getString(R.string.sync_already_running),
+                        actionLabel = "",
+                        onAction = {}
+                    ))
+                }
+            }
+            return
+        }
+        
+        viewModelScope.launch {
+            try {
+                // Check for unsynced changes
+                if (!syncService.hasUnsyncedChanges()) {
+                    Logger.d(TAG, "⏭️ $source Sync: No unsynced changes")
+                    val message = getApplication<Application>().getString(R.string.toast_already_synced)
+                    SyncStateManager.markCompleted(message)
+                    loadNotes()
+                    return@launch
+                }
+                
+                // Check server reachability
+                val isReachable = withContext(Dispatchers.IO) {
+                    syncService.isServerReachable()
+                }
+                
+                if (!isReachable) {
+                    Logger.d(TAG, "⏭️ $source Sync: Server not reachable")
+                    SyncStateManager.markError(getString(R.string.snackbar_server_unreachable))
+                    return@launch
+                }
+                
+                // Perform sync
+                val result = withContext(Dispatchers.IO) {
+                    syncService.syncNotes()
+                }
+                
+                if (result.isSuccess) {
+                    val bannerMessage = if (result.syncedCount > 0) {
+                        getString(R.string.toast_sync_success, result.syncedCount)
+                    } else {
+                        getString(R.string.snackbar_nothing_to_sync)
+                    }
+                    SyncStateManager.markCompleted(bannerMessage)
+                    loadNotes()
+                } else {
+                    SyncStateManager.markError(result.errorMessage)
+                }
+            } catch (e: Exception) {
+                SyncStateManager.markError(e.message)
+            }
+        }
+    }
+    
+    /**
+     * Trigger auto-sync (onResume)
+     * Only runs if server is configured and interval has passed
+     * v1.5.0: Silent-Sync - kein Banner während des Syncs, Fehler werden trotzdem angezeigt
+     * v1.6.0: Configurable trigger - checks KEY_SYNC_TRIGGER_ON_RESUME
+     * v1.7.0: Uses central canSync() gate for WiFi-only check
+     */
+    fun triggerAutoSync(source: String = "auto") {
+        // 🌟 v1.6.0: Check if onResume trigger is enabled
+        if (!prefs.getBoolean(Constants.KEY_SYNC_TRIGGER_ON_RESUME, Constants.DEFAULT_TRIGGER_ON_RESUME)) {
+            Logger.d(TAG, "⏭️ onResume sync disabled - skipping")
+            return
+        }
+        
+        // Throttling check
+        if (!canTriggerAutoSync()) {
+            return
+        }
+        
+        // 🆕 v1.7.0: Zentrale Sync-Gate Prüfung (inkl. WiFi-Only, Offline Mode, Server Config)
+        val syncService = WebDavSyncService(getApplication())
+        val gateResult = syncService.canSync()
+        if (!gateResult.canSync) {
+            if (gateResult.isBlockedByWifiOnly) {
+                Logger.d(TAG, "⏭️ Auto-sync ($source) blocked: WiFi-only mode, not on WiFi")
+            } else {
+                Logger.d(TAG, "⏭️ Auto-sync ($source) blocked: ${gateResult.blockReason ?: "offline/no server"}")
+            }
+            return
+        }
+        
+        // v1.5.0: silent=true - kein Banner bei Auto-Sync, aber Fehler werden trotzdem angezeigt
+        if (!SyncStateManager.tryStartSync("auto-$source", silent = true)) {
+            Logger.d(TAG, "⏭️ Auto-sync ($source): Another sync already in progress")
+            return
+        }
+        
+        Logger.d(TAG, "🔄 Auto-sync triggered ($source)")
+        
+        // Update last sync timestamp
+        prefs.edit().putLong(PREF_LAST_AUTO_SYNC_TIME, System.currentTimeMillis()).apply()
+        
+        viewModelScope.launch {
+            try {
+                // Check for unsynced changes
+                if (!syncService.hasUnsyncedChanges()) {
+                    Logger.d(TAG, "⏭️ Auto-sync ($source): No unsynced changes - skipping")
+                    SyncStateManager.reset()
+                    return@launch
+                }
+                
+                // Check server reachability
+                val isReachable = withContext(Dispatchers.IO) {
+                    syncService.isServerReachable()
+                }
+                
+                if (!isReachable) {
+                    Logger.d(TAG, "⏭️ Auto-sync ($source): Server not reachable - skipping silently")
+                    SyncStateManager.reset()
+                    return@launch
+                }
+                
+                // Perform sync
+                val result = withContext(Dispatchers.IO) {
+                    syncService.syncNotes()
+                }
+                
+                if (result.isSuccess && result.syncedCount > 0) {
+                    Logger.d(TAG, "✅ Auto-sync successful ($source): ${result.syncedCount} notes")
+                    SyncStateManager.markCompleted(getString(R.string.toast_sync_success, result.syncedCount))
+                    _showToast.emit(getString(R.string.snackbar_synced_count, result.syncedCount))
+                    loadNotes()
+                } else if (result.isSuccess) {
+                    Logger.d(TAG, "ℹ️ Auto-sync ($source): No changes")
+                    SyncStateManager.markCompleted(getString(R.string.snackbar_nothing_to_sync))
+                } else {
+                    Logger.e(TAG, "❌ Auto-sync failed ($source): ${result.errorMessage}")
+                    SyncStateManager.markError(result.errorMessage)
+                }
+            } catch (e: Exception) {
+                Logger.e(TAG, "💥 Auto-sync exception ($source): ${e.message}")
+                SyncStateManager.markError(e.message)
+            }
+        }
+    }
+    
+    private fun canTriggerAutoSync(): Boolean {
+        val lastSyncTime = prefs.getLong(PREF_LAST_AUTO_SYNC_TIME, 0)
+        val now = System.currentTimeMillis()
+        val timeSinceLastSync = now - lastSyncTime
+        
+        if (timeSinceLastSync < MIN_AUTO_SYNC_INTERVAL_MS) {
+            val remainingSeconds = (MIN_AUTO_SYNC_INTERVAL_MS - timeSinceLastSync) / 1000
+            Logger.d(TAG, "⏳ Auto-sync throttled - wait ${remainingSeconds}s")
+            return false
+        }
+        
+        return true
+    }
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Helpers
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    private fun getString(resId: Int): String = getApplication<android.app.Application>().getString(resId)
+    
+    private fun getString(resId: Int, vararg formatArgs: Any): String = 
+        getApplication<android.app.Application>().getString(resId, *formatArgs)
+    
+    fun isServerConfigured(): Boolean {
+        // 🌟 v1.6.0: Use reactive offline mode state
+        if (_isOfflineMode.value) {
+            return false
+        }
+        val serverUrl = prefs.getString(Constants.KEY_SERVER_URL, null)
+        return !serverUrl.isNullOrEmpty() && serverUrl != "http://" && serverUrl != "https://"
+    }
+    
+    /**
+     * 🌟 v1.6.0: Check if server has a configured URL (ignores offline mode)
+     * Used for determining if sync would be available when offline mode is disabled
+     */
+    fun hasServerConfig(): Boolean {
+        val serverUrl = prefs.getString(Constants.KEY_SERVER_URL, null)
+        return !serverUrl.isNullOrEmpty() && serverUrl != "http://" && serverUrl != "https://"
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/components/DeleteConfirmationDialog.kt

@@ -0,0 +1,144 @@
+package dev.dettmer.simplenotes.ui.main.components
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.CloudOff
+import androidx.compose.material3.AlertDialog
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.HorizontalDivider
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.R
+
+/**
+ * Delete confirmation dialog with server/local options
+ * v1.5.0: Multi-Select Feature
+ * v1.6.0: Offline mode support - disables server deletion option
+ */
+@Composable
+fun DeleteConfirmationDialog(
+    noteCount: Int = 1,
+    isOfflineMode: Boolean = false,
+    onDismiss: () -> Unit,
+    onDeleteLocal: () -> Unit,
+    onDeleteEverywhere: () -> Unit
+) {
+    val title = if (noteCount == 1) {
+        stringResource(R.string.delete_note_title)
+    } else {
+        stringResource(R.string.delete_notes_title, noteCount)
+    }
+    
+    val message = if (noteCount == 1) {
+        stringResource(R.string.delete_note_message)
+    } else {
+        stringResource(R.string.delete_notes_message, noteCount)
+    }
+    
+    AlertDialog(
+        onDismissRequest = onDismiss,
+        title = {
+            Text(
+                text = title,
+                style = MaterialTheme.typography.headlineSmall
+            )
+        },
+        text = {
+            Text(
+                text = message,
+                style = MaterialTheme.typography.bodyMedium
+            )
+        },
+        confirmButton = {
+            Column(
+                modifier = Modifier.fillMaxWidth(),
+                verticalArrangement = Arrangement.spacedBy(8.dp)
+            ) {
+                // Delete everywhere (server + local) - primary action
+                // 🌟 v1.6.0: Disabled in offline mode with visual hint
+                TextButton(
+                    onClick = onDeleteEverywhere,
+                    modifier = Modifier.fillMaxWidth(),
+                    enabled = !isOfflineMode,
+                    colors = ButtonDefaults.textButtonColors(
+                        contentColor = MaterialTheme.colorScheme.error,
+                        disabledContentColor = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.38f)
+                    )
+                ) {
+                    Text(stringResource(R.string.delete_everywhere))
+                }
+                
+                // 🌟 v1.6.0: Show offline hint in a subtle Surface container
+                if (isOfflineMode) {
+                    Surface(
+                        modifier = Modifier
+                            .align(Alignment.CenterHorizontally)
+                            .padding(horizontal = 8.dp),
+                        color = MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.5f),
+                        shape = MaterialTheme.shapes.small
+                    ) {
+                        Row(
+                            modifier = Modifier.padding(horizontal = 12.dp, vertical = 8.dp),
+                            verticalAlignment = Alignment.CenterVertically,
+                            horizontalArrangement = Arrangement.Center
+                        ) {
+                            Icon(
+                                imageVector = Icons.Default.CloudOff,
+                                contentDescription = null,
+                                tint = MaterialTheme.colorScheme.tertiary,
+                                modifier = Modifier.size(16.dp)
+                            )
+                            Spacer(modifier = Modifier.size(8.dp))
+                            Text(
+                                text = stringResource(R.string.delete_everywhere_offline_hint),
+                                style = MaterialTheme.typography.bodySmall,
+                                color = MaterialTheme.colorScheme.tertiary
+                            )
+                        }
+                    }
+                    
+                    Spacer(modifier = Modifier.height(4.dp))
+                    HorizontalDivider(
+                        modifier = Modifier.padding(horizontal = 16.dp),
+                        color = MaterialTheme.colorScheme.outlineVariant
+                    )
+                    Spacer(modifier = Modifier.height(4.dp))
+                }
+                
+                // Delete local only
+                TextButton(
+                    onClick = onDeleteLocal,
+                    modifier = Modifier.fillMaxWidth()
+                ) {
+                    Text(stringResource(R.string.delete_local_only))
+                }
+                
+                Spacer(modifier = Modifier.height(8.dp))
+                
+                // Cancel button
+                TextButton(
+                    onClick = onDismiss,
+                    modifier = Modifier.fillMaxWidth()
+                ) {
+                    Text(stringResource(R.string.cancel))
+                }
+            }
+        },
+        dismissButton = null // All buttons in confirmButton column
+    )
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/components/EmptyState.kt

@@ -0,0 +1,98 @@
+package dev.dettmer.simplenotes.ui.main.components
+
+import android.graphics.Bitmap
+import android.graphics.Canvas
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.Card
+import androidx.compose.material3.CardDefaults
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.asImageBitmap
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import androidx.core.content.ContextCompat
+import dev.dettmer.simplenotes.R
+
+/**
+ * Empty state card shown when no notes exist
+ * v1.5.0: Jetpack Compose MainActivity Redesign
+ */
+@Composable
+fun EmptyState(
+    modifier: Modifier = Modifier
+) {
+    Column(
+        modifier = modifier.fillMaxSize(),
+        horizontalAlignment = Alignment.CenterHorizontally,
+        verticalArrangement = Arrangement.Center
+    ) {
+        Card(
+            modifier = Modifier.padding(horizontal = 32.dp),
+            shape = RoundedCornerShape(16.dp),
+            colors = CardDefaults.cardColors(
+                containerColor = MaterialTheme.colorScheme.surfaceContainerHigh
+            )
+        ) {
+            Column(
+                modifier = Modifier.padding(32.dp),
+                horizontalAlignment = Alignment.CenterHorizontally
+            ) {
+                // App icon foreground (transparent background)
+                val context = LocalContext.current
+                val appIcon = remember {
+                    val drawable = ContextCompat.getDrawable(context, R.mipmap.ic_launcher_foreground)
+                    drawable?.let {
+                        val size = 256
+                        val bitmap = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888)
+                        val canvas = Canvas(bitmap)
+                        it.setBounds(0, 0, size, size)
+                        it.draw(canvas)
+                        bitmap.asImageBitmap()
+                    }
+                }
+                
+                appIcon?.let {
+                    Image(
+                        bitmap = it,
+                        contentDescription = null,
+                        modifier = Modifier.size(96.dp)
+                    )
+                }
+                
+                Spacer(modifier = Modifier.height(16.dp))
+                
+                // Title
+                Text(
+                    text = stringResource(R.string.empty_state_title),
+                    style = MaterialTheme.typography.headlineSmall,
+                    color = MaterialTheme.colorScheme.onSurface,
+                    textAlign = TextAlign.Center
+                )
+                
+                Spacer(modifier = Modifier.height(8.dp))
+                
+                // Message
+                Text(
+                    text = stringResource(R.string.empty_state_message),
+                    style = MaterialTheme.typography.bodyMedium,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    textAlign = TextAlign.Center
+                )
+            }
+        }
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/components/NoteCard.kt

@@ -0,0 +1,240 @@
+package dev.dettmer.simplenotes.ui.main.components
+
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.fadeIn
+import androidx.compose.animation.fadeOut
+import androidx.compose.animation.scaleIn
+import androidx.compose.animation.scaleOut
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.gestures.detectTapGestures
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.outlined.List
+import androidx.compose.material.icons.filled.Check
+import androidx.compose.material.icons.filled.Warning
+import androidx.compose.material.icons.outlined.CloudDone
+import androidx.compose.material.icons.outlined.CloudOff
+import androidx.compose.material.icons.outlined.CloudSync
+import androidx.compose.material.icons.outlined.Description
+import androidx.compose.material3.Card
+import androidx.compose.material3.CardDefaults
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.models.Note
+import dev.dettmer.simplenotes.models.NoteType
+import dev.dettmer.simplenotes.models.SyncStatus
+import dev.dettmer.simplenotes.utils.toReadableTime
+
+/**
+ * Note card - v1.5.0 with Multi-Select Support
+ * 
+ * ULTRA SIMPLE + SELECTION:
+ * - NO remember() anywhere
+ * - Direct MaterialTheme access
+ * - Selection indicator via border + checkbox overlay
+ * - Long-press starts selection mode
+ * - Tap in selection mode toggles selection
+ */
+@Composable
+fun NoteCard(
+    note: Note,
+    showSyncStatus: Boolean,
+    isSelected: Boolean = false,
+    isSelectionMode: Boolean = false,
+    modifier: Modifier = Modifier,
+    onClick: () -> Unit,
+    onLongClick: () -> Unit
+) {
+    val context = LocalContext.current
+    
+    Card(
+        modifier = modifier
+            .fillMaxWidth()
+            // 🎨 v1.7.0: Externes Padding entfernt - Grid/Liste steuert Abstände
+            .then(
+                if (isSelected) {
+                    Modifier.border(
+                        width = 2.dp,
+                        color = MaterialTheme.colorScheme.primary,
+                        shape = RoundedCornerShape(16.dp)
+                    )
+                } else Modifier
+            )
+            .pointerInput(note.id, isSelectionMode) {
+                detectTapGestures(
+                    onTap = { onClick() },
+                    onLongPress = { onLongClick() }
+                )
+            },
+        shape = RoundedCornerShape(16.dp),
+        elevation = CardDefaults.cardElevation(defaultElevation = 0.dp),
+        colors = CardDefaults.cardColors(
+            containerColor = if (isSelected) {
+                MaterialTheme.colorScheme.primaryContainer.copy(alpha = 0.3f)
+            } else {
+                MaterialTheme.colorScheme.surfaceContainerHigh
+            }
+        )
+    ) {
+        Box {
+            Column(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(16.dp)
+            ) {
+                // Header row
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    // Type icon
+                    Box(
+                        modifier = Modifier
+                            .size(32.dp)
+                            .background(
+                                MaterialTheme.colorScheme.primaryContainer,
+                                CircleShape
+                            ),
+                        contentAlignment = Alignment.Center
+                    ) {
+                        Icon(
+                            imageVector = if (note.noteType == NoteType.TEXT) 
+                                Icons.Outlined.Description 
+                            else 
+                                Icons.AutoMirrored.Outlined.List,
+                            contentDescription = null,
+                            tint = MaterialTheme.colorScheme.onPrimaryContainer,
+                            modifier = Modifier.size(16.dp)
+                        )
+                    }
+                    
+                    Spacer(modifier = Modifier.width(12.dp))
+                    
+                    // Title
+                    Text(
+                        text = note.title.ifEmpty { stringResource(R.string.untitled) },
+                        style = MaterialTheme.typography.titleMedium,
+                        color = MaterialTheme.colorScheme.onSurface,
+                        maxLines = 2,
+                        overflow = TextOverflow.Ellipsis,
+                        modifier = Modifier.weight(1f)
+                    )
+                }
+                
+                Spacer(modifier = Modifier.height(8.dp))
+                
+                // Preview
+                Text(
+                    text = when (note.noteType) {
+                        NoteType.TEXT -> note.content.take(100)
+                        NoteType.CHECKLIST -> {
+                            val items = note.checklistItems ?: emptyList()
+                            stringResource(R.string.checklist_progress, items.count { it.isChecked }, items.size)
+                        }
+                    },
+                    style = MaterialTheme.typography.bodyMedium,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    maxLines = 3,
+                    overflow = TextOverflow.Ellipsis
+                )
+                
+                Spacer(modifier = Modifier.height(8.dp))
+                
+                // Footer
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    Text(
+                        text = note.updatedAt.toReadableTime(context),
+                        style = MaterialTheme.typography.labelSmall,
+                        color = MaterialTheme.colorScheme.outline,
+                        modifier = Modifier.weight(1f)
+                    )
+                    
+                    if (showSyncStatus) {
+                        Icon(
+                            imageVector = when (note.syncStatus) {
+                                SyncStatus.SYNCED -> Icons.Outlined.CloudDone
+                                SyncStatus.PENDING -> Icons.Outlined.CloudSync
+                                SyncStatus.CONFLICT -> Icons.Default.Warning
+                                SyncStatus.LOCAL_ONLY -> Icons.Outlined.CloudOff
+                            },
+                            contentDescription = null,
+                            tint = when (note.syncStatus) {
+                                SyncStatus.SYNCED -> MaterialTheme.colorScheme.primary
+                                SyncStatus.CONFLICT -> MaterialTheme.colorScheme.error
+                                else -> MaterialTheme.colorScheme.outline
+                            },
+                            modifier = Modifier.size(16.dp)
+                        )
+                    }
+                }
+            }
+            
+            // Selection indicator checkbox (top-right)
+            androidx.compose.animation.AnimatedVisibility(
+                visible = isSelectionMode,
+                enter = fadeIn() + scaleIn(),
+                exit = fadeOut() + scaleOut(),
+                modifier = Modifier
+                    .align(Alignment.TopEnd)
+                    .padding(8.dp)
+            ) {
+                Box(
+                    modifier = Modifier
+                        .size(24.dp)
+                        .clip(CircleShape)
+                        .background(
+                            if (isSelected) {
+                                MaterialTheme.colorScheme.primary
+                            } else {
+                                MaterialTheme.colorScheme.surfaceContainerHighest
+                            }
+                        )
+                        .border(
+                            width = 2.dp,
+                            color = if (isSelected) {
+                                MaterialTheme.colorScheme.primary
+                            } else {
+                                MaterialTheme.colorScheme.outline
+                            },
+                            shape = CircleShape
+                        ),
+                    contentAlignment = Alignment.Center
+                ) {
+                    if (isSelected) {
+                        Icon(
+                            imageVector = Icons.Default.Check,
+                            contentDescription = stringResource(R.string.selection_count, 1),
+                            tint = MaterialTheme.colorScheme.onPrimary,
+                            modifier = Modifier.size(16.dp)
+                        )
+                    }
+                }
+            }
+        }
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/components/NoteCardCompact.kt

@@ -0,0 +1,246 @@
+package dev.dettmer.simplenotes.ui.main.components
+
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.fadeIn
+import androidx.compose.animation.fadeOut
+import androidx.compose.animation.scaleIn
+import androidx.compose.animation.scaleOut
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.gestures.detectTapGestures
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.outlined.List
+import androidx.compose.material.icons.filled.Check
+import androidx.compose.material.icons.filled.Warning
+import androidx.compose.material.icons.outlined.CloudDone
+import androidx.compose.material.icons.outlined.CloudOff
+import androidx.compose.material.icons.outlined.CloudSync
+import androidx.compose.material.icons.outlined.Description
+import androidx.compose.material3.Card
+import androidx.compose.material3.CardDefaults
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.models.Note
+import dev.dettmer.simplenotes.models.NoteType
+import dev.dettmer.simplenotes.models.SyncStatus
+import dev.dettmer.simplenotes.utils.toReadableTime
+
+/**
+ * 🎨 v1.7.0: Compact Note Card for Grid Layout
+ * 
+ * COMPACT DESIGN für kleine Notizen:
+ * - Reduzierter Padding (12dp statt 16dp)
+ * - Kleinere Icons (24dp statt 32dp)
+ * - Kompakte Typography (titleSmall)
+ * - Max 3 Zeilen Preview
+ * - Optimiert für Grid-Ansicht
+ */
+@Composable
+fun NoteCardCompact(
+    note: Note,
+    showSyncStatus: Boolean,
+    isSelected: Boolean = false,
+    isSelectionMode: Boolean = false,
+    modifier: Modifier = Modifier,
+    onClick: () -> Unit,
+    onLongClick: () -> Unit
+) {
+    val context = LocalContext.current
+    
+    Card(
+        modifier = modifier
+            .fillMaxWidth()
+            .then(
+                if (isSelected) {
+                    Modifier.border(
+                        width = 2.dp,
+                        color = MaterialTheme.colorScheme.primary,
+                        shape = RoundedCornerShape(12.dp)
+                    )
+                } else Modifier
+            )
+            .pointerInput(note.id, isSelectionMode) {
+                detectTapGestures(
+                    onTap = { onClick() },
+                    onLongPress = { onLongClick() }
+                )
+            },
+        shape = RoundedCornerShape(12.dp),
+        elevation = CardDefaults.cardElevation(defaultElevation = 0.dp),
+        colors = CardDefaults.cardColors(
+            containerColor = if (isSelected) {
+                MaterialTheme.colorScheme.primaryContainer.copy(alpha = 0.3f)
+            } else {
+                MaterialTheme.colorScheme.surfaceContainerHigh
+            }
+        )
+    ) {
+        Box {
+            Column(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(12.dp)
+            ) {
+                // Header row - COMPACT
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    // Type icon - SMALLER
+                    Box(
+                        modifier = Modifier
+                            .size(24.dp)
+                            .background(
+                                MaterialTheme.colorScheme.primaryContainer,
+                                CircleShape
+                            ),
+                        contentAlignment = Alignment.Center
+                    ) {
+                        Icon(
+                            imageVector = if (note.noteType == NoteType.TEXT) 
+                                Icons.Outlined.Description 
+                            else 
+                                Icons.AutoMirrored.Outlined.List,
+                            contentDescription = null,
+                            tint = MaterialTheme.colorScheme.onPrimaryContainer,
+                            modifier = Modifier.size(12.dp)
+                        )
+                    }
+                    
+                    Spacer(modifier = Modifier.width(8.dp))
+                    
+                    // Title - COMPACT Typography
+                    Text(
+                        text = note.title.ifEmpty { stringResource(R.string.untitled) },
+                        style = MaterialTheme.typography.titleSmall,
+                        color = MaterialTheme.colorScheme.onSurface,
+                        maxLines = 1,
+                        overflow = TextOverflow.Ellipsis,
+                        modifier = Modifier.weight(1f)
+                    )
+                }
+                
+                Spacer(modifier = Modifier.height(6.dp))
+                
+                // Preview - MAX 3 ZEILEN
+                Text(
+                    text = when (note.noteType) {
+                        NoteType.TEXT -> note.content
+                        NoteType.CHECKLIST -> {
+                            note.checklistItems
+                                ?.joinToString("\n") { item ->
+                                    val prefix = if (item.isChecked) "✅" else "☐"
+                                    "$prefix ${item.text}"
+                                } ?: ""
+                        }
+                    },
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    maxLines = 3,
+                    overflow = TextOverflow.Ellipsis
+                )
+                
+                Spacer(modifier = Modifier.height(6.dp))
+                
+                // Bottom row - KOMPAKT
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    // Timestamp - SMALLER
+                    Text(
+                        text = note.updatedAt.toReadableTime(context),
+                        style = MaterialTheme.typography.labelSmall,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.7f),
+                        modifier = Modifier.weight(1f)
+                    )
+                    
+                    // Sync Status - KOMPAKT
+                    if (showSyncStatus) {
+                        Spacer(modifier = Modifier.width(4.dp))
+                        
+                        Icon(
+                            imageVector = when (note.syncStatus) {
+                                SyncStatus.SYNCED -> Icons.Outlined.CloudDone
+                                SyncStatus.PENDING -> Icons.Outlined.CloudSync
+                                SyncStatus.CONFLICT -> Icons.Default.Warning
+                                SyncStatus.LOCAL_ONLY -> Icons.Outlined.CloudOff
+                            },
+                            contentDescription = null,
+                            tint = when (note.syncStatus) {
+                                SyncStatus.SYNCED -> MaterialTheme.colorScheme.primary
+                                SyncStatus.CONFLICT -> MaterialTheme.colorScheme.error
+                                else -> MaterialTheme.colorScheme.outline
+                            },
+                            modifier = Modifier.size(14.dp)
+                        )
+                    }
+                }
+            }
+            
+            // Selection indicator checkbox (top-right)
+            androidx.compose.animation.AnimatedVisibility(
+                visible = isSelectionMode,
+                enter = fadeIn() + scaleIn(),
+                exit = fadeOut() + scaleOut(),
+                modifier = Modifier
+                    .align(Alignment.TopEnd)
+                    .padding(6.dp)
+            ) {
+                Box(
+                    modifier = Modifier
+                        .size(20.dp)
+                        .clip(CircleShape)
+                        .background(
+                            if (isSelected) {
+                                MaterialTheme.colorScheme.primary
+                            } else {
+                                MaterialTheme.colorScheme.surfaceContainerHighest
+                            }
+                        )
+                        .border(
+                            width = 2.dp,
+                            color = if (isSelected) {
+                                MaterialTheme.colorScheme.primary
+                            } else {
+                                MaterialTheme.colorScheme.outline
+                            },
+                            shape = CircleShape
+                        ),
+                    contentAlignment = Alignment.Center
+                ) {
+                    if (isSelected) {
+                        Icon(
+                            imageVector = Icons.Filled.Check,
+                            contentDescription = stringResource(R.string.selection_count, 1),
+                            tint = MaterialTheme.colorScheme.onPrimary,
+                            modifier = Modifier.size(12.dp)
+                        )
+                    }
+                }
+            }
+        }
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/components/NoteCardGrid.kt

@@ -0,0 +1,250 @@
+package dev.dettmer.simplenotes.ui.main.components
+
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.fadeIn
+import androidx.compose.animation.fadeOut
+import androidx.compose.animation.scaleIn
+import androidx.compose.animation.scaleOut
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.gestures.detectTapGestures
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.outlined.List
+import androidx.compose.material.icons.filled.Check
+import androidx.compose.material.icons.filled.Warning
+import androidx.compose.material.icons.outlined.CloudDone
+import androidx.compose.material.icons.outlined.CloudOff
+import androidx.compose.material.icons.outlined.CloudSync
+import androidx.compose.material.icons.outlined.Description
+import androidx.compose.material3.Card
+import androidx.compose.material3.CardDefaults
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.models.Note
+import dev.dettmer.simplenotes.models.NoteSize
+import dev.dettmer.simplenotes.models.NoteType
+import dev.dettmer.simplenotes.models.SyncStatus
+import dev.dettmer.simplenotes.models.getSize
+import dev.dettmer.simplenotes.utils.toReadableTime
+
+/**
+ * 🎨 v1.7.0: Unified Note Card for Grid Layout
+ * 
+ * Einheitliche Card für ALLE Notizen im Grid:
+ * - Dynamische maxLines basierend auf NoteSize
+ * - LARGE notes: 6 Zeilen Preview
+ * - SMALL notes: 3 Zeilen Preview
+ * - Kein externes Padding - Grid steuert Abstände
+ * - Optimiert für Pinterest-style dynamisches Layout
+ */
+@Composable
+fun NoteCardGrid(
+    note: Note,
+    showSyncStatus: Boolean,
+    isSelected: Boolean = false,
+    isSelectionMode: Boolean = false,
+    onClick: () -> Unit,
+    onLongClick: () -> Unit
+) {
+    val context = LocalContext.current
+    val noteSize = note.getSize()
+    
+    // Dynamische maxLines basierend auf Größe
+    val previewMaxLines = if (noteSize == NoteSize.LARGE) 6 else 3
+    
+    Card(
+        modifier = Modifier
+            .fillMaxWidth()
+            // Kein externes Padding - Grid steuert alles
+            .then(
+                if (isSelected) {
+                    Modifier.border(
+                        width = 2.dp,
+                        color = MaterialTheme.colorScheme.primary,
+                        shape = RoundedCornerShape(12.dp)
+                    )
+                } else Modifier
+            )
+            .pointerInput(note.id, isSelectionMode) {
+                detectTapGestures(
+                    onTap = { onClick() },
+                    onLongPress = { onLongClick() }
+                )
+            },
+        shape = RoundedCornerShape(12.dp),
+        elevation = CardDefaults.cardElevation(defaultElevation = 0.dp),
+        colors = CardDefaults.cardColors(
+            containerColor = if (isSelected) {
+                MaterialTheme.colorScheme.primaryContainer.copy(alpha = 0.3f)
+            } else {
+                MaterialTheme.colorScheme.surfaceContainerHigh
+            }
+        )
+    ) {
+        Box {
+            Column(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(12.dp)  // Einheitliches internes Padding
+            ) {
+                // Header row
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    // Type icon
+                    Box(
+                        modifier = Modifier
+                            .size(24.dp)
+                            .background(
+                                MaterialTheme.colorScheme.primaryContainer,
+                                CircleShape
+                            ),
+                        contentAlignment = Alignment.Center
+                    ) {
+                        Icon(
+                            imageVector = if (note.noteType == NoteType.TEXT) 
+                                Icons.Outlined.Description 
+                            else 
+                                Icons.AutoMirrored.Outlined.List,
+                            contentDescription = null,
+                            tint = MaterialTheme.colorScheme.onPrimaryContainer,
+                            modifier = Modifier.size(12.dp)
+                        )
+                    }
+                    
+                    Spacer(modifier = Modifier.width(8.dp))
+                    
+                    // Title
+                    Text(
+                        text = note.title.ifEmpty { stringResource(R.string.untitled) },
+                        style = MaterialTheme.typography.titleSmall,
+                        color = MaterialTheme.colorScheme.onSurface,
+                        maxLines = 2,
+                        overflow = TextOverflow.Ellipsis,
+                        modifier = Modifier.weight(1f)
+                    )
+                }
+                
+                Spacer(modifier = Modifier.height(6.dp))
+                
+                // Preview - Dynamische Zeilen basierend auf NoteSize
+                Text(
+                    text = when (note.noteType) {
+                        NoteType.TEXT -> note.content
+                        NoteType.CHECKLIST -> {
+                            note.checklistItems
+                                ?.joinToString("\n") { item ->
+                                    val prefix = if (item.isChecked) "✅" else "☐"
+                                    "$prefix ${item.text}"
+                                } ?: ""
+                        }
+                    },
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    maxLines = previewMaxLines,  // 🎯 Dynamisch: LARGE=6, SMALL=3
+                    overflow = TextOverflow.Ellipsis
+                )
+                
+                Spacer(modifier = Modifier.height(6.dp))
+                
+                // Footer
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    Text(
+                        text = note.updatedAt.toReadableTime(context),
+                        style = MaterialTheme.typography.labelSmall,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.7f),
+                        modifier = Modifier.weight(1f)
+                    )
+                    
+                    if (showSyncStatus) {
+                        Spacer(modifier = Modifier.width(4.dp))
+                        
+                        Icon(
+                            imageVector = when (note.syncStatus) {
+                                SyncStatus.SYNCED -> Icons.Outlined.CloudDone
+                                SyncStatus.PENDING -> Icons.Outlined.CloudSync
+                                SyncStatus.CONFLICT -> Icons.Default.Warning
+                                SyncStatus.LOCAL_ONLY -> Icons.Outlined.CloudOff
+                            },
+                            contentDescription = null,
+                            tint = when (note.syncStatus) {
+                                SyncStatus.SYNCED -> MaterialTheme.colorScheme.primary
+                                SyncStatus.CONFLICT -> MaterialTheme.colorScheme.error
+                                else -> MaterialTheme.colorScheme.outline
+                            },
+                            modifier = Modifier.size(14.dp)
+                        )
+                    }
+                }
+            }
+            
+            // Selection indicator checkbox (top-right)
+            androidx.compose.animation.AnimatedVisibility(
+                visible = isSelectionMode,
+                enter = fadeIn() + scaleIn(),
+                exit = fadeOut() + scaleOut(),
+                modifier = Modifier
+                    .align(Alignment.TopEnd)
+                    .padding(6.dp)
+            ) {
+                Box(
+                    modifier = Modifier
+                        .size(20.dp)
+                        .clip(CircleShape)
+                        .background(
+                            if (isSelected) {
+                                MaterialTheme.colorScheme.primary
+                            } else {
+                                MaterialTheme.colorScheme.surfaceContainerHighest
+                            }
+                        )
+                        .border(
+                            width = 2.dp,
+                            color = if (isSelected) {
+                                MaterialTheme.colorScheme.primary
+                            } else {
+                                MaterialTheme.colorScheme.outline
+                            },
+                            shape = CircleShape
+                        ),
+                    contentAlignment = Alignment.Center
+                ) {
+                    if (isSelected) {
+                        Icon(
+                            imageVector = Icons.Filled.Check,
+                            contentDescription = stringResource(R.string.selection_count, 1),
+                            tint = MaterialTheme.colorScheme.onPrimary,
+                            modifier = Modifier.size(12.dp)
+                        )
+                    }
+                }
+            }
+        }
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/components/NoteTypeFAB.kt

@@ -0,0 +1,85 @@
+package dev.dettmer.simplenotes.ui.main.components
+
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.outlined.List
+import androidx.compose.material.icons.filled.Add
+import androidx.compose.material.icons.outlined.Description
+import androidx.compose.material3.DropdownMenu
+import androidx.compose.material3.DropdownMenuItem
+import androidx.compose.material3.FloatingActionButton
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.models.NoteType
+
+/**
+ * FAB with dropdown menu for note type selection
+ * v1.5.0: PERFORMANCE FIX - No Box wrapper for proper elevation
+ * 
+ * Uses consistent icons with NoteCard:
+ * - TEXT: Description (document icon)
+ * - CHECKLIST: List (bullet list icon)
+ */
+@Composable
+fun NoteTypeFAB(
+    modifier: Modifier = Modifier,
+    onCreateNote: (NoteType) -> Unit
+) {
+    var expanded by remember { mutableStateOf(false) }
+    
+    // FAB directly without Box wrapper - elevation works correctly
+    FloatingActionButton(
+        onClick = { expanded = true },
+        modifier = modifier,
+        containerColor = MaterialTheme.colorScheme.primary,
+        contentColor = MaterialTheme.colorScheme.onPrimary
+    ) {
+        Icon(
+            imageVector = Icons.Default.Add,
+            contentDescription = stringResource(R.string.fab_new_note)
+        )
+        
+        // Dropdown inside FAB - renders as popup overlay
+        DropdownMenu(
+            expanded = expanded,
+            onDismissRequest = { expanded = false }
+        ) {
+            DropdownMenuItem(
+                text = { Text(stringResource(R.string.fab_text_note)) },
+                leadingIcon = {
+                    Icon(
+                        imageVector = Icons.Outlined.Description,
+                        contentDescription = null,
+                        tint = MaterialTheme.colorScheme.onSurface
+                    )
+                },
+                onClick = {
+                    expanded = false
+                    onCreateNote(NoteType.TEXT)
+                }
+            )
+            DropdownMenuItem(
+                text = { Text(stringResource(R.string.fab_checklist)) },
+                leadingIcon = {
+                    Icon(
+                        imageVector = Icons.AutoMirrored.Outlined.List,
+                        contentDescription = null,
+                        tint = MaterialTheme.colorScheme.onSurface
+                    )
+                },
+                onClick = {
+                    expanded = false
+                    onCreateNote(NoteType.CHECKLIST)
+                }
+            )
+        }
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/components/NotesList.kt

@@ -0,0 +1,68 @@
+package dev.dettmer.simplenotes.ui.main.components
+
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.LazyListState
+import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.lazy.rememberLazyListState
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.models.Note
+
+/**
+ * Notes list - v1.5.0 with Multi-Select Support
+ * 
+ * ULTRA SIMPLE + SELECTION:
+ * - NO remember() anywhere
+ * - NO caching tricks
+ * - Selection state passed through as parameters
+ * - Tap behavior changes based on selection mode
+ */
+@Composable
+fun NotesList(
+    notes: List<Note>,
+    showSyncStatus: Boolean,
+    selectedNotes: Set<String> = emptySet(),
+    isSelectionMode: Boolean = false,
+    modifier: Modifier = Modifier,
+    listState: LazyListState = rememberLazyListState(),
+    onNoteClick: (Note) -> Unit,
+    onNoteLongPress: (Note) -> Unit,
+    onNoteSelectionToggle: (Note) -> Unit = {}
+) {
+    LazyColumn(
+        state = listState,
+        modifier = modifier.fillMaxSize(),
+        contentPadding = PaddingValues(top = 8.dp, bottom = 88.dp)
+    ) {
+        items(
+            items = notes,
+            key = { it.id },
+            contentType = { "NoteCard" }
+        ) { note ->
+            val isSelected = note.id in selectedNotes
+            
+            NoteCard(
+                note = note,
+                showSyncStatus = showSyncStatus,
+                isSelected = isSelected,
+                isSelectionMode = isSelectionMode,
+                // 🎨 v1.7.0: Padding hier in Liste (nicht in Card selbst)
+                modifier = Modifier.padding(horizontal = 16.dp, vertical = 4.dp),
+                onClick = {
+                    if (isSelectionMode) {
+                        // In selection mode, tap toggles selection
+                        onNoteSelectionToggle(note)
+                    } else {
+                        // Normal mode, open note
+                        onNoteClick(note)
+                    }
+                },
+                onLongClick = { onNoteLongPress(note) }
+            )
+        }
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/components/NotesStaggeredGrid.kt

@@ -0,0 +1,70 @@
+package dev.dettmer.simplenotes.ui.main.components
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.lazy.staggeredgrid.LazyVerticalStaggeredGrid
+import androidx.compose.foundation.lazy.staggeredgrid.LazyStaggeredGridState
+import androidx.compose.foundation.lazy.staggeredgrid.StaggeredGridCells
+import androidx.compose.foundation.lazy.staggeredgrid.items
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.models.Note
+import dev.dettmer.simplenotes.utils.Constants
+
+/**
+ * 🎨 v1.7.0: Staggered Grid Layout - OPTIMIERT
+ * 
+ * Pinterest-style Grid:
+ * - ALLE Items als SingleLane (halbe Breite)
+ * - Dynamische Höhe basierend auf NoteSize (LARGE=6 Zeilen, SMALL=3 Zeilen)
+ * - Keine Lücken mehr durch FullLine-Items
+ * - Selection mode support
+ * - Efficient LazyVerticalStaggeredGrid
+ */
+@Composable
+fun NotesStaggeredGrid(
+    notes: List<Note>,
+    gridState: LazyStaggeredGridState,
+    showSyncStatus: Boolean,
+    selectedNoteIds: Set<String>,
+    isSelectionMode: Boolean,
+    modifier: Modifier = Modifier,
+    onNoteClick: (Note) -> Unit,
+    onNoteLongClick: (Note) -> Unit
+) {
+    
+    LazyVerticalStaggeredGrid(
+        columns = StaggeredGridCells.Fixed(Constants.GRID_COLUMNS),
+        modifier = modifier.fillMaxSize(),
+        state = gridState,
+        // 🎨 v1.7.0: Konsistente Abstände - 16dp horizontal wie Liste, mehr Platz für FAB
+        contentPadding = PaddingValues(
+            start = 16.dp,       // Wie Liste, war 8dp
+            end = 16.dp,
+            top = 8.dp,
+            bottom = 80.dp       // Mehr Platz für FAB, war 16dp
+        ),
+        horizontalArrangement = Arrangement.spacedBy(12.dp),  // War 8dp
+        verticalItemSpacing = 12.dp                            // War Constants.GRID_SPACING_DP (8dp)
+    ) {
+        items(
+            items = notes,
+            key = { it.id }
+            // 🎨 v1.7.0: KEIN span mehr - alle Items sind SingleLane (halbe Breite)
+        ) { note ->
+            val isSelected = selectedNoteIds.contains(note.id)
+            
+            // 🎉 Einheitliche Card für alle Größen - dynamische maxLines intern
+            NoteCardGrid(
+                note = note,
+                showSyncStatus = showSyncStatus,
+                isSelected = isSelected,
+                isSelectionMode = isSelectionMode,
+                onClick = { onNoteClick(note) },
+                onLongClick = { onNoteLongClick(note) }
+            )
+        }
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/main/components/SyncStatusBanner.kt

@@ -0,0 +1,77 @@
+package dev.dettmer.simplenotes.ui.main.components
+
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.expandVertically
+import androidx.compose.animation.shrinkVertically
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.sync.SyncStateManager
+
+/**
+ * Sync status banner shown below the toolbar during sync
+ * v1.5.0: Jetpack Compose MainActivity Redesign
+ * v1.5.0: SYNCING_SILENT ignorieren - Banner nur bei manuellen Syncs oder Fehlern anzeigen
+ */
+@Composable
+fun SyncStatusBanner(
+    syncState: SyncStateManager.SyncState,
+    message: String?,
+    modifier: Modifier = Modifier
+) {
+    // v1.5.0: Banner nicht anzeigen bei IDLE oder SYNCING_SILENT (Auto-Sync im Hintergrund)
+    // Fehler werden trotzdem angezeigt (ERROR state nach Silent-Sync wechselt zu ERROR, nicht SYNCING_SILENT)
+    val isVisible = syncState != SyncStateManager.SyncState.IDLE 
+                    && syncState != SyncStateManager.SyncState.SYNCING_SILENT
+    
+    AnimatedVisibility(
+        visible = isVisible,
+        enter = expandVertically(),
+        exit = shrinkVertically(),
+        modifier = modifier
+    ) {
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .background(MaterialTheme.colorScheme.primaryContainer)
+                .padding(horizontal = 16.dp, vertical = 8.dp),
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            if (syncState == SyncStateManager.SyncState.SYNCING) {
+                CircularProgressIndicator(
+                    modifier = Modifier.size(24.dp),
+                    strokeWidth = 3.dp,
+                    color = MaterialTheme.colorScheme.onPrimaryContainer
+                )
+            }
+            
+            Spacer(modifier = Modifier.width(12.dp))
+            
+            Text(
+                text = when (syncState) {
+                    SyncStateManager.SyncState.SYNCING -> stringResource(R.string.sync_status_syncing)
+                    SyncStateManager.SyncState.SYNCING_SILENT -> "" // v1.5.0: Wird nicht angezeigt (isVisible = false)
+                    SyncStateManager.SyncState.COMPLETED -> message ?: stringResource(R.string.sync_status_completed)
+                    SyncStateManager.SyncState.ERROR -> message ?: stringResource(R.string.sync_status_error)
+                    SyncStateManager.SyncState.IDLE -> ""
+                },
+                style = MaterialTheme.typography.bodyMedium,
+                color = MaterialTheme.colorScheme.onPrimaryContainer,
+                modifier = Modifier.weight(1f)
+            )
+        }
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/ComposeSettingsActivity.kt

@@ -0,0 +1,186 @@
+package dev.dettmer.simplenotes.ui.settings
+
+import android.content.Context
+import android.content.Intent
+import android.net.Uri
+import android.os.Bundle
+import android.os.PowerManager
+import android.provider.Settings
+import android.widget.Toast
+import androidx.activity.OnBackPressedCallback
+import androidx.activity.compose.setContent
+import androidx.activity.enableEdgeToEdge
+import androidx.activity.viewModels
+import androidx.appcompat.app.AlertDialog
+import androidx.appcompat.app.AppCompatActivity
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.ui.platform.LocalContext
+import androidx.navigation.compose.rememberNavController
+import com.google.android.material.color.DynamicColors
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.SimpleNotesApplication
+import dev.dettmer.simplenotes.ui.theme.SimpleNotesTheme
+import dev.dettmer.simplenotes.utils.Logger
+import androidx.lifecycle.lifecycleScope
+import kotlinx.coroutines.launch
+
+/**
+ * Settings Activity with Jetpack Compose UI
+ * v1.5.0: Complete Settings Redesign with grouped screens
+ * 
+ * Replaces the old 1147-line SettingsActivity.kt with a modern
+ * Compose-based implementation featuring:
+ * - 6 logical settings groups as separate screens
+ * - Material 3 Design with Dynamic Colors (Material You)
+ * - Navigation with back button in each screen
+ * - Clean separation of concerns with SettingsViewModel
+ */
+class ComposeSettingsActivity : AppCompatActivity() {
+    
+    companion object {
+        private const val TAG = "ComposeSettingsActivity"
+    }
+    
+    private val viewModel: SettingsViewModel by viewModels()
+    
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        
+        // Apply Dynamic Colors for Material You (Android 12+)
+        DynamicColors.applyToActivityIfAvailable(this)
+        
+        // Enable edge-to-edge display
+        enableEdgeToEdge()
+        
+        // Handle back button with slide animation
+        onBackPressedDispatcher.addCallback(this, object : OnBackPressedCallback(true) {
+            override fun handleOnBackPressed() {
+                setResult(RESULT_OK)
+                finish()
+                @Suppress("DEPRECATION")
+                overridePendingTransition(
+                    dev.dettmer.simplenotes.R.anim.slide_in_left,
+                    dev.dettmer.simplenotes.R.anim.slide_out_right
+                )
+            }
+        })
+        
+        // Collect events from ViewModel (for Activity-level actions)
+        collectViewModelEvents()
+        
+        setContent {
+            SimpleNotesTheme {
+                val navController = rememberNavController()
+                val context = LocalContext.current
+                
+                // Toast handling from ViewModel
+                LaunchedEffect(Unit) {
+                    viewModel.showToast.collect { message ->
+                        Toast.makeText(context, message, Toast.LENGTH_SHORT).show()
+                    }
+                }
+                
+                SettingsNavHost(
+                    navController = navController,
+                    viewModel = viewModel,
+                    onFinish = {
+                        setResult(RESULT_OK)
+                        finish()
+                        @Suppress("DEPRECATION")
+                        overridePendingTransition(
+                            dev.dettmer.simplenotes.R.anim.slide_in_left,
+                            dev.dettmer.simplenotes.R.anim.slide_out_right
+                        )
+                    }
+                )
+            }
+        }
+    }
+    
+    /**
+     * Collect events from ViewModel for Activity-level actions
+     * v1.5.0: Ported from old SettingsActivity
+     */
+    private fun collectViewModelEvents() {
+        lifecycleScope.launch {
+            viewModel.events.collect { event ->
+                when (event) {
+                    is SettingsViewModel.SettingsEvent.RequestBatteryOptimization -> {
+                        checkBatteryOptimization()
+                    }
+                    is SettingsViewModel.SettingsEvent.RestartNetworkMonitor -> {
+                        restartNetworkMonitor()
+                    }
+                }
+            }
+        }
+    }
+    
+    /**
+     * Check if battery optimization is disabled for this app
+     * v1.5.0: Ported from old SettingsActivity
+     */
+    private fun checkBatteryOptimization() {
+        val powerManager = getSystemService(Context.POWER_SERVICE) as PowerManager
+        
+        if (!powerManager.isIgnoringBatteryOptimizations(packageName)) {
+            showBatteryOptimizationDialog()
+        }
+    }
+    
+    /**
+     * Show dialog asking user to disable battery optimization
+     * v1.5.0: Ported from old SettingsActivity
+     */
+    private fun showBatteryOptimizationDialog() {
+        AlertDialog.Builder(this)
+            .setTitle(getString(R.string.battery_optimization_dialog_title))
+            .setMessage(getString(R.string.battery_optimization_dialog_full_message))
+            .setPositiveButton(getString(R.string.battery_optimization_open_settings)) { _, _ ->
+                openBatteryOptimizationSettings()
+            }
+            .setNegativeButton(getString(R.string.battery_optimization_later)) { dialog, _ ->
+                dialog.dismiss()
+            }
+            .setCancelable(false)
+            .show()
+    }
+    
+    /**
+     * Open system battery optimization settings
+     * v1.5.0: Ported from old SettingsActivity
+     */
+    private fun openBatteryOptimizationSettings() {
+        try {
+            val intent = Intent(Settings.ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS)
+            intent.data = Uri.parse("package:$packageName")
+            startActivity(intent)
+        } catch (e: Exception) {
+            Logger.w(TAG, "Failed to open battery optimization settings: ${e.message}")
+            // Fallback: Open general battery settings
+            try {
+                val intent = Intent(Settings.ACTION_IGNORE_BATTERY_OPTIMIZATION_SETTINGS)
+                startActivity(intent)
+            } catch (e2: Exception) {
+                Logger.w(TAG, "Failed to open fallback battery settings: ${e2.message}")
+                Toast.makeText(this, "Bitte Akku-Optimierung manuell deaktivieren", Toast.LENGTH_LONG).show()
+            }
+        }
+    }
+    
+    /**
+     * Restart the network monitor after sync settings change
+     * v1.5.0: Ported from old SettingsActivity
+     */
+    private fun restartNetworkMonitor() {
+        try {
+            val app = application as SimpleNotesApplication
+            Logger.d(TAG, "🔄 Restarting NetworkMonitor with new settings")
+            app.networkMonitor.stopMonitoring()
+            app.networkMonitor.startMonitoring()
+            Logger.d(TAG, "✅ NetworkMonitor restarted successfully")
+        } catch (e: Exception) {
+            Logger.e(TAG, "❌ Failed to restart NetworkMonitor: ${e.message}")
+        }
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/SettingsNavigation.kt

@@ -0,0 +1,108 @@
+package dev.dettmer.simplenotes.ui.settings
+
+import androidx.compose.runtime.Composable
+import androidx.navigation.NavHostController
+import androidx.navigation.compose.NavHost
+import androidx.navigation.compose.composable
+import dev.dettmer.simplenotes.ui.settings.screens.AboutScreen
+import dev.dettmer.simplenotes.ui.settings.screens.BackupSettingsScreen
+import dev.dettmer.simplenotes.ui.settings.screens.DebugSettingsScreen
+import dev.dettmer.simplenotes.ui.settings.screens.DisplaySettingsScreen
+import dev.dettmer.simplenotes.ui.settings.screens.LanguageSettingsScreen
+import dev.dettmer.simplenotes.ui.settings.screens.MarkdownSettingsScreen
+import dev.dettmer.simplenotes.ui.settings.screens.ServerSettingsScreen
+import dev.dettmer.simplenotes.ui.settings.screens.SettingsMainScreen
+import dev.dettmer.simplenotes.ui.settings.screens.SyncSettingsScreen
+
+/**
+ * Settings navigation host with all routes
+ * v1.5.0: Jetpack Compose Settings Redesign
+ */
+@Composable
+fun SettingsNavHost(
+    navController: NavHostController,
+    viewModel: SettingsViewModel,
+    onFinish: () -> Unit
+) {
+    NavHost(
+        navController = navController,
+        startDestination = SettingsRoute.Main.route
+    ) {
+        // Main Settings Overview
+        composable(SettingsRoute.Main.route) {
+            SettingsMainScreen(
+                viewModel = viewModel,
+                onNavigate = { route -> navController.navigate(route.route) },
+                onBack = onFinish
+            )
+        }
+        
+        // Language Settings
+        composable(SettingsRoute.Language.route) {
+            LanguageSettingsScreen(
+                onBack = { navController.popBackStack() }
+            )
+        }
+        
+        // Server Settings
+        composable(SettingsRoute.Server.route) {
+            ServerSettingsScreen(
+                viewModel = viewModel,
+                onBack = { navController.popBackStack() }
+            )
+        }
+        
+        // Sync Settings
+        composable(SettingsRoute.Sync.route) {
+            SyncSettingsScreen(
+                viewModel = viewModel,
+                onBack = { navController.popBackStack() },
+                onNavigateToServerSettings = {
+                    navController.navigate(SettingsRoute.Server.route) {
+                        // Avoid multiple copies of server settings in back stack
+                        launchSingleTop = true
+                    }
+                }
+            )
+        }
+        
+        // Markdown Settings
+        composable(SettingsRoute.Markdown.route) {
+            MarkdownSettingsScreen(
+                viewModel = viewModel,
+                onBack = { navController.popBackStack() }
+            )
+        }
+        
+        // Backup Settings
+        composable(SettingsRoute.Backup.route) {
+            BackupSettingsScreen(
+                viewModel = viewModel,
+                onBack = { navController.popBackStack() }
+            )
+        }
+        
+        // About Screen
+        composable(SettingsRoute.About.route) {
+            AboutScreen(
+                onBack = { navController.popBackStack() }
+            )
+        }
+        
+        // Debug Settings
+        composable(SettingsRoute.Debug.route) {
+            DebugSettingsScreen(
+                viewModel = viewModel,
+                onBack = { navController.popBackStack() }
+            )
+        }
+        
+        // 🎨 v1.7.0: Display Settings
+        composable(SettingsRoute.Display.route) {
+            DisplaySettingsScreen(
+                viewModel = viewModel,
+                onBack = { navController.popBackStack() }
+            )
+        }
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/SettingsRoute.kt

@@ -0,0 +1,17 @@
+package dev.dettmer.simplenotes.ui.settings
+
+/**
+ * Navigation routes for Settings screens
+ * v1.5.0: Jetpack Compose Settings Redesign
+ */
+sealed class SettingsRoute(val route: String) {
+    data object Main : SettingsRoute("settings_main")
+    data object Language : SettingsRoute("settings_language")
+    data object Server : SettingsRoute("settings_server")
+    data object Sync : SettingsRoute("settings_sync")
+    data object Markdown : SettingsRoute("settings_markdown")
+    data object Backup : SettingsRoute("settings_backup")
+    data object About : SettingsRoute("settings_about")
+    data object Debug : SettingsRoute("settings_debug")
+    data object Display : SettingsRoute("settings_display")  // 🎨 v1.7.0
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/SettingsViewModel.kt

@@ -0,0 +1,868 @@
+package dev.dettmer.simplenotes.ui.settings
+
+import android.app.Application
+import android.content.Context
+import android.net.Uri
+import android.util.Log
+import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.viewModelScope
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.backup.BackupManager
+import dev.dettmer.simplenotes.backup.RestoreMode
+import dev.dettmer.simplenotes.storage.NotesStorage
+import dev.dettmer.simplenotes.sync.WebDavSyncService
+import dev.dettmer.simplenotes.utils.Constants
+import dev.dettmer.simplenotes.utils.Logger
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.SharedFlow
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asSharedFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import java.net.HttpURLConnection
+import java.net.URL
+
+/**
+ * ViewModel for Settings screens
+ * v1.5.0: Jetpack Compose Settings Redesign
+ * 
+ * Manages all settings state and actions across the Settings navigation graph.
+ */
+@Suppress("TooManyFunctions") // v1.7.0: 35 Funktionen durch viele kleine Setter (setTrigger*, set*)
+class SettingsViewModel(application: Application) : AndroidViewModel(application) {
+    
+    companion object {
+        private const val TAG = "SettingsViewModel"
+        private const val CONNECTION_TIMEOUT_MS = 3000
+    }
+    
+    private val prefs = application.getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE)
+    val backupManager = BackupManager(application)
+    private val notesStorage = NotesStorage(application) // v1.7.0: For server change detection
+    
+    // 🔧 v1.7.0 Hotfix: Track last confirmed server URL for change detection
+    // This prevents false-positive "server changed" toasts during text input
+    private var confirmedServerUrl: String = prefs.getString(Constants.KEY_SERVER_URL, "") ?: ""
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Server Settings State
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    // v1.5.0 Fix: Initialize URL with protocol prefix if empty
+    private val storedUrl = prefs.getString(Constants.KEY_SERVER_URL, "") ?: ""
+    
+    // 🌟 v1.6.0: Separate host from prefix for better UX
+    // isHttps determines the prefix, serverHost is the editable part
+    private val _isHttps = MutableStateFlow(storedUrl.startsWith("https://"))
+    val isHttps: StateFlow<Boolean> = _isHttps.asStateFlow()
+    
+    // Extract host part (everything after http:// or https://)
+    private fun extractHostFromUrl(url: String): String {
+        return when {
+            url.startsWith("https://") -> url.removePrefix("https://")
+            url.startsWith("http://") -> url.removePrefix("http://")
+            else -> url
+        }
+    }
+    
+    // 🌟 v1.6.0: Only the host part is editable (without protocol prefix)
+    private val _serverHost = MutableStateFlow(extractHostFromUrl(storedUrl))
+    val serverHost: StateFlow<String> = _serverHost.asStateFlow()
+    
+    // 🌟 v1.6.0: Full URL for display purposes (computed from prefix + host)
+    val serverUrl: StateFlow<String> = combine(_isHttps, _serverHost) { https, host ->
+        val prefix = if (https) "https://" else "http://"
+        if (host.isEmpty()) "" else prefix + host
+    }.stateIn(viewModelScope, SharingStarted.Eagerly, storedUrl)
+    
+    private val _username = MutableStateFlow(prefs.getString(Constants.KEY_USERNAME, "") ?: "")
+    val username: StateFlow<String> = _username.asStateFlow()
+    
+    private val _password = MutableStateFlow(prefs.getString(Constants.KEY_PASSWORD, "") ?: "")
+    val password: StateFlow<String> = _password.asStateFlow()
+    
+    private val _serverStatus = MutableStateFlow<ServerStatus>(ServerStatus.Unknown)
+    val serverStatus: StateFlow<ServerStatus> = _serverStatus.asStateFlow()
+    
+    // 🌟 v1.6.0: Offline Mode Toggle
+    // Default: true for new users (no server), false for existing users (has server config)
+    private val _offlineMode = MutableStateFlow(
+        if (prefs.contains(Constants.KEY_OFFLINE_MODE)) {
+            prefs.getBoolean(Constants.KEY_OFFLINE_MODE, true)
+        } else {
+            // Migration: auto-detect based on existing server config
+            !hasExistingServerConfig()
+        }
+    )
+    val offlineMode: StateFlow<Boolean> = _offlineMode.asStateFlow()
+    
+    private fun hasExistingServerConfig(): Boolean {
+        val serverUrl = prefs.getString(Constants.KEY_SERVER_URL, null)
+        return !serverUrl.isNullOrEmpty() && 
+               serverUrl != "http://" && 
+               serverUrl != "https://"
+    }
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Events (for Activity-level actions like dialogs, intents)
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    private val _events = MutableSharedFlow<SettingsEvent>()
+    val events: SharedFlow<SettingsEvent> = _events.asSharedFlow()
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Markdown Export Progress State
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    private val _markdownExportProgress = MutableStateFlow<MarkdownExportProgress?>(null)
+    val markdownExportProgress: StateFlow<MarkdownExportProgress?> = _markdownExportProgress.asStateFlow()
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Sync Settings State
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    private val _autoSyncEnabled = MutableStateFlow(prefs.getBoolean(Constants.KEY_AUTO_SYNC, false))
+    val autoSyncEnabled: StateFlow<Boolean> = _autoSyncEnabled.asStateFlow()
+    
+    private val _syncInterval = MutableStateFlow(
+        prefs.getLong(Constants.PREF_SYNC_INTERVAL_MINUTES, Constants.DEFAULT_SYNC_INTERVAL_MINUTES)
+    )
+    val syncInterval: StateFlow<Long> = _syncInterval.asStateFlow()
+    
+    // 🌟 v1.6.0: Configurable Sync Triggers
+    private val _triggerOnSave = MutableStateFlow(
+        prefs.getBoolean(Constants.KEY_SYNC_TRIGGER_ON_SAVE, Constants.DEFAULT_TRIGGER_ON_SAVE)
+    )
+    val triggerOnSave: StateFlow<Boolean> = _triggerOnSave.asStateFlow()
+    
+    private val _triggerOnResume = MutableStateFlow(
+        prefs.getBoolean(Constants.KEY_SYNC_TRIGGER_ON_RESUME, Constants.DEFAULT_TRIGGER_ON_RESUME)
+    )
+    val triggerOnResume: StateFlow<Boolean> = _triggerOnResume.asStateFlow()
+    
+    private val _triggerWifiConnect = MutableStateFlow(
+        prefs.getBoolean(Constants.KEY_SYNC_TRIGGER_WIFI_CONNECT, Constants.DEFAULT_TRIGGER_WIFI_CONNECT)
+    )
+    val triggerWifiConnect: StateFlow<Boolean> = _triggerWifiConnect.asStateFlow()
+    
+    private val _triggerPeriodic = MutableStateFlow(
+        prefs.getBoolean(Constants.KEY_SYNC_TRIGGER_PERIODIC, Constants.DEFAULT_TRIGGER_PERIODIC)
+    )
+    val triggerPeriodic: StateFlow<Boolean> = _triggerPeriodic.asStateFlow()
+    
+    private val _triggerBoot = MutableStateFlow(
+        prefs.getBoolean(Constants.KEY_SYNC_TRIGGER_BOOT, Constants.DEFAULT_TRIGGER_BOOT)
+    )
+    val triggerBoot: StateFlow<Boolean> = _triggerBoot.asStateFlow()
+    
+    // 🎉 v1.7.0: WiFi-Only Sync Toggle
+    private val _wifiOnlySync = MutableStateFlow(
+        prefs.getBoolean(Constants.KEY_WIFI_ONLY_SYNC, Constants.DEFAULT_WIFI_ONLY_SYNC)
+    )
+    val wifiOnlySync: StateFlow<Boolean> = _wifiOnlySync.asStateFlow()
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Markdown Settings State
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    private val _markdownAutoSync = MutableStateFlow(
+        prefs.getBoolean(Constants.KEY_MARKDOWN_EXPORT, false) &&
+        prefs.getBoolean(Constants.KEY_MARKDOWN_AUTO_IMPORT, false)
+    )
+    val markdownAutoSync: StateFlow<Boolean> = _markdownAutoSync.asStateFlow()
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Debug Settings State
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    private val _fileLoggingEnabled = MutableStateFlow(
+        prefs.getBoolean(Constants.KEY_FILE_LOGGING_ENABLED, false)
+    )
+    val fileLoggingEnabled: StateFlow<Boolean> = _fileLoggingEnabled.asStateFlow()
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // 🎨 v1.7.0: Display Settings State
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    private val _displayMode = MutableStateFlow(
+        prefs.getString(Constants.KEY_DISPLAY_MODE, Constants.DEFAULT_DISPLAY_MODE) ?: Constants.DEFAULT_DISPLAY_MODE
+    )
+    val displayMode: StateFlow<String> = _displayMode.asStateFlow()
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // UI State
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    private val _isSyncing = MutableStateFlow(false)
+    val isSyncing: StateFlow<Boolean> = _isSyncing.asStateFlow()
+    
+    private val _isBackupInProgress = MutableStateFlow(false)
+    val isBackupInProgress: StateFlow<Boolean> = _isBackupInProgress.asStateFlow()
+    
+    private val _showToast = MutableSharedFlow<String>()
+    val showToast: SharedFlow<String> = _showToast.asSharedFlow()
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Server Settings Actions
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    /**
+     * v1.6.0: Set offline mode on/off
+     * When enabled, all network features are disabled
+     */
+    fun setOfflineMode(enabled: Boolean) {
+        _offlineMode.value = enabled
+        prefs.edit().putBoolean(Constants.KEY_OFFLINE_MODE, enabled).apply()
+        
+        if (enabled) {
+            _serverStatus.value = ServerStatus.OfflineMode
+        } else {
+            // Re-check server status when disabling offline mode
+            checkServerStatus()
+        }
+    }
+    
+    fun updateServerUrl(url: String) {
+        // 🌟 v1.6.0: Deprecated - use updateServerHost instead
+        // This function is kept for compatibility but now delegates to updateServerHost
+        val host = extractHostFromUrl(url)
+        updateServerHost(host)
+    }
+    
+    /**
+     * 🌟 v1.6.0: Update only the host part of the server URL
+     * The protocol prefix is handled separately by updateProtocol()
+     * 🔧 v1.7.0 Hotfix: Removed auto-save to prevent false server-change detection
+     * 🔧 v1.7.0 Regression Fix: Restore immediate SharedPrefs write (for WebDavSyncService)
+     *    but WITHOUT server-change detection (detection happens only on screen exit)
+     */
+    fun updateServerHost(host: String) {
+        _serverHost.value = host
+        
+        // ✅ Save immediately for WebDavSyncService, but WITHOUT server-change detection
+        val prefix = if (_isHttps.value) "https://" else "http://"
+        val fullUrl = if (host.isEmpty()) "" else prefix + host
+        prefs.edit().putString(Constants.KEY_SERVER_URL, fullUrl).apply()
+    }
+    
+    fun updateProtocol(useHttps: Boolean) {
+        _isHttps.value = useHttps
+        // 🌟 v1.6.0: Host stays the same, only prefix changes
+        // 🔧 v1.7.0 Hotfix: Removed auto-save to prevent false server-change detection
+        // 🔧 v1.7.0 Regression Fix: Restore immediate SharedPrefs write (for WebDavSyncService)
+        
+        // ✅ Save immediately for WebDavSyncService, but WITHOUT server-change detection
+        val prefix = if (useHttps) "https://" else "http://"
+        val fullUrl = if (_serverHost.value.isEmpty()) "" else prefix + _serverHost.value
+        prefs.edit().putString(Constants.KEY_SERVER_URL, fullUrl).apply()
+    }
+    
+    fun updateUsername(value: String) {
+        _username.value = value
+        // 🔧 v1.7.0 Regression Fix: Restore immediate SharedPrefs write (for WebDavSyncService)
+        prefs.edit().putString(Constants.KEY_USERNAME, value).apply()
+    }
+    
+    fun updatePassword(value: String) {
+        _password.value = value
+        // 🔧 v1.7.0 Regression Fix: Restore immediate SharedPrefs write (for WebDavSyncService)
+        prefs.edit().putString(Constants.KEY_PASSWORD, value).apply()
+    }
+    
+    /**
+     * 🔧 v1.7.0 Hotfix: Manual save function - only called when leaving settings screen
+     * This prevents false "server changed" detection during text input
+     * 🔧 v1.7.0 Regression Fix: Settings are now saved IMMEDIATELY in update functions.
+     *    This function now ONLY handles server-change detection and sync reset.
+     */
+    fun saveServerSettingsManually() {
+        // 🌟 v1.6.0: Construct full URL from prefix + host
+        val prefix = if (_isHttps.value) "https://" else "http://"
+        val fullUrl = if (_serverHost.value.isEmpty()) "" else prefix + _serverHost.value
+        
+        // 🔄 v1.7.0: Detect server change ONLY against last confirmed URL
+        val serverChanged = isServerReallyChanged(confirmedServerUrl, fullUrl)
+        
+        // ✅ Settings are already saved in updateServerHost/Protocol/Username/Password
+        // This function now ONLY handles server-change detection
+        
+        // Reset sync status if server actually changed
+        if (serverChanged) {
+            viewModelScope.launch {
+                val count = notesStorage.resetAllSyncStatusToPending()
+                Logger.d(TAG, "🔄 Server changed from '$confirmedServerUrl' to '$fullUrl': Reset $count notes to PENDING")
+                emitToast(getString(R.string.toast_server_changed_sync_reset, count))
+            }
+            // Update confirmed state after reset
+            confirmedServerUrl = fullUrl
+        } else {
+            Logger.d(TAG, "💾 Server settings check complete (no server change detected)")
+        }
+    }
+    
+    /**
+     * <20> v1.7.0 Hotfix: Improved server change detection
+     * 
+     * Only returns true if the server URL actually changed in a meaningful way.
+     * Handles edge cases:
+     * - First setup (empty → filled) = NOT a change
+     * - Protocol only (http → https) = NOT a change
+     * - Server removed (filled → empty) = NOT a change
+     * - Trailing slashes, case differences = NOT a change
+     * - Different hostname/port/path = IS a change ✓
+     */
+    private fun isServerReallyChanged(confirmedUrl: String, newUrl: String): Boolean {
+        // Empty → Non-empty = First setup, NOT a change
+        if (confirmedUrl.isEmpty() && newUrl.isNotEmpty()) {
+            Logger.d(TAG, "First server setup detected (no reset needed)")
+            return false
+        }
+        
+        // Both empty = No change
+        if (confirmedUrl.isEmpty() && newUrl.isEmpty()) {
+            return false
+        }
+        
+        // Non-empty → Empty = Server removed (keep notes local, no reset)
+        if (confirmedUrl.isNotEmpty() && newUrl.isEmpty()) {
+            Logger.d(TAG, "Server removed (notes stay local, no reset needed)")
+            return false
+        }
+        
+        // Same URL = No change
+        if (confirmedUrl == newUrl) {
+            return false
+        }
+        
+        // Normalize URLs for comparison (ignore protocol, trailing slash, case)
+        val normalize = { url: String ->
+            url.trim()
+                .removePrefix("http://")
+                .removePrefix("https://")
+                .removeSuffix("/")
+                .lowercase()
+        }
+        
+        val confirmedNormalized = normalize(confirmedUrl)
+        val newNormalized = normalize(newUrl)
+        
+        // Check if normalized URLs differ
+        val changed = confirmedNormalized != newNormalized
+        
+        if (changed) {
+            Logger.d(TAG, "Server URL changed: '$confirmedNormalized' → '$newNormalized'")
+        }
+        
+        return changed
+    }
+    
+    fun testConnection() {
+        viewModelScope.launch {
+            _serverStatus.value = ServerStatus.Checking
+            try {
+                val syncService = WebDavSyncService(getApplication())
+                val result = syncService.testConnection()
+                _serverStatus.value = if (result.isSuccess) {
+                    ServerStatus.Reachable
+                } else {
+                    ServerStatus.Unreachable(result.errorMessage)
+                }
+                val message = if (result.isSuccess) {
+                    getString(R.string.toast_connection_success)
+                } else {
+                    getString(R.string.toast_connection_failed, result.errorMessage ?: "")
+                }
+                emitToast(message)
+            } catch (e: Exception) {
+                _serverStatus.value = ServerStatus.Unreachable(e.message)
+                emitToast(getString(R.string.toast_error, e.message ?: ""))
+            }
+        }
+    }
+    
+    fun checkServerStatus() {
+        // 🌟 v1.6.0: Respect offline mode first
+        if (_offlineMode.value) {
+            _serverStatus.value = ServerStatus.OfflineMode
+            return
+        }
+        
+        // 🌟 v1.6.0: Check if host is configured
+        val serverHost = _serverHost.value
+        if (serverHost.isEmpty()) {
+            _serverStatus.value = ServerStatus.NotConfigured
+            return
+        }
+        
+        // Construct full URL
+        val prefix = if (_isHttps.value) "https://" else "http://"
+        val serverUrl = prefix + serverHost
+        
+        viewModelScope.launch {
+            _serverStatus.value = ServerStatus.Checking
+            val isReachable = withContext(Dispatchers.IO) {
+                try {
+                    val url = URL(serverUrl)
+                    val connection = url.openConnection() as HttpURLConnection
+                    connection.connectTimeout = CONNECTION_TIMEOUT_MS
+                    connection.readTimeout = CONNECTION_TIMEOUT_MS
+                    val code = connection.responseCode
+                    connection.disconnect()
+                    code in 200..299 || code == 401
+                } catch (e: Exception) {
+                    Log.e(TAG, "Server check failed: ${e.message}")
+                    false
+                }
+            }
+            _serverStatus.value = if (isReachable) ServerStatus.Reachable else ServerStatus.Unreachable(null)
+        }
+    }
+    
+    fun syncNow() {
+        if (_isSyncing.value) return
+        viewModelScope.launch {
+            _isSyncing.value = true
+            try {
+                val syncService = WebDavSyncService(getApplication())
+                
+                // 🆕 v1.7.0: Zentrale Sync-Gate Prüfung
+                val gateResult = syncService.canSync()
+                if (!gateResult.canSync) {
+                    if (gateResult.isBlockedByWifiOnly) {
+                        emitToast(getString(R.string.sync_wifi_only_hint))
+                    } else {
+                        emitToast(getString(R.string.toast_sync_failed, "Offline mode"))
+                    }
+                    return@launch
+                }
+                
+                emitToast(getString(R.string.toast_syncing))
+                
+                if (!syncService.hasUnsyncedChanges()) {
+                    emitToast(getString(R.string.toast_already_synced))
+                    return@launch
+                }
+                
+                val result = syncService.syncNotes()
+                if (result.isSuccess) {
+                    emitToast(getString(R.string.toast_sync_success, result.syncedCount))
+                } else {
+                    emitToast(getString(R.string.toast_sync_failed, result.errorMessage ?: ""))
+                }
+            } catch (e: Exception) {
+                emitToast(getString(R.string.toast_error, e.message ?: ""))
+            } finally {
+                _isSyncing.value = false
+            }
+        }
+    }
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Sync Settings Actions
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    fun setAutoSync(enabled: Boolean) {
+        _autoSyncEnabled.value = enabled
+        prefs.edit().putBoolean(Constants.KEY_AUTO_SYNC, enabled).apply()
+        
+        viewModelScope.launch {
+            if (enabled) {
+                // v1.5.0 Fix: Trigger battery optimization check and network monitor restart
+                _events.emit(SettingsEvent.RequestBatteryOptimization)
+                _events.emit(SettingsEvent.RestartNetworkMonitor)
+                emitToast(getString(R.string.toast_auto_sync_enabled))
+            } else {
+                _events.emit(SettingsEvent.RestartNetworkMonitor)
+                emitToast(getString(R.string.toast_auto_sync_disabled))
+            }
+        }
+    }
+    
+    fun setSyncInterval(minutes: Long) {
+        _syncInterval.value = minutes
+        prefs.edit().putLong(Constants.PREF_SYNC_INTERVAL_MINUTES, minutes).apply()
+        viewModelScope.launch {
+            val text = when (minutes) {
+                15L -> getString(R.string.toast_sync_interval_15min)
+                60L -> getString(R.string.toast_sync_interval_60min)
+                else -> getString(R.string.toast_sync_interval_30min)
+            }
+            emitToast(getString(R.string.toast_sync_interval, text))
+        }
+    }
+    
+    // 🌟 v1.6.0: Configurable Sync Triggers Setters
+    
+    fun setTriggerOnSave(enabled: Boolean) {
+        _triggerOnSave.value = enabled
+        prefs.edit().putBoolean(Constants.KEY_SYNC_TRIGGER_ON_SAVE, enabled).apply()
+        Logger.d(TAG, "Trigger onSave: $enabled")
+    }
+    
+    fun setTriggerOnResume(enabled: Boolean) {
+        _triggerOnResume.value = enabled
+        prefs.edit().putBoolean(Constants.KEY_SYNC_TRIGGER_ON_RESUME, enabled).apply()
+        Logger.d(TAG, "Trigger onResume: $enabled")
+    }
+    
+    fun setTriggerWifiConnect(enabled: Boolean) {
+        _triggerWifiConnect.value = enabled
+        prefs.edit().putBoolean(Constants.KEY_SYNC_TRIGGER_WIFI_CONNECT, enabled).apply()
+        viewModelScope.launch {
+            _events.emit(SettingsEvent.RestartNetworkMonitor)
+        }
+        Logger.d(TAG, "Trigger WiFi-Connect: $enabled")
+    }
+    
+    fun setTriggerPeriodic(enabled: Boolean) {
+        _triggerPeriodic.value = enabled
+        prefs.edit().putBoolean(Constants.KEY_SYNC_TRIGGER_PERIODIC, enabled).apply()
+        viewModelScope.launch {
+            _events.emit(SettingsEvent.RestartNetworkMonitor)
+        }
+        Logger.d(TAG, "Trigger Periodic: $enabled")
+    }
+    
+    fun setTriggerBoot(enabled: Boolean) {
+        _triggerBoot.value = enabled
+        prefs.edit().putBoolean(Constants.KEY_SYNC_TRIGGER_BOOT, enabled).apply()
+        Logger.d(TAG, "Trigger Boot: $enabled")
+    }
+    
+    /**
+     * 🎉 v1.7.0: Set WiFi-only sync mode
+     * When enabled, sync only happens when connected to WiFi
+     */
+    fun setWifiOnlySync(enabled: Boolean) {
+        _wifiOnlySync.value = enabled
+        prefs.edit().putBoolean(Constants.KEY_WIFI_ONLY_SYNC, enabled).apply()
+        Logger.d(TAG, "📡 WiFi-only sync: $enabled")
+    }
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Markdown Settings Actions
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    fun setMarkdownAutoSync(enabled: Boolean) {
+        if (enabled) {
+            // v1.5.0 Fix: Perform initial export when enabling (like old SettingsActivity)
+            viewModelScope.launch {
+                try {
+                    // Check server configuration first
+                    val serverUrl = prefs.getString(Constants.KEY_SERVER_URL, "") ?: ""
+                    val username = prefs.getString(Constants.KEY_USERNAME, "") ?: ""
+                    val password = prefs.getString(Constants.KEY_PASSWORD, "") ?: ""
+                    
+                    if (serverUrl.isBlank() || username.isBlank() || password.isBlank()) {
+                        emitToast(getString(R.string.toast_configure_server_first))
+                        // Don't enable - revert state
+                        return@launch
+                    }
+                    
+                    // Check if there are notes to export
+                    val noteStorage = dev.dettmer.simplenotes.storage.NotesStorage(getApplication())
+                    val noteCount = noteStorage.loadAllNotes().size
+                    
+                    if (noteCount > 0) {
+                        // Show progress and perform initial export
+                        _markdownExportProgress.value = MarkdownExportProgress(0, noteCount)
+                        
+                        val syncService = WebDavSyncService(getApplication())
+                        val exportedCount = withContext(Dispatchers.IO) {
+                            syncService.exportAllNotesToMarkdown(
+                                serverUrl = serverUrl,
+                                username = username,
+                                password = password,
+                                onProgress = { current, total ->
+                                    _markdownExportProgress.value = MarkdownExportProgress(current, total)
+                                }
+                            )
+                        }
+                        
+                        // Export successful - save settings
+                        _markdownAutoSync.value = true
+                        prefs.edit()
+                            .putBoolean(Constants.KEY_MARKDOWN_EXPORT, true)
+                            .putBoolean(Constants.KEY_MARKDOWN_AUTO_IMPORT, true)
+                            .apply()
+                        
+                        _markdownExportProgress.value = MarkdownExportProgress(noteCount, noteCount, isComplete = true)
+                        emitToast(getString(R.string.toast_markdown_exported, exportedCount))
+                        
+                        @Suppress("MagicNumber") // UI progress delay
+                        // Clear progress after short delay
+                        kotlinx.coroutines.delay(500)
+                        _markdownExportProgress.value = null
+                        
+                    } else {
+                        // No notes - just enable the feature
+                        _markdownAutoSync.value = true
+                        prefs.edit()
+                            .putBoolean(Constants.KEY_MARKDOWN_EXPORT, true)
+                            .putBoolean(Constants.KEY_MARKDOWN_AUTO_IMPORT, true)
+                            .apply()
+                        emitToast(getString(R.string.toast_markdown_enabled))
+                    }
+                    
+                } catch (e: Exception) {
+                    _markdownExportProgress.value = null
+                    emitToast(getString(R.string.toast_export_failed, e.message ?: ""))
+                    // Don't enable on error
+                }
+            }
+        } else {
+            // Disable - simple
+            _markdownAutoSync.value = false
+            prefs.edit()
+                .putBoolean(Constants.KEY_MARKDOWN_EXPORT, false)
+                .putBoolean(Constants.KEY_MARKDOWN_AUTO_IMPORT, false)
+                .apply()
+            viewModelScope.launch {
+                emitToast(getString(R.string.toast_markdown_disabled))
+            }
+        }
+    }
+    
+    fun performManualMarkdownSync() {
+        // 🌟 v1.6.0: Block in offline mode
+        if (_offlineMode.value) {
+            Logger.d(TAG, "⏭️ Manual Markdown sync blocked: Offline mode enabled")
+            return
+        }
+        
+        viewModelScope.launch {
+            try {
+                emitToast(getString(R.string.toast_markdown_syncing))
+                val syncService = WebDavSyncService(getApplication())
+                val result = syncService.manualMarkdownSync()
+                emitToast(getString(R.string.toast_markdown_result, result.exportedCount, result.importedCount))
+            } catch (e: Exception) {
+                emitToast(getString(R.string.toast_error, e.message ?: ""))
+            }
+        }
+    }
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Backup Actions
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    fun createBackup(uri: Uri, password: String? = null) {
+        viewModelScope.launch {
+            _isBackupInProgress.value = true
+            try {
+                val result = backupManager.createBackup(uri, password)
+                val message = if (result.success) {
+                    getString(R.string.toast_backup_success, result.message ?: "")
+                } else {
+                    getString(R.string.toast_backup_failed, result.error ?: "")
+                }
+                emitToast(message)
+            } catch (e: Exception) {
+                emitToast(getString(R.string.toast_backup_failed, e.message ?: ""))
+            } finally {
+                _isBackupInProgress.value = false
+            }
+        }
+    }
+    
+    fun restoreFromFile(uri: Uri, mode: RestoreMode, password: String? = null) {
+        viewModelScope.launch {
+            _isBackupInProgress.value = true
+            try {
+                val result = backupManager.restoreBackup(uri, mode, password)
+                val message = if (result.success) {
+                    getString(R.string.toast_restore_success, result.importedNotes)
+                } else {
+                    getString(R.string.toast_restore_failed, result.error ?: "")
+                }
+                emitToast(message)
+            } catch (e: Exception) {
+                emitToast(getString(R.string.toast_restore_failed, e.message ?: ""))
+            } finally {
+                _isBackupInProgress.value = false
+            }
+        }
+    }
+    
+    /**
+     * 🔐 v1.7.0: Check if backup is encrypted and call appropriate callback
+     */
+    fun checkBackupEncryption(
+        uri: Uri,
+        onEncrypted: () -> Unit,
+        onPlaintext: () -> Unit
+    ) {
+        viewModelScope.launch {
+            try {
+                val isEncrypted = backupManager.isBackupEncrypted(uri)
+                if (isEncrypted) {
+                    onEncrypted()
+                } else {
+                    onPlaintext()
+                }
+            } catch (e: Exception) {
+                Logger.e(TAG, "Failed to check encryption status", e)
+                onPlaintext()  // Assume plaintext on error
+            }
+        }
+    }
+    
+    fun restoreFromServer(mode: RestoreMode) {
+        viewModelScope.launch {
+            _isBackupInProgress.value = true
+            try {
+                emitToast(getString(R.string.restore_progress))
+                val syncService = WebDavSyncService(getApplication())
+                val result = withContext(Dispatchers.IO) {
+                    syncService.restoreFromServer(mode)
+                }
+                val message = if (result.isSuccess) {
+                    getString(R.string.toast_restore_success, result.restoredCount)
+                } else {
+                    getString(R.string.toast_restore_failed, result.errorMessage ?: "")
+                }
+                emitToast(message)
+            } catch (e: Exception) {
+                emitToast(getString(R.string.toast_error, e.message ?: ""))
+            } finally {
+                _isBackupInProgress.value = false
+            }
+        }
+    }
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Debug Settings Actions
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    fun setFileLogging(enabled: Boolean) {
+        _fileLoggingEnabled.value = enabled
+        prefs.edit().putBoolean(Constants.KEY_FILE_LOGGING_ENABLED, enabled).apply()
+        Logger.setFileLoggingEnabled(enabled)
+        viewModelScope.launch {
+            emitToast(if (enabled) getString(R.string.toast_file_logging_enabled) else getString(R.string.toast_file_logging_disabled))
+        }
+    }
+    
+    fun clearLogs() {
+        viewModelScope.launch {
+            try {
+                val cleared = Logger.clearLogFile(getApplication())
+                emitToast(if (cleared) getString(R.string.toast_logs_deleted) else getString(R.string.toast_logs_deleted))
+            } catch (e: Exception) {
+                emitToast(getString(R.string.toast_error, e.message ?: ""))
+            }
+        }
+    }
+    
+    fun getLogFile() = Logger.getLogFile(getApplication())
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // Helper
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    /**
+     * Check if server is configured AND not in offline mode
+     * v1.6.0: Returns false if offline mode is enabled
+     */
+    fun isServerConfigured(): Boolean {
+        // Offline mode takes priority
+        if (_offlineMode.value) return false
+        
+        val serverUrl = prefs.getString(Constants.KEY_SERVER_URL, null)
+        return !serverUrl.isNullOrEmpty() && 
+               serverUrl != "http://" && 
+               serverUrl != "https://"
+    }
+    
+    /**
+     * 🌍 v1.7.1: Get string resources with correct app locale
+     * 
+     * AndroidViewModel uses Application context which may not have the correct locale
+     * applied when using per-app language settings. We need to get a Context that
+     * respects AppCompatDelegate.getApplicationLocales().
+     */
+    private fun getString(resId: Int): String {
+        // Get context with correct locale configuration from AppCompatDelegate
+        val appLocales = androidx.appcompat.app.AppCompatDelegate.getApplicationLocales()
+        val context = if (!appLocales.isEmpty) {
+            // Create configuration with app locale
+            val config = android.content.res.Configuration(getApplication<Application>().resources.configuration)
+            config.setLocale(appLocales.get(0))
+            getApplication<Application>().createConfigurationContext(config)
+        } else {
+            // Use system locale (default)
+            getApplication<Application>()
+        }
+        return context.getString(resId)
+    }
+    
+    private fun getString(resId: Int, vararg formatArgs: Any): String {
+        // Get context with correct locale configuration from AppCompatDelegate
+        val appLocales = androidx.appcompat.app.AppCompatDelegate.getApplicationLocales()
+        val context = if (!appLocales.isEmpty) {
+            // Create configuration with app locale
+            val config = android.content.res.Configuration(getApplication<Application>().resources.configuration)
+            config.setLocale(appLocales.get(0))
+            getApplication<Application>().createConfigurationContext(config)
+        } else {
+            // Use system locale (default)
+            getApplication<Application>()
+        }
+        return context.getString(resId, *formatArgs)
+    }
+    
+    private suspend fun emitToast(message: String) {
+        _showToast.emit(message)
+    }
+    
+    /**
+     * Server status states
+     * v1.6.0: Added OfflineMode state
+     */
+    sealed class ServerStatus {
+        data object Unknown : ServerStatus()
+        data object OfflineMode : ServerStatus()  // 🌟 v1.6.0
+        data object NotConfigured : ServerStatus()
+        data object Checking : ServerStatus()
+        data object Reachable : ServerStatus()
+        data class Unreachable(val error: String?) : ServerStatus()
+    }
+    
+    /**
+     * Events for Activity-level actions (dialogs, intents, etc.)
+     * v1.5.0: Ported from old SettingsActivity
+     */
+    sealed class SettingsEvent {
+        data object RequestBatteryOptimization : SettingsEvent()
+        data object RestartNetworkMonitor : SettingsEvent()
+    }
+    
+    /**
+     * Progress state for Markdown export
+     * v1.5.0: For initial export progress dialog
+     */
+    data class MarkdownExportProgress(
+        val current: Int,
+        val total: Int,
+        val isComplete: Boolean = false
+    )
+    
+    // ═══════════════════════════════════════════════════════════════════════
+    // 🎨 v1.7.0: Display Mode Functions
+    // ═══════════════════════════════════════════════════════════════════════
+    
+    /**
+     * Set display mode (list or grid)
+     */
+    fun setDisplayMode(mode: String) {
+        _displayMode.value = mode
+        prefs.edit().putString(Constants.KEY_DISPLAY_MODE, mode).apply()
+        Logger.d(TAG, "Display mode changed to: $mode")
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/components/BackupPasswordDialog.kt

@@ -0,0 +1,180 @@
+package dev.dettmer.simplenotes.ui.settings.components
+
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.text.KeyboardActions
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Visibility
+import androidx.compose.material.icons.filled.VisibilityOff
+import androidx.compose.material3.AlertDialog
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.input.ImeAction
+import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.text.input.PasswordVisualTransformation
+import androidx.compose.ui.text.input.VisualTransformation
+import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.R
+
+private const val MIN_PASSWORD_LENGTH = 8
+
+/**
+ * 🔒 v1.7.0: Password input dialog for backup encryption/decryption
+ */
+@Composable
+fun BackupPasswordDialog(
+    title: String,
+    onDismiss: () -> Unit,
+    onConfirm: (password: String) -> Unit,
+    requireConfirmation: Boolean = true
+) {
+    var password by remember { mutableStateOf("") }
+    var confirmPassword by remember { mutableStateOf("") }
+    var passwordVisible by remember { mutableStateOf(false) }
+    var confirmPasswordVisible by remember { mutableStateOf(false) }
+    var errorMessage by remember { mutableStateOf<String?>(null) }
+    
+    val focusRequester = remember { FocusRequester() }
+    
+    AlertDialog(
+        onDismissRequest = onDismiss,
+        title = { Text(title) },
+        text = {
+            Column {
+                // Password field
+                OutlinedTextField(
+                    value = password,
+                    onValueChange = { 
+                        password = it
+                        errorMessage = null
+                    },
+                    label = { Text(stringResource(R.string.backup_encryption_password)) },
+                    placeholder = { Text(stringResource(R.string.backup_encryption_password_hint)) },
+                    visualTransformation = if (passwordVisible) VisualTransformation.None else PasswordVisualTransformation(),
+                    trailingIcon = {
+                        IconButton(onClick = { passwordVisible = !passwordVisible }) {
+                            Icon(
+                                imageVector = if (passwordVisible) Icons.Filled.Visibility else Icons.Filled.VisibilityOff,
+                                contentDescription = null
+                            )
+                        }
+                    },
+                    keyboardOptions = KeyboardOptions(
+                        keyboardType = KeyboardType.Password,
+                        imeAction = if (requireConfirmation) ImeAction.Next else ImeAction.Done
+                    ),
+                    keyboardActions = KeyboardActions(
+                        onDone = if (!requireConfirmation) {
+                            { validateAndConfirm(password, null, onConfirm) { errorMessage = it } }
+                        } else null
+                    ),
+                    singleLine = true,
+                    isError = errorMessage != null,
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .focusRequester(focusRequester)
+                )
+                
+                // Confirm password field (only for encryption, not decryption)
+                if (requireConfirmation) {
+                    Spacer(modifier = Modifier.height(8.dp))
+                    
+                    OutlinedTextField(
+                        value = confirmPassword,
+                        onValueChange = { 
+                            confirmPassword = it
+                            errorMessage = null
+                        },
+                        label = { Text(stringResource(R.string.backup_encryption_confirm)) },
+                        placeholder = { Text(stringResource(R.string.backup_encryption_confirm_hint)) },
+                        visualTransformation = if (confirmPasswordVisible) VisualTransformation.None else PasswordVisualTransformation(),
+                        trailingIcon = {
+                            IconButton(onClick = { confirmPasswordVisible = !confirmPasswordVisible }) {
+                                Icon(
+                                    imageVector = if (confirmPasswordVisible) Icons.Filled.Visibility else Icons.Filled.VisibilityOff,
+                                    contentDescription = null
+                                )
+                            }
+                        },
+                        keyboardOptions = KeyboardOptions(
+                            keyboardType = KeyboardType.Password,
+                            imeAction = ImeAction.Done
+                        ),
+                        keyboardActions = KeyboardActions(
+                            onDone = { validateAndConfirm(password, confirmPassword, onConfirm) { errorMessage = it } }
+                        ),
+                        singleLine = true,
+                        isError = errorMessage != null,
+                        modifier = Modifier.fillMaxWidth()
+                    )
+                }
+                
+                // Error message
+                if (errorMessage != null) {
+                    Spacer(modifier = Modifier.height(4.dp))
+                    Text(
+                        text = errorMessage!!,
+                        color = androidx.compose.material3.MaterialTheme.colorScheme.error,
+                        style = androidx.compose.material3.MaterialTheme.typography.bodySmall
+                    )
+                }
+            }
+        },
+        confirmButton = {
+            TextButton(
+                onClick = {
+                    validateAndConfirm(
+                        password,
+                        if (requireConfirmation) confirmPassword else null,
+                        onConfirm
+                    ) { errorMessage = it }
+                }
+            ) {
+                Text("OK")
+            }
+        },
+        dismissButton = {
+            TextButton(onClick = onDismiss) {
+                Text(stringResource(android.R.string.cancel))
+            }
+        }
+    )
+}
+
+/**
+ * Validate password and call onConfirm if valid
+ */
+private fun validateAndConfirm(
+    password: String,
+    confirmPassword: String?,
+    onConfirm: (String) -> Unit,
+    onError: (String) -> Unit
+) {
+    when {
+        password.length < MIN_PASSWORD_LENGTH -> {
+            onError("Password too short (min. $MIN_PASSWORD_LENGTH characters)")
+        }
+        confirmPassword != null && password != confirmPassword -> {
+            onError("Passwords don't match")
+        }
+        else -> {
+            onConfirm(password)
+        }
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/components/SettingsCard.kt

@@ -0,0 +1,113 @@
+package dev.dettmer.simplenotes.ui.settings.components
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.KeyboardArrowRight
+import androidx.compose.material3.Card
+import androidx.compose.material3.CardDefaults
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.unit.dp
+
+/**
+ * Clickable Settings group card with icon, title, subtitle and optional status
+ * v1.5.0: Jetpack Compose Settings Redesign
+ */
+@Composable
+fun SettingsCard(
+    icon: ImageVector,
+    title: String,
+    modifier: Modifier = Modifier,
+    subtitle: String? = null,
+    statusText: String? = null,
+    statusColor: Color = MaterialTheme.colorScheme.onSurfaceVariant,
+    onClick: () -> Unit
+) {
+    Card(
+        modifier = modifier
+            .fillMaxWidth()
+            .padding(horizontal = 16.dp, vertical = 4.dp)
+            .clickable(onClick = onClick),
+        shape = RoundedCornerShape(16.dp),
+        colors = CardDefaults.cardColors(
+            containerColor = MaterialTheme.colorScheme.surfaceContainerHigh
+        )
+    ) {
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(16.dp),
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            // Icon with circle background
+            Box(
+                modifier = Modifier
+                    .size(40.dp)
+                    .background(
+                        color = MaterialTheme.colorScheme.primaryContainer,
+                        shape = CircleShape
+                    ),
+                contentAlignment = Alignment.Center
+            ) {
+                Icon(
+                    imageVector = icon,
+                    contentDescription = null,
+                    tint = MaterialTheme.colorScheme.onPrimaryContainer,
+                    modifier = Modifier.size(20.dp)
+                )
+            }
+            
+            Spacer(modifier = Modifier.width(16.dp))
+            
+            // Content
+            Column(modifier = Modifier.weight(1f)) {
+                Text(
+                    text = title,
+                    style = MaterialTheme.typography.titleMedium,
+                    color = MaterialTheme.colorScheme.onSurface
+                )
+                if (subtitle != null) {
+                    Spacer(modifier = Modifier.height(2.dp))
+                    Text(
+                        text = subtitle,
+                        style = MaterialTheme.typography.bodyMedium,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                    )
+                }
+                if (statusText != null) {
+                    Spacer(modifier = Modifier.height(2.dp))
+                    Text(
+                        text = statusText,
+                        style = MaterialTheme.typography.bodySmall,
+                        color = statusColor
+                    )
+                }
+            }
+            
+            // Arrow
+            Icon(
+                imageVector = Icons.AutoMirrored.Filled.KeyboardArrowRight,
+                contentDescription = null,
+                tint = MaterialTheme.colorScheme.onSurfaceVariant
+            )
+        }
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/components/SettingsComponents.kt

@@ -0,0 +1,161 @@
+package dev.dettmer.simplenotes.ui.settings.components
+
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.Button
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedButton
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+
+/**
+ * Primary filled button for settings actions
+ * v1.5.0: Jetpack Compose Settings Redesign
+ */
+@Composable
+fun SettingsButton(
+    text: String,
+    onClick: () -> Unit,
+    modifier: Modifier = Modifier,
+    enabled: Boolean = true,
+    isLoading: Boolean = false
+) {
+    Button(
+        onClick = onClick,
+        enabled = enabled && !isLoading,
+        modifier = modifier.fillMaxWidth()
+    ) {
+        if (isLoading) {
+            CircularProgressIndicator(
+                modifier = Modifier.height(20.dp),
+                strokeWidth = 2.dp,
+                color = MaterialTheme.colorScheme.onPrimary
+            )
+        } else {
+            Text(text)
+        }
+    }
+}
+
+/**
+ * Outlined secondary button for settings actions
+ */
+@Composable
+fun SettingsOutlinedButton(
+    text: String,
+    onClick: () -> Unit,
+    modifier: Modifier = Modifier,
+    enabled: Boolean = true,
+    isLoading: Boolean = false
+) {
+    OutlinedButton(
+        onClick = onClick,
+        enabled = enabled && !isLoading,
+        modifier = modifier.fillMaxWidth()
+    ) {
+        if (isLoading) {
+            CircularProgressIndicator(
+                modifier = Modifier.height(20.dp),
+                strokeWidth = 2.dp,
+                color = MaterialTheme.colorScheme.primary
+            )
+        } else {
+            Text(text)
+        }
+    }
+}
+
+/**
+ * Danger/destructive button for settings actions
+ */
+@Composable
+fun SettingsDangerButton(
+    text: String,
+    onClick: () -> Unit,
+    modifier: Modifier = Modifier,
+    enabled: Boolean = true
+) {
+    OutlinedButton(
+        onClick = onClick,
+        enabled = enabled,
+        modifier = modifier.fillMaxWidth(),
+        colors = ButtonDefaults.outlinedButtonColors(
+            contentColor = MaterialTheme.colorScheme.error
+        )
+    ) {
+        Text(text)
+    }
+}
+
+/**
+ * Info card with description text
+ * v1.6.0: Added isWarning parameter for offline mode warning
+ */
+@Composable
+fun SettingsInfoCard(
+    text: String,
+    modifier: Modifier = Modifier,
+    isWarning: Boolean = false
+) {
+    androidx.compose.material3.Card(
+        modifier = modifier
+            .fillMaxWidth()
+            .padding(horizontal = 16.dp, vertical = 8.dp),
+        colors = androidx.compose.material3.CardDefaults.cardColors(
+            containerColor = if (isWarning) {
+                MaterialTheme.colorScheme.errorContainer
+            } else {
+                MaterialTheme.colorScheme.surfaceContainerHighest
+            }
+        )
+    ) {
+        Text(
+            text = text,
+            style = MaterialTheme.typography.bodySmall,
+            color = if (isWarning) {
+                MaterialTheme.colorScheme.onErrorContainer
+            } else {
+                MaterialTheme.colorScheme.onSurfaceVariant
+            },
+            modifier = Modifier.padding(16.dp),
+            lineHeight = MaterialTheme.typography.bodySmall.lineHeight * 1.3f
+        )
+    }
+}
+
+/**
+ * Section header text
+ */
+@Composable
+fun SettingsSectionHeader(
+    text: String,
+    modifier: Modifier = Modifier
+) {
+    Text(
+        text = text,
+        style = MaterialTheme.typography.labelLarge,
+        color = MaterialTheme.colorScheme.primary,
+        modifier = modifier.padding(horizontal = 16.dp, vertical = 8.dp)
+    )
+}
+
+/**
+ * Divider between settings groups
+ */
+@Composable
+fun SettingsDivider(
+    modifier: Modifier = Modifier
+) {
+    Spacer(modifier = modifier.height(8.dp))
+    androidx.compose.material3.HorizontalDivider(
+        modifier = Modifier.padding(horizontal = 16.dp),
+        color = MaterialTheme.colorScheme.outlineVariant
+    )
+    Spacer(modifier = Modifier.height(8.dp))
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/components/SettingsRadioGroup.kt

@@ -0,0 +1,95 @@
+@file:Suppress("MatchingDeclarationName")
+package dev.dettmer.simplenotes.ui.settings.components
+
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.selection.selectable
+import androidx.compose.foundation.selection.selectableGroup
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.RadioButton
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.semantics.Role
+import androidx.compose.ui.unit.dp
+
+/**
+ * Data class for radio option
+ */
+data class RadioOption<T>(
+    val value: T,
+    val title: String,
+    val subtitle: String? = null
+)
+
+/**
+ * Settings radio group for selecting one option
+ * v1.5.0: Jetpack Compose Settings Redesign
+ */
+@Composable
+fun <T> SettingsRadioGroup(
+    options: List<RadioOption<T>>,
+    selectedValue: T,
+    onValueSelected: (T) -> Unit,
+    modifier: Modifier = Modifier,
+    title: String? = null
+) {
+    Column(
+        modifier = modifier
+            .fillMaxWidth()
+            .selectableGroup()
+    ) {
+        if (title != null) {
+            Text(
+                text = title,
+                style = MaterialTheme.typography.labelLarge,
+                color = MaterialTheme.colorScheme.primary,
+                modifier = Modifier.padding(horizontal = 16.dp, vertical = 8.dp)
+            )
+        }
+        
+        options.forEach { option ->
+            Row(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .selectable(
+                        selected = option.value == selectedValue,
+                        onClick = { onValueSelected(option.value) },
+                        role = Role.RadioButton
+                    )
+                    .padding(horizontal = 16.dp, vertical = 12.dp),
+                verticalAlignment = Alignment.CenterVertically
+            ) {
+                RadioButton(
+                    selected = option.value == selectedValue,
+                    onClick = null // handled by selectable
+                )
+                
+                Column(
+                    modifier = Modifier
+                        .padding(start = 16.dp)
+                        .weight(1f)
+                ) {
+                    Text(
+                        text = option.title,
+                        style = MaterialTheme.typography.bodyLarge,
+                        color = MaterialTheme.colorScheme.onSurface
+                    )
+                    if (option.subtitle != null) {
+                        Spacer(modifier = Modifier.height(2.dp))
+                        Text(
+                            text = option.subtitle,
+                            style = MaterialTheme.typography.bodySmall,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant
+                        )
+                    }
+                }
+            }
+        }
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/components/SettingsScaffold.kt

@@ -0,0 +1,59 @@
+package dev.dettmer.simplenotes.ui.settings.components
+
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBar
+import androidx.compose.material3.TopAppBarDefaults
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import dev.dettmer.simplenotes.R
+
+/**
+ * Reusable Scaffold with back-navigation TopAppBar
+ * v1.5.0: Jetpack Compose Settings Redesign
+ */
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun SettingsScaffold(
+    title: String,
+    onBack: () -> Unit,
+    modifier: Modifier = Modifier,
+    content: @Composable (PaddingValues) -> Unit
+) {
+    Scaffold(
+        modifier = modifier,
+        topBar = {
+            TopAppBar(
+                title = {
+                    Text(
+                        text = title,
+                        style = MaterialTheme.typography.titleLarge
+                    )
+                },
+                navigationIcon = {
+                    IconButton(onClick = onBack) {
+                        Icon(
+                            imageVector = Icons.AutoMirrored.Filled.ArrowBack,
+                            contentDescription = stringResource(R.string.content_description_back)
+                        )
+                    }
+                },
+                colors = TopAppBarDefaults.topAppBarColors(
+                    containerColor = MaterialTheme.colorScheme.surface,
+                    titleContentColor = MaterialTheme.colorScheme.onSurface
+                )
+            )
+        },
+        containerColor = MaterialTheme.colorScheme.surface
+    ) { paddingValues ->
+        content(paddingValues)
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/components/SettingsSwitch.kt

@@ -0,0 +1,85 @@
+package dev.dettmer.simplenotes.ui.settings.components
+
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Switch
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.unit.dp
+
+/**
+ * Settings switch item with title, optional subtitle and icon
+ * v1.5.0: Jetpack Compose Settings Redesign
+ */
+@Composable
+fun SettingsSwitch(
+    title: String,
+    checked: Boolean,
+    onCheckedChange: (Boolean) -> Unit,
+    modifier: Modifier = Modifier,
+    subtitle: String? = null,
+    icon: ImageVector? = null,
+    enabled: Boolean = true
+) {
+    Row(
+        modifier = modifier
+            .fillMaxWidth()
+            .clickable(enabled = enabled) { onCheckedChange(!checked) }
+            .padding(horizontal = 16.dp, vertical = 12.dp),
+        verticalAlignment = Alignment.CenterVertically
+    ) {
+        if (icon != null) {
+            Icon(
+                imageVector = icon,
+                contentDescription = null,
+                tint = if (enabled) {
+                    MaterialTheme.colorScheme.onSurfaceVariant
+                } else {
+                    MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.38f)
+                },
+                modifier = Modifier.size(24.dp)
+            )
+            Spacer(modifier = Modifier.width(16.dp))
+        }
+        
+        Column(modifier = Modifier.weight(1f)) {
+            Text(
+                text = title,
+                style = MaterialTheme.typography.bodyLarge,
+                color = if (enabled) {
+                    MaterialTheme.colorScheme.onSurface
+                } else {
+                    MaterialTheme.colorScheme.onSurface.copy(alpha = 0.38f)
+                }
+            )
+            if (subtitle != null) {
+                Text(
+                    text = subtitle,
+                    style = MaterialTheme.typography.bodyMedium,
+                    color = if (enabled) {
+                        MaterialTheme.colorScheme.onSurfaceVariant
+                    } else {
+                        MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.38f)
+                    }
+                )
+            }
+        }
+        
+        Switch(
+            checked = checked,
+            onCheckedChange = onCheckedChange,
+            enabled = enabled
+        )
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/screens/AboutScreen.kt

@@ -0,0 +1,242 @@
+package dev.dettmer.simplenotes.ui.settings.screens
+
+import android.content.Intent
+import android.graphics.Bitmap
+import android.graphics.Canvas
+import android.net.Uri
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.KeyboardArrowRight
+import androidx.compose.material.icons.filled.Code
+import androidx.compose.material.icons.filled.Person
+import androidx.compose.material.icons.filled.Policy
+import androidx.compose.material3.Card
+import androidx.compose.material3.CardDefaults
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.asImageBitmap
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import androidx.core.content.ContextCompat
+import dev.dettmer.simplenotes.BuildConfig
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.ui.settings.components.SettingsDivider
+import dev.dettmer.simplenotes.ui.settings.components.SettingsScaffold
+import dev.dettmer.simplenotes.ui.settings.components.SettingsSectionHeader
+
+/**
+ * About app information screen
+ * v1.5.0: Jetpack Compose Settings Redesign
+ */
+@Composable
+fun AboutScreen(
+    onBack: () -> Unit
+) {
+    val context = LocalContext.current
+    
+    val githubRepoUrl = "https://github.com/inventory69/simple-notes-sync"
+    val githubProfileUrl = "https://github.com/inventory69"
+    val licenseUrl = "https://github.com/inventory69/simple-notes-sync/blob/main/LICENSE"
+    
+    SettingsScaffold(
+        title = stringResource(R.string.about_settings_title),
+        onBack = onBack
+    ) { paddingValues ->
+        Column(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(paddingValues)
+                .verticalScroll(rememberScrollState())
+        ) {
+            Spacer(modifier = Modifier.height(16.dp))
+            
+            // App Info Card
+            Card(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(horizontal = 16.dp),
+                colors = CardDefaults.cardColors(
+                    containerColor = MaterialTheme.colorScheme.primaryContainer
+                )
+            ) {
+                Column(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .padding(24.dp),
+                    horizontalAlignment = Alignment.CenterHorizontally
+                ) {
+                    // v1.5.0: App icon foreground loaded directly for better quality
+                    val context = LocalContext.current
+                    val appIcon = remember {
+                        val drawable = ContextCompat.getDrawable(context, R.mipmap.ic_launcher_foreground)
+                        drawable?.let {
+                            // Use fixed size for consistent quality (256x256)
+                            val size = 256
+                            val bitmap = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888)
+                            val canvas = Canvas(bitmap)
+                            it.setBounds(0, 0, size, size)
+                            it.draw(canvas)
+                            bitmap.asImageBitmap()
+                        }
+                    }
+                    
+                    appIcon?.let {
+                        Image(
+                            bitmap = it,
+                            contentDescription = stringResource(R.string.about_app_name),
+                            modifier = Modifier.size(96.dp)
+                        )
+                    }
+                    
+                    Spacer(modifier = Modifier.height(8.dp))
+                    
+                    Text(
+                        text = stringResource(R.string.about_app_name),
+                        style = MaterialTheme.typography.headlineSmall,
+                        color = MaterialTheme.colorScheme.onPrimaryContainer
+                    )
+                    
+                    Spacer(modifier = Modifier.height(4.dp))
+                    
+                    Text(
+                        text = stringResource(R.string.about_version, BuildConfig.VERSION_NAME, BuildConfig.VERSION_CODE),
+                        style = MaterialTheme.typography.bodyMedium,
+                        color = MaterialTheme.colorScheme.onPrimaryContainer.copy(alpha = 0.8f)
+                    )
+                }
+            }
+            
+            Spacer(modifier = Modifier.height(24.dp))
+            
+            SettingsSectionHeader(text = stringResource(R.string.about_links_section))
+            
+            // GitHub Repository
+            AboutLinkItem(
+                icon = Icons.Default.Code,
+                title = stringResource(R.string.about_github_title),
+                subtitle = stringResource(R.string.about_github_subtitle),
+                onClick = {
+                    val intent = Intent(Intent.ACTION_VIEW, Uri.parse(githubRepoUrl))
+                    context.startActivity(intent)
+                }
+            )
+            
+            // Developer
+            AboutLinkItem(
+                icon = Icons.Default.Person,
+                title = stringResource(R.string.about_developer_title),
+                subtitle = stringResource(R.string.about_developer_subtitle),
+                onClick = {
+                    val intent = Intent(Intent.ACTION_VIEW, Uri.parse(githubProfileUrl))
+                    context.startActivity(intent)
+                }
+            )
+            
+            // License
+            AboutLinkItem(
+                icon = Icons.Default.Policy,
+                title = stringResource(R.string.about_license_title),
+                subtitle = stringResource(R.string.about_license_subtitle),
+                onClick = {
+                    val intent = Intent(Intent.ACTION_VIEW, Uri.parse(licenseUrl))
+                    context.startActivity(intent)
+                }
+            )
+            
+            SettingsDivider()
+            
+            // Data Privacy Info
+            Card(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(horizontal = 16.dp),
+                colors = CardDefaults.cardColors(
+                    containerColor = MaterialTheme.colorScheme.surfaceContainerHighest
+                )
+            ) {
+                Column(
+                    modifier = Modifier.padding(16.dp)
+                ) {
+                    Text(
+                        text = stringResource(R.string.about_privacy_title),
+                        style = MaterialTheme.typography.titleSmall
+                    )
+                    Spacer(modifier = Modifier.height(8.dp))
+                    Text(
+                        text = stringResource(R.string.about_privacy_text),
+                        style = MaterialTheme.typography.bodySmall,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                    )
+                }
+            }
+            
+            Spacer(modifier = Modifier.height(16.dp))
+        }
+    }
+}
+
+/**
+ * Clickable link item for About section
+ */
+@Composable
+private fun AboutLinkItem(
+    icon: ImageVector,
+    title: String,
+    subtitle: String,
+    onClick: () -> Unit
+) {
+    Row(
+        modifier = Modifier
+            .fillMaxWidth()
+            .clickable(onClick = onClick)
+            .padding(horizontal = 16.dp, vertical = 12.dp),
+        verticalAlignment = Alignment.CenterVertically
+    ) {
+        Icon(
+            imageVector = icon,
+            contentDescription = null,
+            tint = MaterialTheme.colorScheme.primary,
+            modifier = Modifier.size(24.dp)
+        )
+        
+        Spacer(modifier = Modifier.width(16.dp))
+        
+        Column(modifier = Modifier.weight(1f)) {
+            Text(
+                text = title,
+                style = MaterialTheme.typography.bodyLarge,
+                color = MaterialTheme.colorScheme.onSurface
+            )
+            Text(
+                text = subtitle,
+                style = MaterialTheme.typography.bodyMedium,
+                color = MaterialTheme.colorScheme.onSurfaceVariant
+            )
+        }
+        
+        Icon(
+            imageVector = Icons.AutoMirrored.Filled.KeyboardArrowRight,
+            contentDescription = null,
+            tint = MaterialTheme.colorScheme.onSurfaceVariant
+        )
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/screens/BackupSettingsScreen.kt

@@ -0,0 +1,350 @@
+package dev.dettmer.simplenotes.ui.settings.screens
+
+import android.net.Uri
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.AlertDialog
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.backup.RestoreMode
+import dev.dettmer.simplenotes.ui.settings.SettingsViewModel
+import dev.dettmer.simplenotes.ui.settings.components.BackupPasswordDialog
+import dev.dettmer.simplenotes.ui.settings.components.RadioOption
+import dev.dettmer.simplenotes.ui.settings.components.SettingsButton
+import dev.dettmer.simplenotes.ui.settings.components.SettingsDivider
+import dev.dettmer.simplenotes.ui.settings.components.SettingsInfoCard
+import dev.dettmer.simplenotes.ui.settings.components.SettingsOutlinedButton
+import dev.dettmer.simplenotes.ui.settings.components.SettingsRadioGroup
+import dev.dettmer.simplenotes.ui.settings.components.SettingsScaffold
+import dev.dettmer.simplenotes.ui.settings.components.SettingsSectionHeader
+import dev.dettmer.simplenotes.ui.settings.components.SettingsSwitch
+import java.text.SimpleDateFormat
+import java.util.Date
+import java.util.Locale
+
+/**
+ * Backup and restore settings screen
+ * v1.5.0: Jetpack Compose Settings Redesign
+ */
+@Composable
+fun BackupSettingsScreen(
+    viewModel: SettingsViewModel,
+    onBack: () -> Unit
+) {
+    val isBackupInProgress by viewModel.isBackupInProgress.collectAsState()
+    
+    // 🌟 v1.6.0: Check if server restore is available
+    val isServerConfigured = viewModel.isServerConfigured()
+    
+    // Restore dialog state
+    var showRestoreDialog by remember { mutableStateOf(false) }
+    var restoreSource by remember { mutableStateOf<RestoreSource>(RestoreSource.LocalFile) }
+    var pendingRestoreUri by remember { mutableStateOf<Uri?>(null) }
+    var selectedRestoreMode by remember { mutableStateOf(RestoreMode.MERGE) }
+    
+    // 🔐 v1.7.0: Encryption state
+    var encryptBackup by remember { mutableStateOf(false) }
+    var showEncryptionPasswordDialog by remember { mutableStateOf(false) }
+    var showDecryptionPasswordDialog by remember { mutableStateOf(false) }
+    var pendingBackupUri by remember { mutableStateOf<Uri?>(null) }
+    
+    // File picker launchers
+    val createBackupLauncher = rememberLauncherForActivityResult(
+        contract = ActivityResultContracts.CreateDocument("application/json")
+    ) { uri ->
+        uri?.let {
+            // 🔐 v1.7.0: If encryption enabled, show password dialog first
+            if (encryptBackup) {
+                pendingBackupUri = it
+                showEncryptionPasswordDialog = true
+            } else {
+                viewModel.createBackup(it, password = null)
+            }
+        }
+    }
+    
+    val restoreFileLauncher = rememberLauncherForActivityResult(
+        contract = ActivityResultContracts.OpenDocument()
+    ) { uri ->
+        uri?.let {
+            pendingRestoreUri = it
+            restoreSource = RestoreSource.LocalFile
+            showRestoreDialog = true
+        }
+    }
+    
+    SettingsScaffold(
+        title = stringResource(R.string.backup_settings_title),
+        onBack = onBack
+    ) { paddingValues ->
+        Column(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(paddingValues)
+                .verticalScroll(rememberScrollState())
+        ) {
+            Spacer(modifier = Modifier.height(8.dp))
+            
+            // Info Card
+            SettingsInfoCard(
+                text = stringResource(R.string.backup_auto_info)
+            )
+            
+            Spacer(modifier = Modifier.height(16.dp))
+            
+            // Local Backup Section
+            SettingsSectionHeader(text = stringResource(R.string.backup_local_section))
+            
+            Spacer(modifier = Modifier.height(8.dp))
+            
+            // 🔐 v1.7.0: Encryption toggle
+            SettingsSwitch(
+                title = stringResource(R.string.backup_encryption_title),
+                subtitle = stringResource(R.string.backup_encryption_subtitle),
+                checked = encryptBackup,
+                onCheckedChange = { encryptBackup = it }
+            )
+            
+            Spacer(modifier = Modifier.height(8.dp))
+            
+            SettingsButton(
+                text = stringResource(R.string.backup_create),
+                onClick = {
+                    val timestamp = SimpleDateFormat("yyyy-MM-dd_HHmmss", Locale.US)
+                        .format(Date())
+                    val filename = "simplenotes_backup_$timestamp.json"
+                    createBackupLauncher.launch(filename)
+                },
+                isLoading = isBackupInProgress,
+                modifier = Modifier.padding(horizontal = 16.dp)
+            )
+            
+            Spacer(modifier = Modifier.height(8.dp))
+            
+            SettingsOutlinedButton(
+                text = stringResource(R.string.backup_restore_file),
+                onClick = {
+                    restoreFileLauncher.launch(arrayOf("application/json"))
+                },
+                isLoading = isBackupInProgress,
+                modifier = Modifier.padding(horizontal = 16.dp)
+            )
+            
+            SettingsDivider()
+            
+            // Server Backup Section
+            SettingsSectionHeader(text = stringResource(R.string.backup_server_section))
+            
+            Spacer(modifier = Modifier.height(8.dp))
+            
+            // 🌟 v1.6.0: Disabled when offline mode active
+            SettingsOutlinedButton(
+                text = stringResource(R.string.backup_restore_server),
+                onClick = {
+                    restoreSource = RestoreSource.Server
+                    showRestoreDialog = true
+                },
+                isLoading = isBackupInProgress,
+                enabled = isServerConfigured,
+                modifier = Modifier.padding(horizontal = 16.dp)
+            )
+            
+            // 🌟 v1.6.0: Show hint when offline
+            if (!isServerConfigured) {
+                Spacer(modifier = Modifier.height(4.dp))
+                Text(
+                    text = stringResource(R.string.settings_sync_offline_mode),
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.tertiary,
+                    modifier = Modifier.padding(horizontal = 16.dp)
+                )
+            }
+            
+            Spacer(modifier = Modifier.height(16.dp))
+        }
+    }
+    
+    // 🔐 v1.7.0: Encryption password dialog (for backup creation)
+    if (showEncryptionPasswordDialog) {
+        BackupPasswordDialog(
+            title = stringResource(R.string.backup_encryption_title),
+            onDismiss = {
+                showEncryptionPasswordDialog = false
+                pendingBackupUri = null
+            },
+            onConfirm = { password ->
+                showEncryptionPasswordDialog = false
+                pendingBackupUri?.let { uri ->
+                    viewModel.createBackup(uri, password)
+                }
+                pendingBackupUri = null
+            },
+            requireConfirmation = true
+        )
+    }
+    
+    // 🔐 v1.7.0: Decryption password dialog (for restore)
+    if (showDecryptionPasswordDialog) {
+        BackupPasswordDialog(
+            title = stringResource(R.string.backup_decryption_required),
+            onDismiss = {
+                showDecryptionPasswordDialog = false
+                pendingRestoreUri = null
+            },
+            onConfirm = { password ->
+                showDecryptionPasswordDialog = false
+                pendingRestoreUri?.let { uri ->
+                    when (restoreSource) {
+                        RestoreSource.LocalFile -> viewModel.restoreFromFile(uri, selectedRestoreMode, password)
+                        RestoreSource.Server -> { /* Server restore doesn't support encryption */ }
+                    }
+                }
+                pendingRestoreUri = null
+            },
+            requireConfirmation = false
+        )
+    }
+    
+    // Restore Mode Dialog
+    if (showRestoreDialog) {
+        RestoreModeDialog(
+            source = restoreSource,
+            selectedMode = selectedRestoreMode,
+            onModeSelected = { selectedRestoreMode = it },
+            onConfirm = {
+                showRestoreDialog = false
+                when (restoreSource) {
+                    RestoreSource.LocalFile -> {
+                        pendingRestoreUri?.let { uri ->
+                            // 🔐 v1.7.0: Check if backup is encrypted
+                            viewModel.checkBackupEncryption(
+                                uri = uri,
+                                onEncrypted = {
+                                    showDecryptionPasswordDialog = true
+                                },
+                                onPlaintext = {
+                                    viewModel.restoreFromFile(uri, selectedRestoreMode, password = null)
+                                    pendingRestoreUri = null
+                                }
+                            )
+                        }
+                    }
+                    RestoreSource.Server -> {
+                        viewModel.restoreFromServer(selectedRestoreMode)
+                    }
+                }
+            },
+            onDismiss = {
+                showRestoreDialog = false
+                pendingRestoreUri = null
+            }
+        )
+    }
+}
+
+/**
+ * Restore source enum
+ */
+private enum class RestoreSource {
+    LocalFile,
+    Server
+}
+
+/**
+ * Dialog for selecting restore mode
+ */
+@Composable
+private fun RestoreModeDialog(
+    source: RestoreSource,
+    selectedMode: RestoreMode,
+    onModeSelected: (RestoreMode) -> Unit,
+    onConfirm: () -> Unit,
+    onDismiss: () -> Unit
+) {
+    val sourceText = when (source) {
+        RestoreSource.LocalFile -> stringResource(R.string.backup_restore_source_file)
+        RestoreSource.Server -> stringResource(R.string.backup_restore_source_server)
+    }
+    
+    val modeOptions = listOf(
+        RadioOption(
+            value = RestoreMode.MERGE,
+            title = stringResource(R.string.backup_mode_merge_title),
+            subtitle = stringResource(R.string.backup_mode_merge_subtitle)
+        ),
+        RadioOption(
+            value = RestoreMode.REPLACE,
+            title = stringResource(R.string.backup_mode_replace_title),
+            subtitle = stringResource(R.string.backup_mode_replace_subtitle)
+        ),
+        RadioOption(
+            value = RestoreMode.OVERWRITE_DUPLICATES,
+            title = stringResource(R.string.backup_mode_overwrite_title),
+            subtitle = stringResource(R.string.backup_mode_overwrite_subtitle)
+        )
+    )
+    
+    AlertDialog(
+        onDismissRequest = onDismiss,
+        title = { Text(stringResource(R.string.backup_restore_dialog_title)) },
+        text = {
+            Column {
+                Text(
+                    text = stringResource(R.string.backup_restore_source, sourceText),
+                    style = MaterialTheme.typography.bodyMedium
+                )
+                
+                Spacer(modifier = Modifier.height(16.dp))
+                
+                Text(
+                    text = stringResource(R.string.backup_restore_mode_label),
+                    style = MaterialTheme.typography.labelLarge
+                )
+                
+                Spacer(modifier = Modifier.height(8.dp))
+                
+                SettingsRadioGroup(
+                    options = modeOptions,
+                    selectedValue = selectedMode,
+                    onValueSelected = onModeSelected
+                )
+                
+                Spacer(modifier = Modifier.height(8.dp))
+                
+                Text(
+                    text = stringResource(R.string.backup_restore_info),
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant
+                )
+            }
+        },
+        confirmButton = {
+            TextButton(onClick = onConfirm) {
+                Text(stringResource(R.string.backup_restore_button))
+            }
+        },
+        dismissButton = {
+            TextButton(onClick = onDismiss) {
+                Text(stringResource(R.string.cancel))
+            }
+        }
+    )
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/screens/DebugSettingsScreen.kt

@@ -0,0 +1,150 @@
+package dev.dettmer.simplenotes.ui.settings.screens
+
+import android.content.Intent
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.Notes
+import androidx.compose.material3.AlertDialog
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import androidx.core.content.FileProvider
+import dev.dettmer.simplenotes.BuildConfig
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.ui.settings.SettingsViewModel
+import dev.dettmer.simplenotes.ui.settings.components.SettingsButton
+import dev.dettmer.simplenotes.ui.settings.components.SettingsDangerButton
+import dev.dettmer.simplenotes.ui.settings.components.SettingsDivider
+import dev.dettmer.simplenotes.ui.settings.components.SettingsInfoCard
+import dev.dettmer.simplenotes.ui.settings.components.SettingsScaffold
+import dev.dettmer.simplenotes.ui.settings.components.SettingsSectionHeader
+import dev.dettmer.simplenotes.ui.settings.components.SettingsSwitch
+
+/**
+ * Debug and diagnostics settings screen
+ * v1.5.0: Jetpack Compose Settings Redesign
+ */
+@Composable
+fun DebugSettingsScreen(
+    viewModel: SettingsViewModel,
+    onBack: () -> Unit
+) {
+    val context = LocalContext.current
+    val fileLoggingEnabled by viewModel.fileLoggingEnabled.collectAsState()
+    
+    var showClearLogsDialog by remember { mutableStateOf(false) }
+    
+    SettingsScaffold(
+        title = stringResource(R.string.debug_settings_title),
+        onBack = onBack
+    ) { paddingValues ->
+        Column(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(paddingValues)
+                .verticalScroll(rememberScrollState())
+        ) {
+            Spacer(modifier = Modifier.height(8.dp))
+            
+            // File Logging Toggle
+            SettingsSwitch(
+                title = stringResource(R.string.debug_file_logging_title),
+                subtitle = stringResource(R.string.debug_file_logging_subtitle),
+                checked = fileLoggingEnabled,
+                onCheckedChange = { viewModel.setFileLogging(it) },
+                icon = Icons.AutoMirrored.Filled.Notes
+            )
+            
+            // Privacy Info
+            SettingsInfoCard(
+                text = stringResource(R.string.debug_privacy_info)
+            )
+            
+            SettingsDivider()
+            
+            SettingsSectionHeader(text = stringResource(R.string.debug_log_actions_section))
+            
+            Spacer(modifier = Modifier.height(8.dp))
+            
+            // Export Logs Button
+            val logsSubject = stringResource(R.string.debug_logs_subject)
+            val logsShareVia = stringResource(R.string.debug_logs_share_via)
+            
+            SettingsButton(
+                text = stringResource(R.string.debug_export_logs),
+                onClick = {
+                    val logFile = viewModel.getLogFile()
+                    if (logFile != null && logFile.exists() && logFile.length() > 0L) {
+                        val logUri = FileProvider.getUriForFile(
+                            context,
+                            "${BuildConfig.APPLICATION_ID}.fileprovider",
+                            logFile
+                        )
+                        
+                        val shareIntent = Intent(Intent.ACTION_SEND).apply {
+                            type = "text/plain"
+                            putExtra(Intent.EXTRA_STREAM, logUri)
+                            putExtra(Intent.EXTRA_SUBJECT, logsSubject)
+                            addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+                        }
+                        
+                        context.startActivity(Intent.createChooser(shareIntent, logsShareVia))
+                    }
+                },
+                modifier = Modifier.padding(horizontal = 16.dp)
+            )
+            
+            Spacer(modifier = Modifier.height(8.dp))
+            
+            // Clear Logs Button
+            SettingsDangerButton(
+                text = stringResource(R.string.debug_delete_logs),
+                onClick = { showClearLogsDialog = true },
+                modifier = Modifier.padding(horizontal = 16.dp)
+            )
+            
+            Spacer(modifier = Modifier.height(16.dp))
+        }
+    }
+    
+    // Clear Logs Confirmation Dialog
+    if (showClearLogsDialog) {
+        AlertDialog(
+            onDismissRequest = { showClearLogsDialog = false },
+            title = { Text(stringResource(R.string.debug_delete_logs_title)) },
+            text = {
+                Text(stringResource(R.string.debug_delete_logs_message))
+            },
+            confirmButton = {
+                TextButton(
+                    onClick = {
+                        showClearLogsDialog = false
+                        viewModel.clearLogs()
+                    }
+                ) {
+                    Text(stringResource(R.string.delete))
+                }
+            },
+            dismissButton = {
+                TextButton(onClick = { showClearLogsDialog = false }) {
+                    Text(stringResource(R.string.cancel))
+                }
+            }
+        )
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/screens/DisplaySettingsScreen.kt

@@ -0,0 +1,74 @@
+package dev.dettmer.simplenotes.ui.settings.screens
+
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.ui.settings.SettingsViewModel
+import dev.dettmer.simplenotes.ui.settings.components.RadioOption
+import dev.dettmer.simplenotes.ui.settings.components.SettingsInfoCard
+import dev.dettmer.simplenotes.ui.settings.components.SettingsRadioGroup
+import dev.dettmer.simplenotes.ui.settings.components.SettingsScaffold
+import dev.dettmer.simplenotes.ui.settings.components.SettingsSectionHeader
+
+/**
+ * 🎨 v1.7.0: Display Settings Screen
+ * 
+ * Allows switching between List and Grid view modes.
+ */
+@Composable
+fun DisplaySettingsScreen(
+    viewModel: SettingsViewModel,
+    onBack: () -> Unit
+) {
+    val displayMode by viewModel.displayMode.collectAsState()
+    
+    SettingsScaffold(
+        title = stringResource(R.string.display_settings_title),
+        onBack = onBack
+    ) { paddingValues ->
+        Column(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(paddingValues)
+                .verticalScroll(rememberScrollState())
+        ) {
+            Spacer(modifier = Modifier.height(8.dp))
+            
+            SettingsSectionHeader(text = stringResource(R.string.display_mode_title))
+            
+            SettingsRadioGroup(
+                options = listOf(
+                    RadioOption(
+                        value = "list",
+                        title = stringResource(R.string.display_mode_list),
+                        subtitle = null
+                    ),
+                    RadioOption(
+                        value = "grid",
+                        title = stringResource(R.string.display_mode_grid),
+                        subtitle = null
+                    )
+                ),
+                selectedValue = displayMode,
+                onValueSelected = { viewModel.setDisplayMode(it) }
+            )
+            
+            SettingsInfoCard(
+                text = stringResource(R.string.display_mode_info)
+            )
+            
+            Spacer(modifier = Modifier.height(16.dp))
+        }
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/screens/LanguageSettingsScreen.kt

@@ -0,0 +1,120 @@
+package dev.dettmer.simplenotes.ui.settings.screens
+
+import android.app.Activity
+import androidx.appcompat.app.AppCompatDelegate
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import androidx.core.os.LocaleListCompat
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.ui.settings.components.RadioOption
+import dev.dettmer.simplenotes.ui.settings.components.SettingsInfoCard
+import dev.dettmer.simplenotes.ui.settings.components.SettingsRadioGroup
+import dev.dettmer.simplenotes.ui.settings.components.SettingsScaffold
+
+/**
+ * Language selection settings screen
+ * v1.5.0: Internationalization feature
+ * 
+ * Uses Android's Per-App Language API (Android 13+) with AppCompat fallback
+ */
+@Composable
+fun LanguageSettingsScreen(
+    onBack: () -> Unit
+) {
+    val context = LocalContext.current
+    
+    // Get current app locale - fresh value each time (no remember, always reads current state)
+    val currentLocale = AppCompatDelegate.getApplicationLocales()
+    val currentLanguageCode = if (currentLocale.isEmpty) {
+        "" // System default
+    } else {
+        currentLocale.get(0)?.language ?: ""
+    }
+    
+    var selectedLanguage by remember(currentLanguageCode) { mutableStateOf(currentLanguageCode) }
+    
+    // Language options
+    val languageOptions = listOf(
+        RadioOption(
+            value = "",
+            title = stringResource(R.string.language_system_default),
+            subtitle = null
+        ),
+        RadioOption(
+            value = "en",
+            title = stringResource(R.string.language_english),
+            subtitle = "English"
+        ),
+        RadioOption(
+            value = "de",
+            title = stringResource(R.string.language_german),
+            subtitle = "German"
+        )
+    )
+    
+    SettingsScaffold(
+        title = stringResource(R.string.language_settings_title),
+        onBack = onBack
+    ) { paddingValues ->
+        Column(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(paddingValues)
+                .verticalScroll(rememberScrollState())
+        ) {
+            Spacer(modifier = Modifier.height(8.dp))
+            
+            // Info card
+            SettingsInfoCard(
+                text = stringResource(R.string.language_info)
+            )
+            
+            Spacer(modifier = Modifier.height(8.dp))
+            
+            // Language selection radio group
+            SettingsRadioGroup(
+                options = languageOptions,
+                selectedValue = selectedLanguage,
+                onValueSelected = { newLanguage ->
+                    if (newLanguage != selectedLanguage) {
+                        selectedLanguage = newLanguage
+                        setAppLanguage(newLanguage, context as Activity)
+                    }
+                }
+            )
+        }
+    }
+}
+
+/**
+ * Set app language using AppCompatDelegate
+ * Works on Android 13+ natively, falls back to AppCompat on older versions
+ */
+private fun setAppLanguage(languageCode: String, activity: Activity) {
+    val localeList = if (languageCode.isEmpty()) {
+        LocaleListCompat.getEmptyLocaleList()
+    } else {
+        LocaleListCompat.forLanguageTags(languageCode)
+    }
+    
+    AppCompatDelegate.setApplicationLocales(localeList)
+    
+    // Restart the activity to apply the change
+    // On Android 13+ the system handles this automatically for some apps,
+    // but we need to recreate to ensure our Compose UI recomposes with new locale
+    activity.recreate()
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/screens/MarkdownSettingsScreen.kt

@@ -0,0 +1,150 @@
+package dev.dettmer.simplenotes.ui.settings.screens
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Description
+import androidx.compose.material3.AlertDialog
+import androidx.compose.material3.LinearProgressIndicator
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.ui.settings.SettingsViewModel
+import dev.dettmer.simplenotes.ui.settings.components.SettingsButton
+import dev.dettmer.simplenotes.ui.settings.components.SettingsDivider
+import dev.dettmer.simplenotes.ui.settings.components.SettingsInfoCard
+import dev.dettmer.simplenotes.ui.settings.components.SettingsScaffold
+import dev.dettmer.simplenotes.ui.settings.components.SettingsSwitch
+
+/**
+ * Markdown Desktop integration settings screen
+ * v1.5.0: Jetpack Compose Settings Redesign
+ */
+@Composable
+fun MarkdownSettingsScreen(
+    viewModel: SettingsViewModel,
+    onBack: () -> Unit
+) {
+    val markdownAutoSync by viewModel.markdownAutoSync.collectAsState()
+    val exportProgress by viewModel.markdownExportProgress.collectAsState()
+    
+    // 🌟 v1.6.0: Check offline mode
+    val offlineMode by viewModel.offlineMode.collectAsState()
+    val isServerConfigured = viewModel.isServerConfigured()
+    
+    // v1.5.0 Fix: Progress Dialog for initial export
+    exportProgress?.let { progress ->
+        AlertDialog(
+            onDismissRequest = { /* Not dismissable */ },
+            title = { Text(stringResource(R.string.markdown_dialog_title)) },
+            text = {
+                Column(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalAlignment = Alignment.CenterHorizontally,
+                    verticalArrangement = Arrangement.spacedBy(12.dp)
+                ) {
+                    Text(
+                        text = if (progress.isComplete) {
+                            stringResource(R.string.markdown_export_complete)
+                        } else {
+                            stringResource(R.string.markdown_export_progress, progress.current, progress.total)
+                        },
+                        style = MaterialTheme.typography.bodyMedium
+                    )
+                    
+                    LinearProgressIndicator(
+                        progress = { 
+                            if (progress.total > 0) {
+                                progress.current.toFloat() / progress.total.toFloat()
+                            } else 0f
+                        },
+                        modifier = Modifier.fillMaxWidth()
+                    )
+                }
+            },
+            confirmButton = { /* No button - auto dismiss */ }
+        )
+    }
+    
+    SettingsScaffold(
+        title = stringResource(R.string.markdown_settings_title),
+        onBack = onBack
+    ) { paddingValues ->
+        Column(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(paddingValues)
+                .verticalScroll(rememberScrollState())
+        ) {
+            Spacer(modifier = Modifier.height(8.dp))
+            
+            // Info Card
+            SettingsInfoCard(
+                text = stringResource(R.string.markdown_info)
+            )
+            
+            Spacer(modifier = Modifier.height(8.dp))
+            
+            // Markdown Auto-Sync Toggle
+            // 🌟 v1.6.0: Disabled when offline mode active
+            SettingsSwitch(
+                title = stringResource(R.string.markdown_auto_sync_title),
+                subtitle = if (!isServerConfigured) {
+                    stringResource(R.string.settings_sync_offline_mode)
+                } else {
+                    stringResource(R.string.markdown_auto_sync_subtitle)
+                },
+                checked = markdownAutoSync,
+                onCheckedChange = { viewModel.setMarkdownAutoSync(it) },
+                icon = Icons.Default.Description,
+                enabled = isServerConfigured
+            )
+            
+            // Manual sync button (only visible when auto-sync is off)
+            // 🌟 v1.6.0: Also disabled in offline mode
+            if (!markdownAutoSync) {
+                SettingsDivider()
+                
+                SettingsInfoCard(
+                    text = stringResource(R.string.markdown_manual_sync_info)
+                )
+                
+                Spacer(modifier = Modifier.height(8.dp))
+                
+                SettingsButton(
+                    text = stringResource(R.string.markdown_manual_sync_button),
+                    onClick = { viewModel.performManualMarkdownSync() },
+                    enabled = isServerConfigured,
+                    modifier = Modifier.padding(horizontal = 16.dp)
+                )
+                
+                // 🌟 v1.6.0: Show hint when offline
+                if (!isServerConfigured) {
+                    Spacer(modifier = Modifier.height(4.dp))
+                    Text(
+                        text = stringResource(R.string.settings_sync_offline_mode),
+                        style = MaterialTheme.typography.bodySmall,
+                        color = MaterialTheme.colorScheme.tertiary,
+                        modifier = Modifier.padding(horizontal = 16.dp)
+                    )
+                }
+            }
+            
+            Spacer(modifier = Modifier.height(16.dp))
+        }
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/screens/ServerSettingsScreen.kt

@@ -0,0 +1,340 @@
+package dev.dettmer.simplenotes.ui.settings.screens
+
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Language
+import androidx.compose.material.icons.filled.Lock
+import androidx.compose.material.icons.filled.Person
+import androidx.compose.material.icons.filled.Visibility
+import androidx.compose.material.icons.filled.VisibilityOff
+import androidx.compose.material3.Button
+import androidx.compose.material3.Card
+import androidx.compose.material3.CardDefaults
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.FilterChip
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedButton
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Switch
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.alpha
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.input.PasswordVisualTransformation
+import androidx.compose.ui.text.input.VisualTransformation
+import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.ui.settings.SettingsViewModel
+import dev.dettmer.simplenotes.ui.settings.components.SettingsScaffold
+
+/**
+ * Server configuration settings screen
+ * v1.5.0: Jetpack Compose Settings Redesign
+ * v1.6.0: Offline Mode Toggle
+ * v1.7.0 Hotfix: Save settings on screen exit (not on every keystroke)
+ */
+@Suppress("LongMethod", "MagicNumber") // Compose UI + Color hex values
+@Composable
+fun ServerSettingsScreen(
+    viewModel: SettingsViewModel,
+    onBack: () -> Unit
+) {
+    val offlineMode by viewModel.offlineMode.collectAsState()
+    val serverHost by viewModel.serverHost.collectAsState()  // 🌟 v1.6.0: Only host part
+    val serverUrl by viewModel.serverUrl.collectAsState()    // Full URL for display
+    val username by viewModel.username.collectAsState()
+    val password by viewModel.password.collectAsState()
+    val isHttps by viewModel.isHttps.collectAsState()
+    val serverStatus by viewModel.serverStatus.collectAsState()
+    val isSyncing by viewModel.isSyncing.collectAsState()
+    
+    var passwordVisible by remember { mutableStateOf(false) }
+    
+    // 🔧 v1.7.0 Hotfix: Save server settings when leaving this screen
+    // This prevents false "server changed" detection during text input
+    DisposableEffect(Unit) {
+        onDispose {
+            viewModel.saveServerSettingsManually()
+        }
+    }
+    
+    // Check server status on load (only if not in offline mode)
+    LaunchedEffect(offlineMode) {
+        if (!offlineMode) {
+            viewModel.checkServerStatus()
+        }
+    }
+    
+    SettingsScaffold(
+        title = stringResource(R.string.server_settings_title),
+        onBack = onBack
+    ) { paddingValues ->
+        Column(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(paddingValues)
+                .verticalScroll(rememberScrollState())
+                .padding(16.dp)
+        ) {
+            // ═══════════════════════════════════════════════════════════════
+            // 🌟 v1.6.0: Offline-Modus Toggle (TOP)
+            // ═══════════════════════════════════════════════════════════════
+            
+            Card(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .clickable { viewModel.setOfflineMode(!offlineMode) },
+                colors = CardDefaults.cardColors(
+                    containerColor = if (offlineMode) {
+                        MaterialTheme.colorScheme.tertiaryContainer
+                    } else {
+                        MaterialTheme.colorScheme.surfaceContainerHighest
+                    }
+                )
+            ) {
+                Row(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .padding(16.dp),
+                    horizontalArrangement = Arrangement.SpaceBetween,
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    Column(modifier = Modifier.weight(1f)) {
+                        Text(
+                            text = stringResource(R.string.server_offline_mode_title),
+                            style = MaterialTheme.typography.titleMedium
+                        )
+                        Text(
+                            text = stringResource(R.string.server_offline_mode_subtitle),
+                            style = MaterialTheme.typography.bodySmall,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant
+                        )
+                    }
+                    Switch(
+                        checked = offlineMode,
+                        onCheckedChange = { viewModel.setOfflineMode(it) }
+                    )
+                }
+            }
+            
+            Spacer(modifier = Modifier.height(16.dp))
+            
+            // ═══════════════════════════════════════════════════════════════
+            // Server Configuration (grayed out when offline mode)
+            // ═══════════════════════════════════════════════════════════════
+            
+            val fieldsEnabled = !offlineMode
+            val fieldsAlpha = if (offlineMode) 0.5f else 1f
+            
+            Column(modifier = Modifier.alpha(fieldsAlpha)) {
+                // Verbindungstyp
+                Text(
+                    text = stringResource(R.string.server_connection_type),
+                    style = MaterialTheme.typography.labelLarge,
+                    modifier = Modifier.padding(bottom = 8.dp)
+                )
+                
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.spacedBy(8.dp)
+                ) {
+                    FilterChip(
+                        selected = !isHttps,
+                        onClick = { viewModel.updateProtocol(false) },
+                        label = { Text(stringResource(R.string.server_connection_http)) },
+                        enabled = fieldsEnabled,
+                        modifier = Modifier.weight(1f)
+                    )
+                    FilterChip(
+                        selected = isHttps,
+                        onClick = { viewModel.updateProtocol(true) },
+                        label = { Text(stringResource(R.string.server_connection_https)) },
+                        enabled = fieldsEnabled,
+                        modifier = Modifier.weight(1f)
+                    )
+                }
+                
+                Text(
+                    text = if (!isHttps) {
+                        stringResource(R.string.server_connection_http_hint)
+                    } else {
+                        stringResource(R.string.server_connection_https_hint)
+                    },
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    modifier = Modifier.padding(top = 4.dp, bottom = 16.dp)
+                )
+                
+                // 🌟 v1.6.0: Server-Adresse with non-editable prefix
+                OutlinedTextField(
+                    value = serverHost,  // Only host part is editable
+                    onValueChange = { viewModel.updateServerHost(it) },
+                    label = { Text(stringResource(R.string.server_address)) },
+                    supportingText = { Text(stringResource(R.string.server_address_hint)) },
+                    prefix = {
+                        // Protocol prefix is displayed but not editable
+                        Text(
+                            text = if (isHttps) "https://" else "http://",
+                            style = MaterialTheme.typography.bodyLarge,
+                            color = if (fieldsEnabled) {
+                                MaterialTheme.colorScheme.onSurfaceVariant
+                            } else {
+                                MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f)
+                            }
+                        )
+                    },
+                    leadingIcon = { Icon(Icons.Default.Language, null) },
+                    modifier = Modifier.fillMaxWidth(),
+                    singleLine = true,
+                    enabled = fieldsEnabled,
+                    keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Uri)
+                )
+                
+                Spacer(modifier = Modifier.height(12.dp))
+                
+                // Benutzername
+                OutlinedTextField(
+                    value = username,
+                    onValueChange = { viewModel.updateUsername(it) },
+                    label = { Text(stringResource(R.string.username)) },
+                    leadingIcon = { Icon(Icons.Default.Person, null) },
+                    modifier = Modifier.fillMaxWidth(),
+                    singleLine = true,
+                    enabled = fieldsEnabled
+                )
+                
+                Spacer(modifier = Modifier.height(12.dp))
+                
+                // Passwort
+                OutlinedTextField(
+                    value = password,
+                    onValueChange = { viewModel.updatePassword(it) },
+                    label = { Text(stringResource(R.string.password)) },
+                    leadingIcon = { Icon(Icons.Default.Lock, null) },
+                    trailingIcon = {
+                        IconButton(onClick = { passwordVisible = !passwordVisible }) {
+                            Icon(
+                                imageVector = if (passwordVisible) {
+                                    Icons.Default.VisibilityOff
+                                } else {
+                                    Icons.Default.Visibility
+                                },
+                                contentDescription = if (passwordVisible) {
+                                    stringResource(R.string.server_password_hide)
+                                } else {
+                                    stringResource(R.string.server_password_show)
+                                }
+                            )
+                        }
+                    },
+                    visualTransformation = if (passwordVisible) {
+                        VisualTransformation.None
+                    } else {
+                        PasswordVisualTransformation()
+                    },
+                    modifier = Modifier.fillMaxWidth(),
+                    singleLine = true,
+                    enabled = fieldsEnabled,
+                    keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Password)
+                )
+            }
+            
+            Spacer(modifier = Modifier.height(16.dp))
+            
+            // Server-Status
+            Card(
+                modifier = Modifier.fillMaxWidth(),
+                colors = CardDefaults.cardColors(
+                    containerColor = MaterialTheme.colorScheme.surfaceContainerHighest
+                )
+            ) {
+                Row(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .padding(16.dp),
+                    horizontalArrangement = Arrangement.SpaceBetween,
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    Text(stringResource(R.string.server_status_label), style = MaterialTheme.typography.labelLarge)
+                    Text(
+                        text = when (serverStatus) {
+                            is SettingsViewModel.ServerStatus.OfflineMode -> stringResource(R.string.server_status_offline_mode)
+                            is SettingsViewModel.ServerStatus.Reachable -> stringResource(R.string.server_status_reachable)
+                            is SettingsViewModel.ServerStatus.Unreachable -> stringResource(R.string.server_status_unreachable)
+                            is SettingsViewModel.ServerStatus.Checking -> stringResource(R.string.server_status_checking)
+                            is SettingsViewModel.ServerStatus.NotConfigured -> stringResource(R.string.server_status_offline_mode)
+                            else -> stringResource(R.string.server_status_unknown)
+                        },
+                        color = when (serverStatus) {
+                            is SettingsViewModel.ServerStatus.OfflineMode -> MaterialTheme.colorScheme.tertiary
+                            is SettingsViewModel.ServerStatus.Reachable -> Color(0xFF4CAF50)
+                            is SettingsViewModel.ServerStatus.Unreachable -> Color(0xFFF44336)
+                            is SettingsViewModel.ServerStatus.NotConfigured -> MaterialTheme.colorScheme.tertiary
+                            else -> MaterialTheme.colorScheme.onSurfaceVariant
+                        }
+                    )
+                }
+            }
+            
+            Spacer(modifier = Modifier.height(24.dp))
+            
+            // Action Buttons (disabled in offline mode)
+            Row(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .alpha(fieldsAlpha),
+                horizontalArrangement = Arrangement.spacedBy(8.dp)
+            ) {
+                OutlinedButton(
+                    onClick = { viewModel.testConnection() },
+                    enabled = fieldsEnabled,
+                    modifier = Modifier.weight(1f)
+                ) {
+                    Text(stringResource(R.string.test_connection))
+                }
+                
+                Button(
+                    onClick = { viewModel.syncNow() },
+                    enabled = fieldsEnabled && !isSyncing,
+                    modifier = Modifier.weight(1f)
+                ) {
+                    if (isSyncing) {
+                        CircularProgressIndicator(
+                            modifier = Modifier.size(16.dp),
+                            strokeWidth = 2.dp,
+                            color = MaterialTheme.colorScheme.onPrimary
+                        )
+                        Spacer(modifier = Modifier.width(8.dp))
+                    }
+                    Text(stringResource(R.string.sync_now))
+                }
+            }
+        }
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/screens/SettingsMainScreen.kt

@@ -0,0 +1,237 @@
+package dev.dettmer.simplenotes.ui.settings.screens
+
+import androidx.appcompat.app.AppCompatDelegate
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Backup
+import androidx.compose.material.icons.filled.BugReport
+import androidx.compose.material.icons.filled.Cloud
+import androidx.compose.material.icons.filled.Description
+import androidx.compose.material.icons.filled.GridView
+import androidx.compose.material.icons.filled.Info
+import androidx.compose.material.icons.filled.Language
+import androidx.compose.material.icons.filled.Sync
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.BuildConfig
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.ui.settings.SettingsRoute
+import dev.dettmer.simplenotes.ui.settings.SettingsViewModel
+import dev.dettmer.simplenotes.ui.settings.components.SettingsCard
+import dev.dettmer.simplenotes.ui.settings.components.SettingsScaffold
+
+/**
+ * Main Settings overview screen with clickable group cards
+ * v1.5.0: Jetpack Compose Settings Redesign
+ */
+@Suppress("MagicNumber") // Color hex values
+@Composable
+fun SettingsMainScreen(
+    viewModel: SettingsViewModel,
+    onNavigate: (SettingsRoute) -> Unit,
+    onBack: () -> Unit
+) {
+    val serverUrl by viewModel.serverUrl.collectAsState()
+    val serverStatus by viewModel.serverStatus.collectAsState()
+    val autoSyncEnabled by viewModel.autoSyncEnabled.collectAsState()
+    val syncInterval by viewModel.syncInterval.collectAsState()
+    val markdownAutoSync by viewModel.markdownAutoSync.collectAsState()
+    val fileLoggingEnabled by viewModel.fileLoggingEnabled.collectAsState()
+    
+    // 🌟 v1.6.0: Collect offline mode and trigger states
+    val offlineMode by viewModel.offlineMode.collectAsState()
+    val triggerOnSave by viewModel.triggerOnSave.collectAsState()
+    val triggerOnResume by viewModel.triggerOnResume.collectAsState()
+    val triggerWifiConnect by viewModel.triggerWifiConnect.collectAsState()
+    val triggerPeriodic by viewModel.triggerPeriodic.collectAsState()
+    val triggerBoot by viewModel.triggerBoot.collectAsState()
+    
+    // Check server status on first load
+    LaunchedEffect(Unit) {
+        viewModel.checkServerStatus()
+    }
+    
+    // Get current language for display (no remember - always fresh value after activity recreate)
+    val locales = AppCompatDelegate.getApplicationLocales()
+    val currentLanguageName = if (locales.isEmpty) {
+        null // System default
+    } else {
+        locales[0]?.displayLanguage?.replaceFirstChar { it.uppercase() }
+    }
+    val systemDefaultText = stringResource(R.string.language_system_default)
+    val languageSubtitle = currentLanguageName ?: systemDefaultText
+    
+    SettingsScaffold(
+        title = stringResource(R.string.settings_title),
+        onBack = onBack
+    ) { paddingValues ->
+        LazyColumn(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(paddingValues),
+            contentPadding = PaddingValues(vertical = 8.dp)
+        ) {
+            // Language Settings
+            item {
+                SettingsCard(
+                    icon = Icons.Default.Language,
+                    title = stringResource(R.string.settings_language),
+                    subtitle = languageSubtitle,
+                    onClick = { onNavigate(SettingsRoute.Language) }
+                )
+            }
+            
+            // 🎨 v1.7.0: Display Settings
+            item {
+                val displayMode by viewModel.displayMode.collectAsState()
+                val displaySubtitle = when (displayMode) {
+                    "grid" -> stringResource(R.string.display_mode_grid)
+                    else -> stringResource(R.string.display_mode_list)
+                }
+                
+                SettingsCard(
+                    icon = Icons.Default.GridView,
+                    title = stringResource(R.string.display_settings_title),
+                    subtitle = displaySubtitle,
+                    onClick = { onNavigate(SettingsRoute.Display) }
+                )
+            }
+            
+            // Server-Einstellungen
+            item {
+                // 🌟 v1.6.0: Check if server is configured (host is not empty)
+                val isConfigured = serverUrl.isNotEmpty()
+                
+                SettingsCard(
+                    icon = Icons.Default.Cloud,
+                    title = stringResource(R.string.settings_server),
+                    subtitle = if (!offlineMode && isConfigured) serverUrl else null,
+                    statusText = when {
+                        offlineMode -> 
+                            stringResource(R.string.settings_server_status_offline_mode)
+                        serverStatus is SettingsViewModel.ServerStatus.OfflineMode -> 
+                            stringResource(R.string.settings_server_status_offline_mode)
+                        serverStatus is SettingsViewModel.ServerStatus.Reachable -> 
+                            stringResource(R.string.settings_server_status_reachable)
+                        serverStatus is SettingsViewModel.ServerStatus.Unreachable -> 
+                            stringResource(R.string.settings_server_status_unreachable)
+                        serverStatus is SettingsViewModel.ServerStatus.Checking -> 
+                            stringResource(R.string.settings_server_status_checking)
+                        serverStatus is SettingsViewModel.ServerStatus.NotConfigured -> 
+                            stringResource(R.string.settings_server_status_offline_mode)
+                        else -> null
+                    },
+                    statusColor = when {
+                        offlineMode -> MaterialTheme.colorScheme.tertiary
+                        serverStatus is SettingsViewModel.ServerStatus.OfflineMode -> 
+                            MaterialTheme.colorScheme.tertiary
+                        serverStatus is SettingsViewModel.ServerStatus.Reachable -> 
+                            Color(0xFF4CAF50)
+                        serverStatus is SettingsViewModel.ServerStatus.Unreachable -> 
+                            Color(0xFFF44336)
+                        serverStatus is SettingsViewModel.ServerStatus.NotConfigured -> 
+                            MaterialTheme.colorScheme.tertiary
+                        else -> Color.Gray
+                    },
+                    onClick = { onNavigate(SettingsRoute.Server) }
+                )
+            }
+            
+            // Sync-Einstellungen
+            item {
+                // 🌟 v1.6.0: Build dynamic subtitle based on active triggers
+                val isServerConfigured = viewModel.isServerConfigured()
+                val activeTriggersCount = listOf(
+                    triggerOnSave,
+                    triggerOnResume,
+                    triggerWifiConnect,
+                    triggerPeriodic,
+                    triggerBoot
+                ).count { it }
+                
+                // 🌟 v1.6.0 Fix: Use statusText for offline mode (consistent with Server card)
+                val syncSubtitle = if (isServerConfigured) {
+                    if (activeTriggersCount == 0) {
+                        stringResource(R.string.settings_sync_manual_only)
+                    } else {
+                        stringResource(R.string.settings_sync_triggers_active, activeTriggersCount)
+                    }
+                } else null
+                
+                SettingsCard(
+                    icon = Icons.Default.Sync,
+                    title = stringResource(R.string.settings_sync),
+                    subtitle = syncSubtitle,
+                    statusText = if (!isServerConfigured) stringResource(R.string.settings_sync_offline_mode) else null,
+                    statusColor = if (!isServerConfigured) MaterialTheme.colorScheme.tertiary else Color.Gray,
+                    onClick = { onNavigate(SettingsRoute.Sync) }
+                )
+            }
+            
+            // Markdown-Integration
+            item {
+                // 🌟 v1.6.0 Fix: Use statusText for offline mode (consistent with Server card)
+                val isServerConfiguredForMarkdown = viewModel.isServerConfigured()
+                
+                SettingsCard(
+                    icon = Icons.Default.Description,
+                    title = stringResource(R.string.settings_markdown),
+                    subtitle = if (isServerConfiguredForMarkdown) {
+                        if (markdownAutoSync) {
+                            stringResource(R.string.settings_markdown_auto_on)
+                        } else {
+                            stringResource(R.string.settings_markdown_auto_off)
+                        }
+                    } else null,
+                    statusText = if (!isServerConfiguredForMarkdown) stringResource(R.string.settings_sync_offline_mode) else null,
+                    statusColor = if (!isServerConfiguredForMarkdown) MaterialTheme.colorScheme.tertiary else Color.Gray,
+                    onClick = { onNavigate(SettingsRoute.Markdown) }
+                )
+            }
+            
+            // Backup & Wiederherstellung
+            item {
+                SettingsCard(
+                    icon = Icons.Default.Backup,
+                    title = stringResource(R.string.settings_backup),
+                    subtitle = stringResource(R.string.settings_backup_subtitle),
+                    onClick = { onNavigate(SettingsRoute.Backup) }
+                )
+            }
+            
+            // Über diese App
+            item {
+                SettingsCard(
+                    icon = Icons.Default.Info,
+                    title = stringResource(R.string.settings_about),
+                    subtitle = stringResource(R.string.about_version, BuildConfig.VERSION_NAME, BuildConfig.VERSION_CODE),
+                    onClick = { onNavigate(SettingsRoute.About) }
+                )
+            }
+            
+            // Debug & Diagnose
+            item {
+                SettingsCard(
+                    icon = Icons.Default.BugReport,
+                    title = stringResource(R.string.settings_debug),
+                    subtitle = if (fileLoggingEnabled) {
+                        stringResource(R.string.settings_debug_logging_on)
+                    } else {
+                        stringResource(R.string.settings_debug_logging_off)
+                    },
+                    onClick = { onNavigate(SettingsRoute.Debug) }
+                )
+            }
+        }
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/settings/screens/SyncSettingsScreen.kt

@@ -0,0 +1,232 @@
+package dev.dettmer.simplenotes.ui.settings.screens
+
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.PhonelinkRing
+import androidx.compose.material.icons.filled.Save
+import androidx.compose.material.icons.filled.Schedule
+import androidx.compose.material.icons.filled.SettingsInputAntenna
+import androidx.compose.material.icons.filled.Wifi
+import androidx.compose.material3.Button
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import dev.dettmer.simplenotes.R
+import dev.dettmer.simplenotes.ui.settings.SettingsViewModel
+import dev.dettmer.simplenotes.ui.settings.components.RadioOption
+import dev.dettmer.simplenotes.ui.settings.components.SettingsDivider
+import dev.dettmer.simplenotes.ui.settings.components.SettingsInfoCard
+import dev.dettmer.simplenotes.ui.settings.components.SettingsRadioGroup
+import dev.dettmer.simplenotes.ui.settings.components.SettingsScaffold
+import dev.dettmer.simplenotes.ui.settings.components.SettingsSectionHeader
+import dev.dettmer.simplenotes.ui.settings.components.SettingsSwitch
+
+/**
+ * Sync settings screen - Configurable Sync Triggers
+ * v1.5.0: Jetpack Compose Settings Redesign
+ * v1.6.0: Individual toggle for each sync trigger (onSave, onResume, WiFi-Connect, Periodic, Boot)
+ */
+@Composable
+fun SyncSettingsScreen(
+    viewModel: SettingsViewModel,
+    onBack: () -> Unit,
+    onNavigateToServerSettings: () -> Unit
+) {
+    // Collect all trigger states
+    val triggerOnSave by viewModel.triggerOnSave.collectAsState()
+    val triggerOnResume by viewModel.triggerOnResume.collectAsState()
+    val triggerWifiConnect by viewModel.triggerWifiConnect.collectAsState()
+    val triggerPeriodic by viewModel.triggerPeriodic.collectAsState()
+    val triggerBoot by viewModel.triggerBoot.collectAsState()
+    val syncInterval by viewModel.syncInterval.collectAsState()
+    
+    // 🆕 v1.7.0: WiFi-only sync
+    val wifiOnlySync by viewModel.wifiOnlySync.collectAsState()
+    
+    // Check if server is configured
+    val isServerConfigured = viewModel.isServerConfigured()
+    
+    SettingsScaffold(
+        title = stringResource(R.string.sync_settings_title),
+        onBack = onBack
+    ) { paddingValues ->
+        Column(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(paddingValues)
+                .verticalScroll(rememberScrollState())
+        ) {
+            Spacer(modifier = Modifier.height(8.dp))
+            
+            // 🌟 v1.6.0: Offline Mode Warning if server not configured
+            if (!isServerConfigured) {
+                SettingsInfoCard(
+                    text = stringResource(R.string.sync_offline_mode_message),
+                    isWarning = true
+                )
+                
+                Button(
+                    onClick = onNavigateToServerSettings,
+                    modifier = Modifier.padding(horizontal = 16.dp, vertical = 8.dp)
+                ) {
+                    Text(stringResource(R.string.sync_offline_mode_button))
+                }
+                
+                Spacer(modifier = Modifier.height(8.dp))
+            }
+            
+            // ═══════════════════════════════════════════════════════════════
+            // 🆕 v1.7.0: NETZWERK-EINSCHRÄNKUNG Section (Global für alle Trigger)
+            // ═══════════════════════════════════════════════════════════════
+            
+            SettingsSectionHeader(text = stringResource(R.string.sync_section_network))
+            
+            // WiFi-Only Sync Toggle - Gilt für ALLE Trigger außer WiFi-Connect
+            SettingsSwitch(
+                title = stringResource(R.string.sync_wifi_only_title),
+                subtitle = stringResource(R.string.sync_wifi_only_subtitle),
+                checked = wifiOnlySync,
+                onCheckedChange = { viewModel.setWifiOnlySync(it) },
+                icon = Icons.Default.Wifi,
+                enabled = isServerConfigured
+            )
+            
+            // Info-Hinweis dass WiFi-Connect davon ausgenommen ist
+            if (wifiOnlySync && isServerConfigured) {
+                SettingsInfoCard(
+                    text = stringResource(R.string.sync_wifi_only_hint)
+                )
+            }
+            
+            SettingsDivider()
+            
+            // ═══════════════════════════════════════════════════════════════
+            // SOFORT-SYNC Section
+            // ═══════════════════════════════════════════════════════════════
+            
+            SettingsSectionHeader(text = stringResource(R.string.sync_section_instant))
+            
+            // onSave Trigger
+            SettingsSwitch(
+                title = stringResource(R.string.sync_trigger_on_save_title),
+                subtitle = stringResource(R.string.sync_trigger_on_save_subtitle),
+                checked = triggerOnSave,
+                onCheckedChange = { viewModel.setTriggerOnSave(it) },
+                icon = Icons.Default.Save,
+                enabled = isServerConfigured
+            )
+            
+            // onResume Trigger
+            SettingsSwitch(
+                title = stringResource(R.string.sync_trigger_on_resume_title),
+                subtitle = stringResource(R.string.sync_trigger_on_resume_subtitle),
+                checked = triggerOnResume,
+                onCheckedChange = { viewModel.setTriggerOnResume(it) },
+                icon = Icons.Default.PhonelinkRing,
+                enabled = isServerConfigured
+            )
+            
+            SettingsDivider()
+            
+            // ═══════════════════════════════════════════════════════════════
+            // HINTERGRUND-SYNC Section
+            // ═══════════════════════════════════════════════════════════════
+            
+            SettingsSectionHeader(text = stringResource(R.string.sync_section_background))
+            
+            // WiFi-Connect Trigger
+            SettingsSwitch(
+                title = stringResource(R.string.sync_trigger_wifi_connect_title),
+                subtitle = stringResource(R.string.sync_trigger_wifi_connect_subtitle),
+                checked = triggerWifiConnect,
+                onCheckedChange = { viewModel.setTriggerWifiConnect(it) },
+                icon = Icons.Default.Wifi,
+                enabled = isServerConfigured
+            )
+            
+            // Periodic Trigger
+            SettingsSwitch(
+                title = stringResource(R.string.sync_trigger_periodic_title),
+                subtitle = stringResource(R.string.sync_trigger_periodic_subtitle),
+                checked = triggerPeriodic,
+                onCheckedChange = { viewModel.setTriggerPeriodic(it) },
+                icon = Icons.Default.Schedule,
+                enabled = isServerConfigured
+            )
+            
+            // Periodic Interval Selection (only visible if periodic trigger is enabled)
+            if (triggerPeriodic && isServerConfigured) {
+                Spacer(modifier = Modifier.height(8.dp))
+                
+                val intervalOptions = listOf(
+                    RadioOption(
+                        value = 15L,
+                        title = stringResource(R.string.sync_interval_15min_title),
+                        subtitle = null
+                    ),
+                    RadioOption(
+                        value = 30L,
+                        title = stringResource(R.string.sync_interval_30min_title),
+                        subtitle = null
+                    ),
+                    RadioOption(
+                        value = 60L,
+                        title = stringResource(R.string.sync_interval_60min_title),
+                        subtitle = null
+                    )
+                )
+                
+                SettingsRadioGroup(
+                    options = intervalOptions,
+                    selectedValue = syncInterval,
+                    onValueSelected = { viewModel.setSyncInterval(it) }
+                )
+                
+                Spacer(modifier = Modifier.height(8.dp))
+            }
+            
+            SettingsDivider()
+            
+            // ═══════════════════════════════════════════════════════════════
+            // ADVANCED Section (Boot Sync)
+            // ═══════════════════════════════════════════════════════════════
+            
+            SettingsSectionHeader(text = stringResource(R.string.sync_section_advanced))
+            
+            // Boot Trigger
+            SettingsSwitch(
+                title = stringResource(R.string.sync_trigger_boot_title),
+                subtitle = stringResource(R.string.sync_trigger_boot_subtitle),
+                checked = triggerBoot,
+                onCheckedChange = { viewModel.setTriggerBoot(it) },
+                icon = Icons.Default.SettingsInputAntenna,
+                enabled = isServerConfigured
+            )
+            
+            SettingsDivider()
+            
+            // Manual Sync Info
+            val manualHintText = if (isServerConfigured) {
+                stringResource(R.string.sync_manual_hint)
+            } else {
+                stringResource(R.string.sync_manual_hint_disabled)
+            }
+            
+            SettingsInfoCard(
+                text = manualHintText
+            )
+            
+            Spacer(modifier = Modifier.height(16.dp))
+        }
+    }
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/theme/Dimensions.kt

@@ -0,0 +1,28 @@
+package dev.dettmer.simplenotes.ui.theme
+
+import androidx.compose.ui.unit.dp
+
+/**
+ * Zentrale UI-Dimensionen für konsistentes Design
+ */
+object Dimensions {
+    // Padding & Spacing
+    val SpacingSmall = 4.dp
+    val SpacingMedium = 8.dp
+    val SpacingLarge = 16.dp
+    val SpacingXLarge = 24.dp
+    
+    // Icon Sizes
+    val IconSizeSmall = 16.dp
+    val IconSizeMedium = 24.dp
+    val IconSizeLarge = 32.dp
+    
+    // Minimum Touch Target (Material Design: 48dp)
+    val MinTouchTarget = 48.dp
+    
+    // Checklist
+    val ChecklistItemMinHeight = 48.dp
+    
+    // Status Bar Heights
+    val StatusBarHeightDefault = 56.dp
+}

android/app/src/main/java/dev/dettmer/simplenotes/ui/theme/SimpleNotesTheme.kt

@@ -0,0 +1,47 @@
+package dev.dettmer.simplenotes.ui.theme
+
+import android.os.Build
+import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.darkColorScheme
+import androidx.compose.material3.dynamicDarkColorScheme
+import androidx.compose.material3.dynamicLightColorScheme
+import androidx.compose.material3.lightColorScheme
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.platform.LocalContext
+
+/**
+ * Shared Material 3 Theme with Dynamic Colors (Material You) support
+ * v1.5.0: Unified theme for MainActivity and Settings
+ * 
+ * Used by:
+ * - ComposeMainActivity (Notes list)
+ * - ComposeSettingsActivity (Settings screens)
+ */
+@Composable
+fun SimpleNotesTheme(
+    darkTheme: Boolean = isSystemInDarkTheme(),
+    dynamicColor: Boolean = true,
+    content: @Composable () -> Unit
+) {
+    val context = LocalContext.current
+    
+    val colorScheme = when {
+        // Dynamic colors are available on Android 12+
+        dynamicColor && Build.VERSION.SDK_INT >= Build.VERSION_CODES.S -> {
+            if (darkTheme) {
+                dynamicDarkColorScheme(context)
+            } else {
+                dynamicLightColorScheme(context)
+            }
+        }
+        // Fallback to static Material 3 colors
+        darkTheme -> darkColorScheme()
+        else -> lightColorScheme()
+    }
+    
+    MaterialTheme(
+        colorScheme = colorScheme,
+        content = content
+    )
+}

android/app/src/main/java/dev/dettmer/simplenotes/utils/Constants.kt

@@ -6,14 +6,54 @@ object Constants {
     const val KEY_SERVER_URL = "server_url"
     const val KEY_USERNAME = "username"
     const val KEY_PASSWORD = "password"
-    const val KEY_HOME_SSID = "home_ssid"
     const val KEY_AUTO_SYNC = "auto_sync_enabled"
     const val KEY_LAST_SYNC = "last_sync_timestamp"
     
+    // 🔥 v1.1.2: Last Successful Sync Monitoring
+    const val KEY_LAST_SUCCESSFUL_SYNC = "last_successful_sync_time"
+    const val KEY_LAST_SYNC_WARNING_SHOWN = "last_sync_warning_shown_time"
+    const val SYNC_WARNING_THRESHOLD_MS = 24 * 60 * 60 * 1000L  // 24h
+    
     // 🔥 NEU: Sync Interval Configuration
     const val PREF_SYNC_INTERVAL_MINUTES = "sync_interval_minutes"
     const val DEFAULT_SYNC_INTERVAL_MINUTES = 30L
     
+    // 🔥 v1.2.0: Markdown Export/Import
+    const val KEY_MARKDOWN_EXPORT = "markdown_export_enabled"
+    const val KEY_MARKDOWN_AUTO_IMPORT = "markdown_auto_import_enabled"
+    
+    // 🔥 v1.3.0: Performance & Multi-Device Sync
+    const val KEY_ALWAYS_CHECK_SERVER = "always_check_server"
+    const val KEY_ALWAYS_DELETE_FROM_SERVER = "always_delete_from_server"
+    
+    // 🔥 v1.3.1: Debug & Logging
+    const val KEY_FILE_LOGGING_ENABLED = "file_logging_enabled"
+    
+    // 🔥 v1.6.0: Offline Mode Toggle
+    const val KEY_OFFLINE_MODE = "offline_mode_enabled"
+    
+    // 🔥 v1.7.0: WiFi-Only Sync Toggle
+    const val KEY_WIFI_ONLY_SYNC = "wifi_only_sync_enabled"
+    const val DEFAULT_WIFI_ONLY_SYNC = false  // Standardmäßig auch mobil syncen
+    
+    // 🔥 v1.6.0: Configurable Sync Triggers
+    const val KEY_SYNC_TRIGGER_ON_SAVE = "sync_trigger_on_save"
+    const val KEY_SYNC_TRIGGER_ON_RESUME = "sync_trigger_on_resume"
+    const val KEY_SYNC_TRIGGER_WIFI_CONNECT = "sync_trigger_wifi_connect"
+    const val KEY_SYNC_TRIGGER_PERIODIC = "sync_trigger_periodic"
+    const val KEY_SYNC_TRIGGER_BOOT = "sync_trigger_boot"
+    
+    // Sync Trigger Defaults (active after server configuration)
+    const val DEFAULT_TRIGGER_ON_SAVE = true
+    const val DEFAULT_TRIGGER_ON_RESUME = true
+    const val DEFAULT_TRIGGER_WIFI_CONNECT = true
+    const val DEFAULT_TRIGGER_PERIODIC = false
+    const val DEFAULT_TRIGGER_BOOT = false
+    
+    // Throttling for onSave sync (5 seconds)
+    const val MIN_ON_SAVE_SYNC_INTERVAL_MS = 5_000L
+    const val PREF_LAST_ON_SAVE_SYNC_TIME = "last_on_save_sync_time"
+    
     // WorkManager
     const val SYNC_WORK_TAG = "notes_sync"
     const val SYNC_DELAY_SECONDS = 5L
@@ -21,4 +61,10 @@ object Constants {
     // Notifications
     const val NOTIFICATION_CHANNEL_ID = "notes_sync_channel"
     const val NOTIFICATION_ID = 1001
+    
+    // 🎨 v1.7.0: Staggered Grid Layout
+    const val KEY_DISPLAY_MODE = "display_mode" // "list" or "grid"
+    const val DEFAULT_DISPLAY_MODE = "list"
+    const val GRID_COLUMNS = 2
+    const val GRID_SPACING_DP = 8
 }

android/app/src/main/java/dev/dettmer/simplenotes/utils/Extensions.kt

@@ -2,17 +2,21 @@ package dev.dettmer.simplenotes.utils
 
 import android.content.Context
 import android.widget.Toast
+import dev.dettmer.simplenotes.R
 import java.text.SimpleDateFormat
 import java.util.Date
 import java.util.Locale
 import java.util.concurrent.TimeUnit
 
+private const val DAYS_THRESHOLD = 7L
+private const val TRUNCATE_SUFFIX_LENGTH = 3
+
 // Toast Extensions
 fun Context.showToast(message: String, duration: Int = Toast.LENGTH_SHORT) {
     Toast.makeText(this, message, duration).show()
 }
 
-// Timestamp to readable format
+// Timestamp to readable format (legacy - without context, uses German)
 fun Long.toReadableTime(): String {
     val now = System.currentTimeMillis()
     val diff = now - this
@@ -27,7 +31,7 @@ fun Long.toReadableTime(): String {
             val hours = TimeUnit.MILLISECONDS.toHours(diff)
             "Vor $hours Std"
         }
-        diff < TimeUnit.DAYS.toMillis(7) -> {
+        diff < TimeUnit.DAYS.toMillis(DAYS_THRESHOLD) -> {
             val days = TimeUnit.MILLISECONDS.toDays(diff)
             "Vor $days Tagen"
         }
@@ -38,10 +42,36 @@ fun Long.toReadableTime(): String {
     }
 }
 
+// Timestamp to readable format (with context for i18n)
+fun Long.toReadableTime(context: Context): String {
+    val now = System.currentTimeMillis()
+    val diff = now - this
+    
+    return when {
+        diff < TimeUnit.MINUTES.toMillis(1) -> context.getString(R.string.time_just_now)
+        diff < TimeUnit.HOURS.toMillis(1) -> {
+            val minutes = TimeUnit.MILLISECONDS.toMinutes(diff).toInt()
+            context.getString(R.string.time_minutes_ago, minutes)
+        }
+        diff < TimeUnit.DAYS.toMillis(1) -> {
+            val hours = TimeUnit.MILLISECONDS.toHours(diff).toInt()
+            context.getString(R.string.time_hours_ago, hours)
+        }
+        diff < TimeUnit.DAYS.toMillis(DAYS_THRESHOLD) -> {
+            val days = TimeUnit.MILLISECONDS.toDays(diff).toInt()
+            context.getString(R.string.time_days_ago, days)
+        }
+        else -> {
+            val sdf = SimpleDateFormat("dd.MM.yyyy", Locale.getDefault())
+            sdf.format(Date(this))
+        }
+    }
+}
+
 // Truncate long strings
 fun String.truncate(maxLength: Int): String {
     return if (length > maxLength) {
-        substring(0, maxLength - 3) + "..."
+        substring(0, maxLength - TRUNCATE_SUFFIX_LENGTH) + "..."
     } else {
         this
     }

android/app/src/main/java/dev/dettmer/simplenotes/utils/Logger.kt

@@ -5,7 +5,6 @@ import android.util.Log
 import dev.dettmer.simplenotes.BuildConfig
 import java.io.File
 import java.io.FileWriter
-import java.io.PrintWriter
 import java.text.SimpleDateFormat
 import java.util.*
 
@@ -15,10 +14,34 @@ import java.util.*
  */
 object Logger {
     
+    private const val MAX_LOG_ENTRIES = 500 // Nur letzte 500 Einträge
+    
     private var fileLoggingEnabled = false
     private var logFile: File? = null
+    private var appContext: Context? = null
     private val dateFormat = SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS", Locale.getDefault())
-    private val maxLogEntries = 500 // Nur letzte 500 Einträge
+    
+    /**
+     * Setzt den File-Logging Status (für UI Toggle)
+     */
+    fun setFileLoggingEnabled(enabled: Boolean) {
+        fileLoggingEnabled = enabled
+        if (!enabled) {
+            logFile = null
+        }
+    }
+    
+    /**
+     * Gibt zurück, ob File-Logging aktiviert ist
+     */
+    fun isFileLoggingEnabled(): Boolean = fileLoggingEnabled
+    
+    /**
+     * Initialisiert den Logger mit App-Context
+     */
+    fun init(context: Context) {
+        appContext = context.applicationContext
+    }
     
     /**
      * Aktiviert File-Logging für Debugging
@@ -50,11 +73,47 @@ object Logger {
      */
     fun getLogFile(): File? = logFile
     
+    /**
+     * Gibt Log-Datei mit Context zurück (für SettingsActivity)
+     */
+    fun getLogFile(context: Context): File? {
+        if (logFile == null && fileLoggingEnabled) {
+            logFile = File(context.filesDir, "simplenotes_debug.log")
+        }
+        return logFile
+    }
+    
+    /**
+     * Löscht die Log-Datei
+     */
+    fun clearLogFile(context: Context): Boolean {
+        return try {
+            val file = File(context.filesDir, "simplenotes_debug.log")
+            if (file.exists()) {
+                file.delete()
+                logFile = null
+                true
+            } else {
+                false
+            }
+        } catch (e: Exception) {
+            Log.e("Logger", "Failed to clear log file", e)
+            false
+        }
+    }
+    
     /**
      * Schreibt Log-Eintrag in Datei
      */
     private fun writeToFile(level: String, tag: String, message: String, throwable: Throwable? = null) {
-        if (!fileLoggingEnabled || logFile == null) return
+        if (!fileLoggingEnabled) return
+        
+        // Lazy-init logFile mit appContext
+        if (logFile == null && appContext != null) {
+            logFile = File(appContext!!.filesDir, "simplenotes_debug.log")
+        }
+        
+        if (logFile == null) return
         
         try {
             val timestamp = dateFormat.format(Date())
@@ -80,13 +139,13 @@ object Logger {
     }
     
     /**
-     * Begrenzt Log-Datei auf maxLogEntries
+     * Begrenzt Log-Datei auf MAX_LOG_ENTRIES
      */
     private fun trimLogFile() {
         try {
             val lines = logFile?.readLines() ?: return
-            if (lines.size > maxLogEntries) {
-                val trimmed = lines.takeLast(maxLogEntries)
+            if (lines.size > MAX_LOG_ENTRIES) {
+                val trimmed = lines.takeLast(MAX_LOG_ENTRIES)
                 logFile?.writeText(trimmed.joinToString("\n") + "\n")
             }
         } catch (e: Exception) {

android/app/src/main/java/dev/dettmer/simplenotes/utils/NotificationHelper.kt

@@ -2,21 +2,25 @@ package dev.dettmer.simplenotes.utils
 
 import android.app.NotificationChannel
 import android.app.NotificationManager
+import dev.dettmer.simplenotes.R
 import android.app.PendingIntent
 import android.content.Context
 import android.content.Intent
 import android.os.Build
+import android.os.Handler
+import android.os.Looper
 import androidx.core.app.NotificationCompat
 import androidx.core.app.NotificationManagerCompat
-import dev.dettmer.simplenotes.MainActivity
+import dev.dettmer.simplenotes.ui.main.ComposeMainActivity
 
 object NotificationHelper {
     
+    private const val TAG = "NotificationHelper"
     private const val CHANNEL_ID = "notes_sync_channel"
-    private const val CHANNEL_NAME = "Notizen Synchronisierung"
-    private const val CHANNEL_DESCRIPTION = "Benachrichtigungen über Sync-Status"
     private const val NOTIFICATION_ID = 1001
     private const val SYNC_NOTIFICATION_ID = 2
+    const val SYNC_PROGRESS_NOTIFICATION_ID = 1003  // v1.7.2: For expedited work foreground notification
+    private const val AUTO_CANCEL_TIMEOUT_MS = 30_000L
     
     /**
      * Erstellt Notification Channel (Android 8.0+)
@@ -25,9 +29,11 @@ object NotificationHelper {
     fun createNotificationChannel(context: Context) {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
             val importance = NotificationManager.IMPORTANCE_DEFAULT
+            val channelName = context.getString(R.string.notification_channel_name)
+            val channelDescription = context.getString(R.string.notification_channel_desc)
             
-            val channel = NotificationChannel(CHANNEL_ID, CHANNEL_NAME, importance).apply {
-                description = CHANNEL_DESCRIPTION
+            val channel = NotificationChannel(CHANNEL_ID, channelName, importance).apply {
+                description = channelDescription
                 enableVibration(true)
                 enableLights(true)
             }
@@ -38,11 +44,42 @@ object NotificationHelper {
         }
     }
     
+    /**
+     * Löscht alle Sync-Notifications
+     * Sollte beim App-Start aufgerufen werden um alte Notifications zu entfernen
+     */
+    fun clearSyncNotifications(context: Context) {
+        val manager = context.getSystemService(Context.NOTIFICATION_SERVICE) 
+            as NotificationManager
+        manager.cancel(SYNC_NOTIFICATION_ID)
+        Logger.d(TAG, "🗑️ Cleared old sync notifications")
+    }
+    
+    /**
+     * 🔧 v1.7.2: Erstellt Notification für Sync-Progress (Expedited Work)
+     * 
+     * Wird von SyncWorker.getForegroundInfo() aufgerufen auf Android 9-11.
+     * Muss eine gültige, sichtbare Notification zurückgeben.
+     * 
+     * @return Notification (nicht anzeigen, nur erstellen)
+     */
+    fun createSyncProgressNotification(context: Context): android.app.Notification {
+        return NotificationCompat.Builder(context, CHANNEL_ID)
+            .setSmallIcon(android.R.drawable.stat_notify_sync)
+            .setContentTitle(context.getString(R.string.sync_in_progress))
+            .setContentText(context.getString(R.string.sync_in_progress_text))
+            .setPriority(NotificationCompat.PRIORITY_LOW)
+            .setOngoing(true)
+            .setProgress(0, 0, true)  // Indeterminate progress
+            .setCategory(NotificationCompat.CATEGORY_PROGRESS)
+            .build()
+    }
+    
     /**
      * Zeigt Erfolgs-Notification nach Sync
      */
     fun showSyncSuccessNotification(context: Context, syncedCount: Int) {
-        val intent = Intent(context, MainActivity::class.java).apply {
+        val intent = Intent(context, ComposeMainActivity::class.java).apply {
             flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
         }
         
@@ -53,8 +90,8 @@ object NotificationHelper {
         
         val notification = NotificationCompat.Builder(context, CHANNEL_ID)
             .setSmallIcon(android.R.drawable.ic_menu_upload)
-            .setContentTitle("Sync erfolgreich")
-            .setContentText("$syncedCount Notiz(en) synchronisiert")
+            .setContentTitle(context.getString(R.string.notification_sync_success_title))
+            .setContentText(context.getString(R.string.notification_sync_success_message, syncedCount))
             .setPriority(NotificationCompat.PRIORITY_DEFAULT)
             .setContentIntent(pendingIntent)
             .setAutoCancel(true)
@@ -81,7 +118,7 @@ object NotificationHelper {
     fun showSyncFailureNotification(context: Context, errorMessage: String) {
         val notification = NotificationCompat.Builder(context, CHANNEL_ID)
             .setSmallIcon(android.R.drawable.ic_dialog_alert)
-            .setContentTitle("Sync fehlgeschlagen")
+            .setContentTitle(context.getString(R.string.notification_sync_failed_title))
             .setContentText(errorMessage)
             .setStyle(NotificationCompat.BigTextStyle()
                 .bigText(errorMessage))
@@ -110,8 +147,8 @@ object NotificationHelper {
     fun showSyncProgressNotification(context: Context): Int {
         val notification = NotificationCompat.Builder(context, CHANNEL_ID)
             .setSmallIcon(android.R.drawable.ic_popup_sync)
-            .setContentTitle("Synchronisiere...")
-            .setContentText("Notizen werden synchronisiert")
+            .setContentTitle(context.getString(R.string.notification_sync_progress_title))
+            .setContentText(context.getString(R.string.notification_sync_progress_message))
             .setPriority(NotificationCompat.PRIORITY_LOW)
             .setOngoing(true)
             .setProgress(0, 0, true)
@@ -138,7 +175,7 @@ object NotificationHelper {
      * Zeigt Notification bei erkanntem Konflikt
      */
     fun showConflictNotification(context: Context, conflictCount: Int) {
-        val intent = Intent(context, MainActivity::class.java)
+        val intent = Intent(context, ComposeMainActivity::class.java)
         val pendingIntent = PendingIntent.getActivity(
             context, 0, intent,
             PendingIntent.FLAG_IMMUTABLE or PendingIntent.FLAG_UPDATE_CURRENT
@@ -146,8 +183,8 @@ object NotificationHelper {
         
         val notification = NotificationCompat.Builder(context, CHANNEL_ID)
             .setSmallIcon(android.R.drawable.ic_dialog_info)
-            .setContentTitle("Sync-Konflikt erkannt")
-            .setContentText("$conflictCount Notiz(en) haben Konflikte")
+            .setContentTitle(context.getString(R.string.notification_sync_conflict_title))
+            .setContentText(context.getString(R.string.notification_sync_conflict_message, conflictCount))
             .setPriority(NotificationCompat.PRIORITY_HIGH)
             .setContentIntent(pendingIntent)
             .setAutoCancel(true)
@@ -197,8 +234,8 @@ object NotificationHelper {
     fun showSyncInProgress(context: Context) {
         val notification = NotificationCompat.Builder(context, CHANNEL_ID)
             .setSmallIcon(android.R.drawable.stat_notify_sync)
-            .setContentTitle("Synchronisierung läuft")
-            .setContentText("Notizen werden synchronisiert...")
+            .setContentTitle(context.getString(R.string.notification_sync_in_progress_title))
+            .setContentText(context.getString(R.string.notification_sync_in_progress_message))
             .setPriority(NotificationCompat.PRIORITY_LOW)
             .setOngoing(true)
             .build()
@@ -213,7 +250,7 @@ object NotificationHelper {
      */
     fun showSyncSuccess(context: Context, count: Int) {
         // PendingIntent für App-Öffnung
-        val intent = Intent(context, MainActivity::class.java).apply {
+        val intent = Intent(context, ComposeMainActivity::class.java).apply {
             flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TOP
         }
         val pendingIntent = PendingIntent.getActivity(
@@ -225,8 +262,8 @@ object NotificationHelper {
         
         val notification = NotificationCompat.Builder(context, CHANNEL_ID)
             .setSmallIcon(android.R.drawable.stat_notify_sync)
-            .setContentTitle("Sync erfolgreich")
-            .setContentText("$count Notizen synchronisiert")
+            .setContentTitle(context.getString(R.string.notification_sync_success_title))
+            .setContentText(context.getString(R.string.notification_sync_success_message, count))
             .setPriority(NotificationCompat.PRIORITY_DEFAULT)
             .setCategory(NotificationCompat.CATEGORY_STATUS)
             .setContentIntent(pendingIntent)  // Click öffnet App
@@ -240,10 +277,11 @@ object NotificationHelper {
     
     /**
      * Zeigt Fehler-Notification
+     * Auto-Cancel nach 30 Sekunden
      */
     fun showSyncError(context: Context, message: String) {
         // PendingIntent für App-Öffnung
-        val intent = Intent(context, MainActivity::class.java).apply {
+        val intent = Intent(context, ComposeMainActivity::class.java).apply {
             flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TOP
         }
         val pendingIntent = PendingIntent.getActivity(
@@ -255,7 +293,7 @@ object NotificationHelper {
         
         val notification = NotificationCompat.Builder(context, CHANNEL_ID)
             .setSmallIcon(android.R.drawable.stat_notify_error)
-            .setContentTitle("Sync Fehler")
+            .setContentTitle(context.getString(R.string.notification_sync_error_title))
             .setContentText(message)
             .setPriority(NotificationCompat.PRIORITY_DEFAULT)
             .setCategory(NotificationCompat.CATEGORY_ERROR)
@@ -266,5 +304,46 @@ object NotificationHelper {
         val manager = context.getSystemService(Context.NOTIFICATION_SERVICE) 
             as NotificationManager
         manager.notify(SYNC_NOTIFICATION_ID, notification)
+        
+        // ⭐ NEU: Auto-Cancel nach 30 Sekunden
+        Handler(Looper.getMainLooper()).postDelayed({
+            manager.cancel(SYNC_NOTIFICATION_ID)
+            Logger.d(TAG, "🗑️ Auto-cancelled error notification after 30s timeout")
+        }, AUTO_CANCEL_TIMEOUT_MS)
+    }
+    
+    /**
+     * Zeigt Warnung wenn Server längere Zeit nicht erreichbar (v1.1.2)
+     * Throttling: Max. 1 Warnung pro 24h
+     */
+    fun showSyncWarning(context: Context, hoursSinceLastSync: Long) {
+        // PendingIntent für App-Öffnung
+        val intent = Intent(context, ComposeMainActivity::class.java).apply {
+            flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TOP
+        }
+        val pendingIntent = PendingIntent.getActivity(
+            context,
+            0,
+            intent,
+            PendingIntent.FLAG_IMMUTABLE or PendingIntent.FLAG_UPDATE_CURRENT
+        )
+        
+        val notification = NotificationCompat.Builder(context, CHANNEL_ID)
+            .setSmallIcon(android.R.drawable.stat_notify_error)
+            .setContentTitle(context.getString(R.string.notification_sync_warning_title))
+            .setContentText(context.getString(R.string.notification_sync_warning_message, hoursSinceLastSync.toInt()))
+            .setStyle(NotificationCompat.BigTextStyle()
+                .bigText(context.getString(R.string.notification_sync_warning_detail, hoursSinceLastSync.toInt())))
+            .setPriority(NotificationCompat.PRIORITY_DEFAULT)
+            .setCategory(NotificationCompat.CATEGORY_STATUS)
+            .setContentIntent(pendingIntent)
+            .setAutoCancel(true)
+            .build()
+        
+        val manager = context.getSystemService(Context.NOTIFICATION_SERVICE) 
+            as NotificationManager
+        manager.notify(SYNC_NOTIFICATION_ID, notification)
+        
+        Logger.d(TAG, "⚠️ Showed sync warning: Server unreachable for ${hoursSinceLastSync}h")
     }
 }

android/app/src/main/java/dev/dettmer/simplenotes/utils/SyncConstants.kt

@@ -0,0 +1,13 @@
+package dev.dettmer.simplenotes.utils
+
+/**
+ * Konstanten für Sync-Operationen
+ */
+object SyncConstants {
+    // Debounce Delays
+    const val SEARCH_DEBOUNCE_MS = 300L
+    const val SYNC_DEBOUNCE_MS = 500L
+    
+    // Connection Timeouts
+    const val CONNECTION_TEST_TIMEOUT_MS = 5000L
+}

android/app/src/main/java/dev/dettmer/simplenotes/utils/SyncException.kt

@@ -0,0 +1,21 @@
+package dev.dettmer.simplenotes.utils
+
+/**
+ * Exception für Sync-spezifische Fehler
+ * 
+ * Verwendet anstelle von generischen Exceptions für bessere
+ * Fehlerbehandlung und klarere Fehlermeldungen.
+ */
+class SyncException(
+    message: String,
+    cause: Throwable? = null
+) : Exception(message, cause)
+
+/**
+ * Exception für Validierungsfehler
+ * 
+ * Verwendet für ungültige Eingaben oder Konfigurationsfehler.
+ */
+class ValidationException(
+    message: String
+) : IllegalArgumentException(message)

android/app/src/main/java/dev/dettmer/simplenotes/utils/UrlValidator.kt

@@ -0,0 +1,123 @@
+package dev.dettmer.simplenotes.utils
+
+import android.content.Context
+import dev.dettmer.simplenotes.R
+import java.net.URL
+
+/**
+ * URL Validator für Network Security (v1.1.2)
+ * Erlaubt HTTP nur für lokale Netzwerke (RFC 1918 Private IPs)
+ */
+object UrlValidator {
+    
+    // RFC 1918 Private IP Ranges
+    private const val PRIVATE_CLASS_A_FIRST_OCTET = 10
+    private const val PRIVATE_CLASS_B_FIRST_OCTET = 172
+    private const val PRIVATE_CLASS_B_SECOND_OCTET_MIN = 16
+    private const val PRIVATE_CLASS_B_SECOND_OCTET_MAX = 31
+    private const val PRIVATE_CLASS_C_FIRST_OCTET = 192
+    private const val PRIVATE_CLASS_C_SECOND_OCTET = 168
+    private const val LOCALHOST_FIRST_OCTET = 127
+    private const val OCTET_MAX_VALUE = 255
+    
+    /**
+     * Prüft ob eine URL eine lokale/private Adresse ist
+     * Erlaubt:
+     * - 192.168.x.x (Class C private)
+     * - 10.x.x.x (Class A private)
+     * - 172.16.x.x - 172.31.x.x (Class B private)
+     * - 127.x.x.x (Localhost)
+     * - .local domains (mDNS/Bonjour)
+     */
+    @Suppress("ReturnCount") // Early returns for validation checks are clearer
+    fun isLocalUrl(url: String): Boolean {
+        return try {
+            val parsedUrl = URL(url)
+            val host = parsedUrl.host.lowercase()
+            
+            // Check for .local domains (e.g., nas.local)
+            if (host.endsWith(".local")) {
+                return true
+            }
+            
+            // Check for localhost
+            if (host == "localhost" || host == "127.0.0.1") {
+                return true
+            }
+            
+            // Parse IP address if it's numeric
+            val ipPattern = """^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$""".toRegex()
+            val match = ipPattern.find(host)
+            
+            if (match != null) {
+                val octets = match.groupValues.drop(1).map { it.toInt() }
+                
+                // Validate octets are in range 0-255
+                if (octets.any { it > OCTET_MAX_VALUE }) {
+                    return false
+                }
+                
+                // Extract octets individually (destructuring with 4 elements triggers detekt warning)
+                val o1 = octets[0]
+                val o2 = octets[1]
+                
+                // Check RFC 1918 private IP ranges
+                return when {
+                    // 10.0.0.0/8 (10.0.0.0 - 10.255.255.255)
+                    o1 == PRIVATE_CLASS_A_FIRST_OCTET -> true
+                    
+                    // 172.16.0.0/12 (172.16.0.0 - 172.31.255.255)
+                    o1 == PRIVATE_CLASS_B_FIRST_OCTET &&
+                        o2 in PRIVATE_CLASS_B_SECOND_OCTET_MIN..PRIVATE_CLASS_B_SECOND_OCTET_MAX -> true
+                    
+                    // 192.168.0.0/16 (192.168.0.0 - 192.168.255.255)
+                    o1 == PRIVATE_CLASS_C_FIRST_OCTET &&
+                        o2 == PRIVATE_CLASS_C_SECOND_OCTET -> true
+                    
+                    // 127.0.0.0/8 (Localhost)
+                    o1 == LOCALHOST_FIRST_OCTET -> true
+                    
+                    else -> false
+                }
+            }
+            
+            // Not a recognized local address
+            false
+        } catch (e: Exception) {
+            Logger.w("UrlValidator", "Failed to parse URL: ${e.message}")
+            false
+        }
+    }
+    
+    /**
+     * Validiert ob HTTP URL erlaubt ist
+     * @return Pair<Boolean, String?> - (isValid, errorMessage)
+     */
+    fun validateHttpUrl(context: Context, url: String): Pair<Boolean, String?> {
+        return try {
+            val parsedUrl = URL(url)
+            
+            // HTTPS ist immer erlaubt
+            if (parsedUrl.protocol.equals("https", ignoreCase = true)) {
+                return Pair(true, null)
+            }
+            
+            // HTTP nur für lokale URLs erlaubt
+            if (parsedUrl.protocol.equals("http", ignoreCase = true)) {
+                if (isLocalUrl(url)) {
+                    return Pair(true, null)
+                } else {
+                    return Pair(
+                        false,
+                        context.getString(R.string.error_http_local_only)
+                    )
+                }
+            }
+            
+            // Anderes Protokoll
+            Pair(false, context.getString(R.string.error_invalid_protocol, parsedUrl.protocol))
+        } catch (e: Exception) {
+            Pair(false, context.getString(R.string.error_invalid_url, e.message ?: ""))
+        }
+    }
+}

android/app/src/main/res/anim/slide_in_left.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Slide in from left - Main screen return animation -->
+<set xmlns:android="http://schemas.android.com/apk/res/android"
+    android:interpolator="@android:interpolator/accelerate_decelerate">
+    <translate
+        android:fromXDelta="-100%"
+        android:toXDelta="0%"
+        android:duration="300" />
+</set>

android/app/src/main/res/anim/slide_in_right.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Slide in from right - Settings opening animation -->
+<set xmlns:android="http://schemas.android.com/apk/res/android"
+    android:interpolator="@android:interpolator/accelerate_decelerate">
+    <translate
+        android:fromXDelta="100%"
+        android:toXDelta="0%"
+        android:duration="300" />
+</set>

android/app/src/main/res/anim/slide_out_left.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Slide out to left - Main screen exit when opening Settings -->
+<set xmlns:android="http://schemas.android.com/apk/res/android"
+    android:interpolator="@android:interpolator/accelerate_decelerate">
+    <translate
+        android:fromXDelta="0%"
+        android:toXDelta="-100%"
+        android:duration="300" />
+</set>

android/app/src/main/res/anim/slide_out_right.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Slide out to right - Settings closing animation -->
+<set xmlns:android="http://schemas.android.com/apk/res/android"
+    android:interpolator="@android:interpolator/accelerate_decelerate">
+    <translate
+        android:fromXDelta="0%"
+        android:toXDelta="100%"
+        android:duration="300" />
+</set>

android/app/src/main/res/drawable/ic_checklist_24.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorOnSurface">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M22,7h-9v2h9V7zM22,15h-9v2h9V15zM5.54,11L2,7.46l1.41,-1.41l2.12,2.12l4.24,-4.24l1.41,1.41L5.54,11zM5.54,19L2,15.46l1.41,-1.41l2.12,2.12l4.24,-4.24l1.41,1.41L5.54,19z"/>
+</vector>

android/app/src/main/res/drawable/ic_delete_24.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorOnSurfaceVariant">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M6,19c0,1.1 0.9,2 2,2h8c1.1,0 2,-0.9 2,-2V7H6v12zM19,4h-3.5l-1,-1h-5l-1,1H5v2h14V4z"/>
+</vector>

android/app/src/main/res/drawable/ic_drag_handle_24.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorOnSurfaceVariant">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M20,9H4v2h16V9zM4,15h16v-2H4v2z"/>
+</vector>

android/app/src/main/res/drawable/ic_launcher_background.xml

@@ -1,170 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="108dp"
-    android:height="108dp"
-    android:viewportWidth="108"
-    android:viewportHeight="108">
-    <path
-        android:fillColor="#3DDC84"
-        android:pathData="M0,0h108v108h-108z" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M9,0L9,108"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M19,0L19,108"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M29,0L29,108"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M39,0L39,108"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M49,0L49,108"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M59,0L59,108"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M69,0L69,108"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M79,0L79,108"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M89,0L89,108"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M99,0L99,108"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,9L108,9"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,19L108,19"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,29L108,29"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,39L108,39"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,49L108,49"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,59L108,59"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,69L108,69"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,79L108,79"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,89L108,89"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M0,99L108,99"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M19,29L89,29"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M19,39L89,39"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M19,49L89,49"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M19,59L89,59"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M19,69L89,69"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M19,79L89,79"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M29,19L29,89"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M39,19L39,89"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M49,19L49,89"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M59,19L59,89"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M69,19L69,89"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-    <path
-        android:fillColor="#00000000"
-        android:pathData="M79,19L79,89"
-        android:strokeWidth="0.8"
-        android:strokeColor="#33FFFFFF" />
-</vector>