[skip ci] feat: new app icon with monochrome support & updated descriptions

🎨 New App Icon:
- Fresh adaptive icon design with warm background (#f9e9c8)
- Monochrome icon support for Android 13+ themed icons
- PNG format replacing WebP for better compatibility
- All densities: mdpi, hdpi, xhdpi, xxhdpi, xxxhdpi

📝 Updated Descriptions (EN/DE):
- Added Multi-Device Sync feature
- Added Markdown export for Obsidian/desktop editors
- Added deletion tracking (zombie notes prevention)
- Added E-Tag caching (20x faster checks)
- Added optimized performance (~2-3s sync time)
- Added live sync status indicator
- Added Server-Restore modes (Merge/Replace/Overwrite)

📦 F-Droid Metadata:
- Updated build entries for v1.2.1, v1.2.2, v1.3.0, v1.3.1
- CurrentVersion now 1.3.1 (versionCode 9)
- Prepared for F-Droid merge request submission

metadata/dev.dettmer.simplenotes.yml

@@ -63,7 +63,63 @@ Builds:
     scandelete:
       - android/gradle/wrapper
 
+  - versionName: 1.2.1
+    versionCode: 6
+    commit: v1.2.1
+    subdir: android/app
+    sudo:
+      - apt-get update
+      - apt-get install -y openjdk-17-jdk-headless
+      - update-java-alternatives -a
+    gradle:
+      - fdroid
+    prebuild: sed -i -e '/signingConfig/d' build.gradle.kts
+    scandelete:
+      - android/gradle/wrapper
+
+  - versionName: 1.2.2
+    versionCode: 7
+    commit: v1.2.2
+    subdir: android/app
+    sudo:
+      - apt-get update
+      - apt-get install -y openjdk-17-jdk-headless
+      - update-java-alternatives -a
+    gradle:
+      - fdroid
+    prebuild: sed -i -e '/signingConfig/d' build.gradle.kts
+    scandelete:
+      - android/gradle/wrapper
+
+  - versionName: 1.3.0
+    versionCode: 8
+    commit: v1.3.0
+    subdir: android/app
+    sudo:
+      - apt-get update
+      - apt-get install -y openjdk-17-jdk-headless
+      - update-java-alternatives -a
+    gradle:
+      - fdroid
+    prebuild: sed -i -e '/signingConfig/d' build.gradle.kts
+    scandelete:
+      - android/gradle/wrapper
+
+  - versionName: 1.3.1
+    versionCode: 9
+    commit: v1.3.1
+    subdir: android/app
+    sudo:
+      - apt-get update
+      - apt-get install -y openjdk-17-jdk-headless
+      - update-java-alternatives -a
+    gradle:
+      - fdroid
+    prebuild: sed -i -e '/signingConfig/d' build.gradle.kts
+    scandelete:
+      - android/gradle/wrapper
+
 AutoUpdateMode: Version
 UpdateCheckMode: Tags
-CurrentVersion: 1.2.0
-CurrentVersionCode: 5
+CurrentVersion: 1.3.1
+CurrentVersionCode: 9