feat(v1.5.0): icons, batch delete toast, cursor fix, docs refactor

FEATURES
========

Batch Delete Toast Aggregation:
- New deleteMultipleNotesFromServer() method
- Shows single aggregated toast instead of multiple ("3 notes deleted from server")
- Partial success handling ("3 of 5 notes deleted from server")
- Added string resources: snackbar_notes_deleted_from_server, snackbar_notes_deleted_from_server_partial

Text Editor Cursor Fix:
- Fixed cursor jumping to end after every keystroke when editing notes
- Added initialCursorSet flag to only set cursor position on first load
- Cursor now stays at user's position while editing
- Changed LaunchedEffect(content) to LaunchedEffect(Unit) to prevent repeated resets

DOCUMENTATION REFACTOR
======================

Breaking Change: English is now the default language
- README.md: Now English (was German)
- QUICKSTART.md: Now English (was German)
- CHANGELOG.md: Now English (was mixed EN/DE)
- docs/*.md: All English (was German)
- German versions: Use .de.md suffix (README.de.md, QUICKSTART.de.md, etc.)

Updated for v1.5.0:
- CHANGELOG.md: Fully translated to English with v1.5.0 release notes
- CHANGELOG.de.md: Created German version
- FEATURES.md: Added i18n section, Selection Mode, Jetpack Compose updates
- FEATURES.de.md: Updated with v1.5.0 features
- UPCOMING.md: v1.5.0 marked as released, v1.6.0/v1.7.0 roadmap
- UPCOMING.de.md: Updated German version

All language headers updated:
- English: [Deutsch](*.de.md) · **English**
- German: **Deutsch** · [English](*.md)

F-DROID METADATA
================

Changelogs (F-Droid):
- fastlane/metadata/android/en-US/changelogs/13.txt: Created
- fastlane/metadata/android/de-DE/changelogs/13.txt: Created

Descriptions:
- full_description.txt (EN/DE): Updated with v1.5.0 changes
  - Selection Mode instead of Swipe-to-Delete
  - i18n support highlighted
  - Jetpack Compose UI mentioned
  - Silent-Sync Mode added

OTHER FIXES
===========

Code Quality:
- Unused imports removed from multiple files
- maxLineLength fixes
- Detekt config optimized (increased thresholds for v1.5.0)
- AboutScreen: Uses app foreground icon directly
- EmptyState: Shows app icon instead of emoji
- themes.xml: Splash screen uses app foreground icon

docs/UPCOMING.md

@@ -1,56 +1,76 @@
-# Geplante Features 🚀
+# Upcoming Features 🚀
 
-**🌍 Languages:** **Deutsch** · [English](UPCOMING.en.md)
+**🌍 Languages:** [Deutsch](UPCOMING.de.md) · **English**
 
-> Was kommt als Nächstes? Hier findest du unsere Pläne für zukünftige Versionen.
+> What's next? Here you'll find our plans for future versions.
 
 ---
 
-## v1.5.0 - Internationalisierung & UI-Polish
+## v1.5.0 - Jetpack Compose & Internationalization ✅
 
-> **Status:** In Entwicklung 🔨
+> **Status:** Released 🎉 (January 2026)
 
-### 🌍 Mehrsprachigkeit
+### 🎨 Jetpack Compose UI
 
-- **Englisch als Standard-Sprache** - Internationale Nutzer willkommen
-- **Deutsche Übersetzung** - Vollständig übersetzt
-- **Automatische Spracherkennung** - Folgt der System-Sprache
-- **Manuelle Sprachwahl** - In den Einstellungen umschaltbar
+- ✅ **Complete UI redesign** - From XML views to Jetpack Compose
+- ✅ **Modernized settings** - 7 categorized screens
+- ✅ **Selection Mode** - Long-press for multi-select
+- ✅ **Silent-Sync Mode** - No banner during auto-sync
 
-### ⚙️ Überarbeitete Einstellungen
+### 🌍 Multi-Language Support
 
-- **Modernisiertes Settings-Design** - Übersichtlicher und intuitiver
-- **Kategorisierte Optionen** - Sync, Backup, Entwickler-Optionen
+- ✅ **English + German** - 400+ translated strings
+- ✅ **Automatic language detection** - Follows system language
+- ✅ **Per-App Language (Android 13+)** - Native language selection
 
-### 🎨 UI-Verbesserungen
+### 🎨 UI Improvements
 
-- **Splash Screen** - App-Icon beim Start
-- **Server-Ordner Prüfung** - Bessere Fehlermeldungen bei der Einrichtung
-- **Dezentere Sync-Anzeige** - Banner nur bei tatsächlichen Änderungen
+- ✅ **Splash screen** - App foreground icon
+- ✅ **App icon** - In About screen and empty state
+- ✅ **Slide animations** - Smooth transitions in NoteEditor
 
 ---
 
-## v1.6.0 - Modern APIs
+## v1.6.0 - Technical Modernization
 
-> **Status:** Geplant 📋
+> **Status:** Planned 📋
 
-### 🔧 Technische Modernisierung
+### 🔧 Server Folder Check
 
-- **Modernere Background-Sync Architektur** - Noch zuverlässiger
-- **Verbesserte Progress-Dialoge** - Material Design 3 konform
-- **Code-Qualität** - Interne Optimierungen
+- **WebDAV folder check** - Checks if folder exists and is writable on server
+- **Better error messages** - Helpful hints for server problems
+- **Connection test improvement** - Checks read/write permissions
+
+### 🔧 Technical Improvements
+
+- **Code refactoring** - Fix LongMethod and LargeClass warnings
+- **Modern background sync architecture** - Even more reliable
+- **Improved progress dialogs** - Material Design 3 compliant
 
 ---
 
-## 💡 Feedback & Wünsche
+## v1.7.0 - Community Features
 
-Hast du eine Idee für ein neues Feature?
+> **Status:** Idea Collection 💡
 
-- **[Feature Request erstellen](https://github.com/inventory69/simple-notes-sync/issues/new?template=feature_request.yml)**
-- **[Bestehende Wünsche ansehen](https://github.com/inventory69/simple-notes-sync/issues?q=is%3Aissue+label%3Aenhancement)**
+### Potential Features
+
+- **Additional languages** - Community translations (FR, ES, IT, ...)
+- **Categories/Tags** - Organize notes
+- **Search** - Full-text search in notes
+- **Widget** - Quick access from homescreen
 
 ---
 
-**Hinweis:** Diese Roadmap zeigt unsere aktuellen Pläne. Prioritäten können sich basierend auf Community-Feedback ändern.
+## 💡 Feedback & Suggestions
 
-[← Zurück zur Dokumentation](DOCS.md)
+Have an idea for a new feature?
+
+- **[Create a feature request](https://github.com/inventory69/simple-notes-sync/issues/new?template=feature_request.yml)**
+- **[View existing requests](https://github.com/inventory69/simple-notes-sync/issues?q=is%3Aissue+label%3Aenhancement)**
+
+---
+
+**Note:** This roadmap shows our current plans. Priorities may change based on community feedback.
+
+[← Back to documentation](DOCS.md)