Release v1.2.0 - Local Backup & Markdown Desktop Integration

✨ New Features:
- Local backup/restore system with 3 modes (Merge/Replace/Overwrite)
- Markdown export for desktop access via WebDAV mount
- Dual-format architecture (JSON master + Markdown mirror)
- Settings UI extended with backup & desktop integration sections

📝 Changes:
- Server restore now asks for mode selection (user safety)
- WebDAV mount instructions for Windows/Mac/Linux in README
- Complete CHANGELOG.md with all version history

🔧 Technical:
- BackupManager.kt for complete backup/restore logic
- Note.toMarkdown/fromMarkdown with YAML frontmatter
- ISO8601 timestamps for desktop compatibility
- Last-Write-Wins conflict resolution

📚 Documentation:
- CHANGELOG.md (Keep a Changelog format)
- README updates (removed Joplin/Obsidian, added WebDAV-mount)
- F-Droid changelogs (DE+EN, under 500 chars)
- SYNC_ARCHITECTURE.md in project-docs
- MARKDOWN_DESKTOP_REALITY_CHECK.md strategic plan
- WEB_EDITOR_PLAN_v1.3.0.md for future web editor feature

README.en.md

@@ -29,11 +29,25 @@
 * Swipe-to-delete with confirmation
 * Material Design 3 editor
 
+### 💾 Backup & Restore **NEW in v1.2.0**
+* **Local backup** - Export all notes as JSON file
+* **Flexible restore** - 3 modes (Merge, Replace, Overwrite)
+* **Automatic safety net** - Auto-backup before every restore
+* **Independent from server** - Works completely offline
+
+### 🖥️ Desktop Integration **NEW in v1.2.0**
+* **Markdown export** - Notes are automatically exported as `.md` files
+* **WebDAV access** - Mount WebDAV as network drive for direct access
+* **Editor compatibility** - VS Code, Typora, Notepad++, or any Markdown editor
+* **Last-Write-Wins** - Intelligent conflict resolution via timestamps
+* **Dual-format** - JSON sync remains master, Markdown is optional mirror
+
 ### 🔄 Synchronization
 * **Pull-to-refresh** for manual sync
 * **Auto-sync** (15/30/60 min) only on home WiFi
 * **Smart server check** - No errors on foreign networks
 * **Conflict-free merging** - Your changes are never lost
+* **6 sync triggers** - Periodic, app-start, WiFi, manual, pull-to-refresh, settings
 
 ### 🔒 Privacy & Self-Hosted
 * **WebDAV server** (Nextcloud, ownCloud, etc.)
@@ -73,7 +87,98 @@ docker compose up -d
 
 ---
 
-## 📚 Documentation
+## <EFBFBD> Local Backup & Restore
+
+### Create Backup
+
+1. **Settings** → **Backup & Restore**
+2. Tap **"📥 Create backup"**
+3. Choose location (Downloads, SD card, cloud folder)
+4. Done! All notes are saved in a `.json` file
+
+**Filename:** `simplenotes_backup_YYYY-MM-DD_HHmmss.json`
+
+### Restore
+
+1. **Settings** → **"📤 Restore from file"**
+2. Select backup file
+3. **Choose restore mode:**
+   - **Merge** _(Default)_ - Add new notes, keep existing ones
+   - **Replace** - Delete all and import backup
+   - **Overwrite duplicates** - Backup wins on ID conflicts
+4. Confirm - _Automatic safety backup is created!_
+
+**💡 Tip:** Before every restore, an automatic safety backup is created - your data is safe!
+
+---
+
+## 🖥️ Desktop Integration (WebDAV + Markdown)
+
+### Why Markdown?
+
+The app automatically exports your notes as `.md` files so you can edit them on desktop:
+
+- **JSON remains master** - Primary sync mechanism (reliable, fast)
+- **Markdown is mirror** - Additional export for desktop access
+- **Dual-format** - Both formats are always in sync
+
+### Setup: WebDAV as Network Drive
+
+**With WebDAV mount ANY Markdown editor works!**
+
+#### Windows:
+
+1. **Open Explorer** → Right-click on "This PC"
+2. **"Map network drive"**
+3. **Enter WebDAV URL:** `http://YOUR-SERVER:8080/notes-md/`
+4. Enter username/password
+5. **Done!** - Folder appears as drive (e.g. Z:\)
+
+#### macOS:
+
+1. **Finder** → Menu "Go" → "Connect to Server" (⌘K)
+2. **Server Address:** `http://YOUR-SERVER:8080/notes-md/`
+3. Enter username/password
+4. **Done!** - Folder appears under "Network"
+
+#### Linux:
+
+```bash
+# Option 1: GNOME Files / Nautilus
+Files → Other Locations → Connect to Server
+Server Address: dav://YOUR-SERVER:8080/notes-md/
+
+# Option 2: davfs2 (permanent mount)
+sudo apt install davfs2
+sudo mount -t davfs http://YOUR-SERVER:8080/notes-md/ /mnt/notes
+```
+
+### Workflow:
+
+1. **Enable Markdown export** (App → Settings)
+2. **Mount WebDAV** (see above)
+3. **Open editor** (VS Code, Typora, Notepad++, etc.)
+4. **Edit notes** - Changes are saved directly
+5. **"Import Markdown Changes" in app** - Import desktop changes
+
+**Recommended Editors:**
+- **VS Code** - Free, powerful, with Markdown preview
+- **Typora** - Minimalist, WYSIWYG Markdown
+- **Notepad++** - Lightweight, fast
+- **iA Writer** - Focused writing
+
+- **VS Code** with WebDAV extension
+- **Typora** (local copy)
+- **iA Writer** (read/edit only, no auto-sync)
+
+**⚠️ Important:** 
+- Markdown export is **optional** (toggle in settings)
+- JSON sync **always** works - Markdown is additional
+- All 6 sync triggers remain unchanged
+
+---
+
+## <20>📚 Documentation
 
 - **[Quick Start Guide](QUICKSTART.en.md)** - Step-by-step guide for end users
 - **[Server Setup](server/README.en.md)** - Configure WebDAV server
@@ -98,8 +203,14 @@ Contributions are welcome! See [CONTRIBUTING.md](CONTRIBUTING.md) for details.
 
 ---
 
-## 📄 License
+## <EFBFBD> Changelog
+
+All changes are documented in [CHANGELOG.md](CHANGELOG.md).
+
+---
+
+## <20>📄 License
 
 MIT License - see [LICENSE](LICENSE)
 
-**v1.1.2** · Built with Kotlin + Material Design 3
+**v1.2.0** · Built with Kotlin + Material Design 3