- Add DELETED_ON_SERVER to SyncStatus enum
- Add deletedOnServerCount to SyncResult
- Implement detectServerDeletions() function in WebDavSyncService
- Integrate server deletion detection in downloadRemoteNotes()
- Update UI icons in NoteCard, NoteCardGrid, NoteCardCompact
- Add string resources for deleted_on_server status
- No additional HTTP requests (uses existing PROPFIND data)
- Zero performance impact
Closes #IMPL_016
40d7c83c84