Add comprehensive offline bookmark support with sync capabilities:
- Implement offline bookmark storage using Core Data with App Group sharing
- Add Share Extension support for saving bookmarks when server unavailable
- Create LocalBookmarksSyncView for managing offline bookmark queue
- Add OfflineSyncManager for automatic and manual sync operations
- Implement ServerConnectivity monitoring and status handling
- Add badge notifications on More tab for pending offline bookmarks
- Fix tag pagination in Share Extension with unique IDs for proper rendering
- Update PhoneTabView with event-based badge count updates
- Add App Group entitlements for data sharing between main app and extension
The offline system provides seamless bookmark saving when disconnected,
with automatic sync when connection is restored and manual sync options.
- Add BookmarkLabel model and DTO
- Create LabelsRepository and PLabelsRepository protocol
- Add GetLabelsUseCase for fetching labels
- Update BookmarkMapper to handle labels
- Add LabelsView and LabelsViewModel for UI
- Update BookmarksView and BookmarkLabelsView to display labels
- Add green2 color asset for labels
- Update API and repository layers to support labels
