- Replace multiple boolean properties with single OfflineBookmarkSyncState enum
- Add Use Case pattern for OfflineSyncManager with dependency injection
- Simplify LocalBookmarksSyncView using state-driven UI with external bindings
- Convert OfflineBookmarksViewModel to use @Observable instead of ObservableObject
- Move credentials from Core Data to Keychain for better persistence
- Implement comprehensive database migration for App Group containers
- Add structured logging throughout sync operations and API calls
Architecture improvements follow MVVM principles with clean separation of concerns.