- Refactor `TextEditor` to include book-closing functionality with updated toolbar buttons
- Replace `generateHTML` with a lightweight custom TipTap-to-HTML renderer
- Update and lock `esbuild` and related dependencies to latest versions
- Introduced `OfflineSyncManager`, `OfflineToggle`, `OfflinePinSetup`, `OfflineIndicator`, and `OfflineSyncDetails` components to support offline mode functionality.
- Added PIN verification (`OfflinePinVerify`) for secure offline access.
- Implemented sync options for books (current, recent, all) with progress tracking and improved user feedback.
- Enhanced offline context integration and error handling in sync processes.
- Refined UI elements for better online/offline status visibility and manual sync controls.
