The app logged itself out in the middle of the OAuth code exchange,
tearing down the page before the callback request could finish.
On resume, the deep-link handler and the sync-on-resume listener fire in
the same tick. Sync ran first, hit a 401 (no session exists yet), and
ApiClient treated that as an expired session: it cleared tokens, wiped
the offline DB, and hard-navigated to /login via window.location.href.
That reload aborted the in-flight POST /auth/oauth2/callback, surfacing
as "Authentication request failed TypeError: Failed to fetch".
- Added offline support for fetching and caching labels and projects using `offlineDB`.
- Enhanced `AdvancedSettings` to include an offline feature toggle with confirmation modal for disabling offline support.
- Introduced `SyncStatusIndicator` component to display sync status, pending commands, and failed commands.
- Created `PendingBadge` component to manage and display pending actions for synchronization.
- Removed deprecated offline mode toggle from `StorageSettings`.
- Improved error handling and user notifications for offline actions and sync processes.
