- Introduced `oauthLogin` method in `electron/preload.ts` and backend IPC handlers for OAuth via `BrowserWindow`.
- Replaced web-based OAuth redirection with Electron-specific implementation for Google, Facebook, and Apple.
- Refactored `SocialForm.tsx` to handle OAuth login success and token management via Electron.
- Updated `User`, `QuillSense`, and context methods to include `quill-trial` subscriptions and extended login logic.
- Cleaned up code, removed unused imports, and improved error handling for authentication scenarios.
- Add offline handling to `AddNewBookForm` by updating `BooksSyncContext` with server-only and local-only book management.
- Refactor `guideTourDone` to check offline completion states via `localStorage`.
- Update and lock dependencies, including `@esbuild` and `@next`, to latest versions.
- Clean up unused session state updates in book creation logic.
- Introduce `BooksSyncContext` for managing book synchronization states (server-only, local-only, to-sync, etc.).
- Remove `UserContext` and related dependencies.
- Refine localization strings (`en.json`) with sync-related updates (e.g., "toSyncFromServer", "toSyncToServer").
- Extend database schema with additional tables and fields for syncing books, chapters, and related entities.
- Add `last_update` fields and update corresponding repository methods to support synchronization logic.
- Enhance IPC handlers with stricter typing, data validation, and sync-aware operations.
- Implement `remove-inline-scripts.js` to externalize Next.js inline scripts, enhancing CSP compliance.
- Add models for `Book`, `Character`, `Story`, `Editor`, `System`, and `BookSerie` with relevant properties and utilities.
- Include macOS entitlements plist for app development with advanced permissions.
- Add utility functions to handle script hashing, cookie management, and content formatting.
