- Add methods to verify the existence of acts, plot points, incidents, worlds, characters, locations, and their sub-elements in repositories.
- Update `syncBookFromServerToClient` to integrate existence checks with insert or update logic.
- Enhance multilingual error handling across repository methods.
- Extend repository methods to handle API requests for fetching books, chapters, characters, and other entities with multilingual support (`lang: 'fr' | 'en'`).
- Add `uploadBookForSync` logic to consolidate and decrypt book data for synchronization.
- Refactor schema migration logic to remove console logs and streamline table recreation.
- Enhance error handling across database repositories and IPC methods.
- Add `useEffect` in `ScribeLeftBar` for handling book state changes.
- Extend `BooksSyncContext` with new properties and stricter typings.
- Refine `Repositories` to include `lastUpdate` handling for synchronization processes.
- Add comprehensive `fetchComplete*` repository methods for retrieving entity-specific sync data.
- Enhance offline logic for chapters, characters, locations, and world synchronization.
- Improve error handling across IPC handlers and repositories.
- 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.
- Increment `SCHEMA_VERSION` to 2 in `schema.ts`.
- Remove all `meta_*` columns from database tables.
- Add migration logic to handle schema upgrades and clean up unused columns.
- Modify database models and repository methods to exclude `meta_*` fields for stricter typings and improved structure.
- Refactor and optimize query statements across repositories to align with new schema changes.
- Replace absolute import paths with relative paths for consistency across files.
- Transition database operations in Electron main process to modular handlers in `ipc/book.ipc.ts` using the `createHandler` pattern.
- Update database sync service to use `window.electron.invoke()` for improved reliability and structure.
- Refactor `AddNewBookForm` to handle both online and offline book creation seamlessly.
- Delete `data.service.ts` and `offline-data.service.ts`, consolidating functionality into `LocalSystem`.
- Refactor book, character, and conversation operations to adopt unified, multilingual, and session-enabled IPC handlers in `LocalSystem`.
- Simplify redundant legacy methods, enhancing maintainability and consistency.
- Implement `Book` class to manage book-related operations, including CRUD functionality, cover image handling, and metadata management.
- Add interfaces for `BookProps`, `GuideLine`, `Act`, and other related structures.
- Integrate support for encryption and decryption of sensitive data.
- Include multilingual support (`fr` and `en`) for error messages and content handling.
- Establish connection with `book.repository` and other repositories for streamlined database operations.
