Remove unused components and models for improved maintainability

- Deleted redundant components (`AddActionButton`, `AlertBox`, `AlertStack`, `BackButton`, `CancelButton`, and `CollapsableArea`) and related files.
- Removed unused models (`Book`, `BookSerie`, `BookTables`, `Character`, and `Chapter`) to reduce codebase clutter.
- Updated project structure and references to reflect these removals.

lib/utils/syncComparison.ts

@@ -16,7 +16,7 @@ import {
     SyncedActSummary,
     SyncedGuideLine,
     SyncedAIGuideLine
-} from "@/lib/models/SyncedBook";
+} from "@/lib/types/synced-book";
 
 /**
  * Résultat de comparaison pour un livre