Introduce local fallback for book creation and improve error handling

- Added support for creating books locally when the cloud limit is reached.
- Enhanced error handling in `AddNewBookForm` with `ApiError` and fallback logic for local book creation.
- Implemented `BookTypeLimit` to manage type-specific book limits with visual indicators in `BookList`.
- Refactored `TombstoneRecord` to standardize naming conventions for better API compatibility.
- Updated `useSyncSeries` and `useSyncBooks` to handle empty tombstones gracefully.
- Updated locales with new translations for fallback and error messaging.

lib/types/book.ts

@@ -106,3 +106,8 @@ export interface BookTags {
     objects: Tag[];
     worldElements: Tag[];
 }
+
+export interface BookTypeLimit {
+    current: number;
+    max: number;
+}