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/constants/book.ts

@@ -0,0 +1,9 @@
+import {SelectBoxProps} from "@/components/form/SelectBox";
+
+export const bookTypes: SelectBoxProps[] = [
+    {label: 'bookTypes.short', value: 'short'},
+    {label: 'bookTypes.novelette', value: 'novelette'},
+    {label: 'bookTypes.novella', value: 'long'},
+    {label: 'bookTypes.chapbook', value: 'chapbook'},
+    {label: 'bookTypes.novel', value: 'novel'},
+];