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.

components/book/settings/story/act/ActChapter.tsx

@@ -1,9 +1,9 @@
-import {ChangeEvent} from 'react';
-import {faTrash} from '@fortawesome/free-solid-svg-icons';
-import {ActChapter} from '@/lib/models/Chapter';
+import React, {ChangeEvent} from 'react';
+import {Trash2} from 'lucide-react';
+import {ActChapter} from '@/lib/types/chapter';
 import InputField from '@/components/form/InputField';
-import TexteAreaInput from '@/components/form/TexteAreaInput';
-import {useTranslations} from 'next-intl';
+import TextAreaInput from '@/components/form/TextAreaInput';
+import {useTranslations} from '@/lib/i18n';
 
 interface ActChapterItemProps {
     chapter: ActChapter;
@@ -15,11 +15,10 @@ export default function ActChapterItem({chapter, onUpdateSummary, onUnlink}: Act
     const t = useTranslations('actComponent');
     
     return (
-        <div
-            className="bg-secondary/20 p-4 rounded-xl mb-3 border border-secondary/30 shadow-sm hover:shadow-md transition-all duration-200">
+        <div className="mb-3">
             <InputField
                 input={
-                    <TexteAreaInput
+                    <TextAreaInput
                         value={chapter.summary || ''}
                         setValue={(e: ChangeEvent<HTMLTextAreaElement>) =>
                             onUpdateSummary(chapter.chapterId, e.target.value)
@@ -27,7 +26,7 @@ export default function ActChapterItem({chapter, onUpdateSummary, onUnlink}: Act
                         placeholder={t('chapterSummaryPlaceholder')}
                     />
                 }
-                actionIcon={faTrash}
+                actionIcon={Trash2}
                 fieldName={chapter.title}
                 action={(): Promise<void> => onUnlink(chapter.chapterInfoId, chapter.chapterId)}
                 actionLabel={t('remove')}