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/ActDescription.tsx

@@ -1,8 +1,8 @@
-import {ChangeEvent} from 'react';
-import {faTrash} from '@fortawesome/free-solid-svg-icons';
+import React, {ChangeEvent} from 'react';
+import {Trash2} from 'lucide-react';
 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 ActDescriptionProps {
     actId: number;
@@ -44,7 +44,7 @@ export default function ActDescription({actId, summary, onUpdateSummary}: ActDes
             <InputField
                 fieldName={getActSummaryTitle(actId)}
                 input={
-                    <TexteAreaInput
+                    <TextAreaInput
                         value={summary || ''}
                         setValue={(e: ChangeEvent<HTMLTextAreaElement>) =>
                             onUpdateSummary(actId, e.target.value)
@@ -52,7 +52,7 @@ export default function ActDescription({actId, summary, onUpdateSummary}: ActDes
                         placeholder={getActSummaryPlaceholder(actId)}
                     />
                 }
-                actionIcon={faTrash}
+                actionIcon={Trash2}
                 actionLabel={t('delete')}
             />
         </div>