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/ghostwriter/GhostWriterSettings.tsx

@@ -1,13 +1,13 @@
 import InputField from "@/components/form/InputField";
-import TexteAreaInput from "@/components/form/TexteAreaInput";
+import TextAreaInput from "@/components/form/TextAreaInput";
 import {ChangeEvent, Dispatch, SetStateAction, useContext, useEffect} from "react";
-import {faGuilded} from "@fortawesome/free-brands-svg-icons";
+import {Wand2} from "lucide-react";
 import {AlertContext} from "@/context/AlertContext";
-import System from "@/lib/models/System";
+import {apiGet} from "@/lib/api/client";
 import {SessionContext} from "@/context/SessionContext";
 import {BookContext} from "@/context/BookContext";
 import {LangContext, LangContextProps} from "@/context/LangContext";
-import {useTranslations} from "next-intl";
+import {useTranslations} from "@/lib/i18n";
 
 interface GhostWriterSettingsProps {
     advancedPrompt: string;
@@ -24,14 +24,14 @@ export default function GhostWriterSettings(
     const t = useTranslations();
     const {lang} = useContext<LangContextProps>(LangContext)
     const {book} = useContext(BookContext);
-    
+
     useEffect((): void => {
         getAdvancedSettings().catch();
     }, []);
-    
+
     async function getAdvancedSettings(): Promise<void> {
         try {
-            const setting: string = await System.authGetQueryToServer<string>(`quillsense/ghostwriter/advanced-settings`, session.accessToken, lang, {
+            const setting: string = await apiGet<string>(`quillsense/ghostwriter/advanced-settings`, session.accessToken, lang, {
                 bookId: book?.bookId
             });
             if (setting) {
@@ -45,14 +45,14 @@ export default function GhostWriterSettings(
             }
         }
     }
-    
+
     return (
         <div className={`p-4 lg:p-5 space-y-5 overflow-y-auto flex-grow custom-scrollbar`}>
-            <InputField input={<TexteAreaInput value={advancedPrompt}
-                                               setValue={(e: ChangeEvent<HTMLTextAreaElement>): void => setAdvancedPrompt(e.target.value)}
-                                               placeholder={`Information complémentaire pour la génération...`}
-                                               maxLength={600}/>}
-                        fieldName={`Prompt additionnel`} icon={faGuilded}/>
+            <InputField input={<TextAreaInput value={advancedPrompt}
+                                             setValue={(e: ChangeEvent<HTMLTextAreaElement>): void => setAdvancedPrompt(e.target.value)}
+                                             placeholder={`Information complémentaire pour la génération...`}
+                                             maxLength={600}/>}
+                        fieldName={`Prompt additionnel`} icon={Wand2}/>
         </div>
     );
-}
+}