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/offline/OfflineToggle.tsx

@@ -1,40 +1,39 @@
-'use client';
-
-import { useContext } from 'react';
-import OfflineContext from '@/context/OfflineContext';
-import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
-import { faWifi, faCircle } from '@fortawesome/free-solid-svg-icons';
-
-export default function OfflineToggle() {
-    const { offlineMode, toggleOfflineMode } = useContext(OfflineContext);
-
-    if (!offlineMode.isDatabaseInitialized) {
-        return null;
-    }
-
-    const handleToggle = () => {
-        toggleOfflineMode();
-    };
-
-    return (
-        <button
-            onClick={handleToggle}
-            className={`
-                flex items-center gap-2 px-3 py-1.5 rounded-lg border transition-all
-                ${offlineMode.isOffline
-                    ? 'bg-orange-500/20 border-orange-500/40 hover:bg-orange-500/30'
-                    : 'bg-green-500/20 border-green-500/40 hover:bg-green-500/30'
-                }
-            `}
-            title={offlineMode.isOffline ? 'Passer en mode en ligne' : 'Passer en mode hors ligne'}
-        >
-            <FontAwesomeIcon
-                icon={offlineMode.isOffline ? faCircle : faWifi}
-                className={`w-3 h-3 ${offlineMode.isOffline ? 'text-orange-300' : 'text-green-300'}`}
-            />
-            <span className={`text-xs font-medium ${offlineMode.isOffline ? 'text-orange-200' : 'text-green-200'}`}>
-                {offlineMode.isOffline ? 'Hors ligne' : 'En ligne'}
-            </span>
-        </button>
-    );
-}
+'use client';
+
+import { useContext } from 'react';
+import OfflineContext from '@/context/OfflineContext';
+import { Wifi, Circle } from 'lucide-react';
+
+export default function OfflineToggle() {
+    const { offlineMode, toggleOfflineMode } = useContext(OfflineContext);
+
+    if (!offlineMode.isDatabaseInitialized) {
+        return null;
+    }
+
+    const handleToggle = () => {
+        toggleOfflineMode();
+    };
+
+    return (
+        <button
+            onClick={handleToggle}
+            className={`
+                flex items-center gap-2 px-3 py-1.5 rounded-lg border transition-all
+                ${offlineMode.isOffline
+                    ? 'bg-orange-500/20 border-orange-500/40 hover:bg-orange-500/30'
+                    : 'bg-green-500/20 border-green-500/40 hover:bg-green-500/30'
+                }
+            `}
+            title={offlineMode.isOffline ? 'Passer en mode en ligne' : 'Passer en mode hors ligne'}
+        >
+            {offlineMode.isOffline
+                ? <Circle className="w-3 h-3 text-orange-300" />
+                : <Wifi className="w-3 h-3 text-green-300" />
+            }
+            <span className={`text-xs font-medium ${offlineMode.isOffline ? 'text-orange-200' : 'text-green-200'}`}>
+                {offlineMode.isOffline ? 'Hors ligne' : 'En ligne'}
+            </span>
+        </button>
+    );
+}