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.

context/OfflineContext.ts

@@ -1,35 +1,11 @@
-import { createContext, Dispatch, SetStateAction } from 'react';
-
-export interface OfflineMode {
-    isManuallyOffline: boolean;
-    isNetworkOnline: boolean;
-    isOffline: boolean;
-    isDatabaseInitialized: boolean;
-    error: string | null;
-}
-
-export interface OfflineContextType {
-    offlineMode: OfflineMode;
-    setOfflineMode: Dispatch<SetStateAction<OfflineMode>>;
-    toggleOfflineMode: () => void;
-    initializeDatabase: (userId: string, encryptionKey?: string) => Promise<boolean>;
-    isCurrentlyOffline: () => boolean;
-}
-
-export const defaultOfflineMode: OfflineMode = {
-    isManuallyOffline: false,
-    isNetworkOnline: typeof navigator !== 'undefined' ? navigator.onLine : true,
-    isOffline: false,
-    isDatabaseInitialized: false,
-    error: null
-};
-
-const OfflineContext = createContext<OfflineContextType>({
-    offlineMode: defaultOfflineMode,
-    setOfflineMode: () => {},
-    toggleOfflineMode: () => {},
-    initializeDatabase: async () => false,
-    isCurrentlyOffline: () => false
-});
-
-export default OfflineContext;
+import {createContext} from 'react';
+
+export interface OfflineContextType {
+    isCurrentlyOffline: () => boolean;
+}
+
+const OfflineContext = createContext<OfflineContextType>({
+    isCurrentlyOffline: () => false,
+});
+
+export default OfflineContext;