Add error handling, enhance syncing, and refactor deletion logic

- Introduce new error messages for syncing and book deletion in `en.json`.
- Update `DeleteBook` to support local-only deletion and synced book management.
- Refine offline/online behavior with `deleteLocalToo` checkbox and update related state handling.
- Extend repository and IPC methods to handle optional IDs for updates.
- Add `SyncQueueContext` for queueing offline changes and improving synchronization workflows.
- Enhance refined text generation logic in `DraftCompanion` and `GhostWriter` components.
- Replace PUT with PATCH for world updates to align with API expectations.
- Streamline `AlertBox` by integrating dynamic translation keys for deletion prompts.

electron/main.ts

@@ -1,4 +1,4 @@
-import {app, BrowserWindow, ipcMain, IpcMainInvokeEvent, Menu, nativeImage, protocol, safeStorage, shell} from 'electron';
+import {app, BrowserWindow, dialog, ipcMain, IpcMainInvokeEvent, Menu, nativeImage, protocol, safeStorage, shell} from 'electron';
 import * as path from 'path';
 import {fileURLToPath} from 'url';
 import * as fs from 'fs';
@@ -519,6 +519,73 @@ ipcMain.handle('db-initialize', (_event, userId: string, encryptionKey: string)
   }
 });
 
+/**
+ * Emergency restore - Clean up ALL local data
+ */
+function performEmergencyRestore(): void {
+  try {
+    // Close database connection
+    const db: DatabaseService = getDatabaseService();
+    db.close();
+
+    // Get storage and userId before clearing
+    const storage: SecureStorage = getSecureStorage();
+    const userId = storage.get<string>('userId');
+    const lastUserId = storage.get<string>('lastUserId');
+
+    // Delete user-specific data
+    if (userId) {
+      storage.delete(`pin-${userId}`);
+      storage.delete(`encryptionKey-${userId}`);
+    }
+    if (lastUserId && lastUserId !== userId) {
+      storage.delete(`pin-${lastUserId}`);
+      storage.delete(`encryptionKey-${lastUserId}`);
+    }
+
+    // Delete all general data
+    storage.delete('authToken');
+    storage.delete('userId');
+    storage.delete('lastUserId');
+    storage.delete('userLang');
+    storage.delete('offlineMode');
+    storage.delete('syncInterval');
+
+    // Save cleared storage
+    storage.save();
+
+    // Delete database file
+    const userDataPath: string = app.getPath('userData');
+    const dbPath: string = path.join(userDataPath, 'eritors-local.db');
+    if (fs.existsSync(dbPath)) {
+      fs.unlinkSync(dbPath);
+    }
+
+    // Delete secure config file to ensure complete reset
+    const secureConfigPath: string = path.join(userDataPath, 'secure-config.json');
+    if (fs.existsSync(secureConfigPath)) {
+      fs.unlinkSync(secureConfigPath);
+    }
+
+    console.log('[Emergency Restore] All local data cleared successfully');
+  } catch (error) {
+    console.error('[Emergency Restore] Error:', error);
+  }
+
+  // Restart app
+  if (mainWindow) {
+    mainWindow.close();
+    mainWindow = null;
+  }
+  if (loginWindow) {
+    loginWindow.close();
+    loginWindow = null;
+  }
+
+  app.relaunch();
+  app.exit(0);
+}
+
 app.whenReady().then(():void => {
   // Security: Disable web cache in production
   if (!isDev) {
@@ -558,6 +625,29 @@ app.whenReady().then(():void => {
       submenu: [
         { role: 'toggleDevTools' }
       ]
+    },
+    {
+      label: 'Help',
+      submenu: [
+        {
+          label: 'Restore App',
+          click: () => {
+            dialog.showMessageBox({
+              type: 'warning',
+              buttons: ['Cancel', 'Restore'],
+              defaultId: 0,
+              cancelId: 0,
+              title: 'Restore App',
+              message: 'Are you sure you want to restore the app?',
+              detail: 'This will delete all local data including: PIN codes, encryption keys, local database, and authentication tokens. The app will restart after restoration.'
+            }).then((result) => {
+              if (result.response === 1) {
+                performEmergencyRestore();
+              }
+            });
+          }
+        }
+      ]
     }
   ];