Integrate offline support and improve error handling across app

- Add `OfflineContext` to manage offline state and interactions within components.
- Refactor session logic in `ScribeControllerBar` and `page.tsx` to handle offline scenarios (e.g., check connectivity before enabling GPT features).
- Enhance offline PIN setup and verification with better flow and error messaging.
- Optimize database IPC handlers to initialize and sync data in offline mode.
- Refactor code to clean up redundant logs and ensure stricter typings.
- Improve consistency and structure in handling online and offline operations for smoother user experience.

electron/ipc/offline.ipc.ts

@@ -2,6 +2,7 @@ import { ipcMain } from 'electron';
 import { createHandler } from '../database/LocalSystem.js';
 import * as bcrypt from 'bcrypt';
 import { getSecureStorage } from '../storage/SecureStorage.js';
+import { getDatabaseService } from '../database/database.service.js';
 
 interface SetPinData {
   pin: string;
@@ -62,6 +63,17 @@ ipcMain.handle('offline:pin:verify', async (_event, data: VerifyPinData) => {
     if (isValid) {
       // Set userId for session
       storage.set('userId', lastUserId);
+
+      // Initialize database for offline use
+      const encryptionKey = storage.get<string>(`encryptionKey-${lastUserId}`);
+      if (encryptionKey) {
+        const db = getDatabaseService();
+        db.initialize(lastUserId, encryptionKey);
+      } else {
+        console.error('[Offline] No encryption key found for user');
+        return { success: false, error: 'No encryption key found' };
+      }
+
       console.log('[Offline] PIN verified, user authenticated locally');
       return {
         success: true,