feat: Add database migration tools and fix Electron integration

- Add comprehensive IndexedDB to SQLite migration service (1,397 lines)
- Create migration UI with progress tracking and validation (1,492 lines)
- Fix Electron TypeScript compilation and SQLite plugin issues
- Expand migration system with detailed documentation and error handling
- Add development guide and coding standards

Resolves: #electron-startup #database-migration #typescript-errors
Impact: Enables user-friendly database migration with full data verification

electron/electron-builder.config.json

@@ -45,7 +45,7 @@
   "win": {
     "target": [
       {
-        "target": "nsis",
+    "target": "nsis",
         "arch": ["x64"]
       }
     ],

electron/src/index.ts

@@ -80,7 +80,7 @@ autoUpdater.on('error', (error) => {
   // Only check for updates in production builds, not in development or AppImage
   if (!electronIsDev && !process.env.APPIMAGE) {
     try {
-      autoUpdater.checkForUpdatesAndNotify();
+  autoUpdater.checkForUpdatesAndNotify();
     } catch (error) {
       console.log('Update check failed (suppressed):', error);
     }