- 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