New Features

- Automatic encrypted backups with BackupWorker
- Backup management: share, delete, and view backup files
- Auto-lock on inactivity for enhanced security
- Password protection for import/export operations
- Toolbar integration in Settings and entry screens

Improvements

- R8 full mode and ProGuard enabled
- Repository pattern for data abstraction
- Lazy initialization of repositories
- WebP launcher icons for smaller app size
- Enhanced UI with dividers and improved padding

Technical

- Updated dependencies
- Removed unused resources and test code