Major improvements:
- Single 'add ui' command replaces individual component selection
- Complete UI library installation with one command
- Enhanced init with astro-icon integration
- Automatic dependency detection and installation
- Simplified workflow: init -> add ui -> done

Features:
- 59+ components across 8 categories
- Full Astro + Alpine.js + Tailwind integration
- Copy-paste component ownership model
- GitHub-based registry system
- Updated diff command for new architecture