✨ New CollectionSelectionModal Component:
- Multi-select collection interface with search functionality
- Visual card previews showing selected cards to add
- Select all/deselect all functionality for bulk operations
- Real-time collection filtering and search
- Professional modal design with dark mode support
🔗 Integration with Cards Page:
- Bulk selection toolbar now opens collection modal
- Individual card actions trigger collection modal
- Success feedback with detailed results
- Automatic selection clearing after successful additions
🎮 Enhanced Card Detail Page:
- Replaced old single-select dropdown with new modal
- Multi-collection support for single cards
- Automatic refresh of card collections after additions
- Consistent UI across all card interaction points
🎨 User Experience Features:
- Visual card thumbnails in modal header
- Collection metadata display (card count, public status)
- Loading states and error handling
- Responsive design for all screen sizes
Ready for seamless card-to-collection workflow! 📦✨
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