Add comprehensive UX improvements to color playground:
**URL State Sharing:**
- Implement URL parameter sync for colors
- Add share button to copy playground URLs
- Wrap in Suspense boundary for Next.js 16 compatibility
- Colors persist in URL for easy sharing
**Keyboard Shortcuts:**
- Create reusable useKeyboard hook with modifier support
- Add Cmd/Ctrl+C to copy current color
- Add Cmd/Ctrl+S to share color URL
- Add Cmd/Ctrl+R for random color generation
- Display keyboard hints in playground header
- Cross-platform support (Mac/Windows/Linux)
**Color History:**
- Implement Zustand store with localStorage persistence
- Track up to 50 most recent colors with timestamps
- Auto-deduplicate and keep most recent entry
- Add visual history grid in playground
- Click to restore previous colors
- Individual color removal with hover UI
- Clear all history option
**Playground UI Enhancements:**
- Add visual keyboard shortcut indicators (⌘C, ⌘S, ⌘R)
- Implement Recent Colors section with 5-column grid
- Add hover effects for history color swatches
- Individual remove buttons on hover
- Toast notifications for all actions
- Improved button layout and spacing
**Files Added:**
- lib/hooks/useKeyboard.ts - Keyboard shortcut management
- lib/stores/historyStore.ts - Color history with persistence
**Files Modified:**
- app/playground/page.tsx - Integrated all UX features
Successfully builds with all features working.
Ready for user testing.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
494b2a450b