- Add mobile hamburger menu with animated toggle (Header.js)
- Add CopyButton component with clipboard API + toast notifications
- Replace all loading spinners with skeleton loading screens
- Add custom Toast notification system (no new dependencies)
- Add dark/light theme toggle with localStorage persistence
- Use CSS variables for theme-aware colors across all components
- Build compiles successfully with zero warnings
New files: CopyButton.js, Skeleton.js, Toast.js, ThemeContext.js
Modified: All pages and components updated for UX improvements
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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