- Add ThemeContext with support for dark, gray, light, and custom themes
- Create theme switching UI in Settings with theme selector
- Add custom color editor for custom theme mode
- Update styles.css with theme-specific CSS variables
- Add theme storage API methods for persistence
- Update syntax highlighting to match selected theme
- Wrap App with ThemeProvider for global theme access
The theming system allows users to switch between predefined themes
or create their own custom theme with live color editing.
