- Update primary blue from Linear style (#3498db) to macOS system blue (#0A84FF)
- Align gray scale with macOS dark mode palette (#1C1C1E, #2C2C2E, etc.)
- Adjust dark mode background to match macOS systemBackground (HSL 240 5% 12%)
- Refine scrollbar colors to use native macOS gray tones
- Remove transparent titleBarStyle for better stability
- Add useDarkMode hook for managing theme state and persistence
- Integrate dark mode toggle button in app header
- Update all components with dark variant styles using Tailwind v4
- Create centralized style utilities for consistent theming
- Support system color scheme preference as fallback
- Store user preference in localStorage for persistence
- Replace all CSS custom properties with Tailwind utility classes
- Add tailwind.config.js with custom color palette matching Linear design
- Reduce index.css from 89 to 37 lines (58% reduction)
- Maintain consistent visual appearance with semantic color usage
- Update all components to use Tailwind classes instead of CSS variables