- Set up class-based dark mode in Tailwind config
- Add pre-hydration dark mode application to avoid theme flash on initial load
- Implement accessible dark mode toggle in settings page
- Update all UI surfaces (headers, bottom nav, maps) with dark mode color schemes
- Add comprehensive global CSS overrides for arbitrary Tailwind classes
- Add brand accent strips to header and bottom nav for consistent visual framing
- Refine map waypoint styling: reduce dot size, update label positioning and styling
