- Add mobile-first navigation with hamburger menu and top-right controls
- Implement accordion-style mobile menu matching sidebar structure
- Add theme toggle and accessibility buttons to mobile header
- Update responsive breakpoints to lg: (1024px) for better tablet/desktop split
- Hide sidebar on mobile, show primary nav on desktop
- Update content padding to use proportional CHORUS spacing system
- Fix logo centering in 3D canvas with proper origin calculations
- Lighten header and bottom dock transparency to 80%
- Add route-aware navigation state management
- Include visual aid modal accessible from mobile menu
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Co-Authored-By: Claude <noreply@anthropic.com>
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