- Replace orange accent (#f59f4a) with signature red (#ff4d4d)
- Switch from IBM Plex/Unbounded/Work Sans to Inter/JetBrains Mono
- Replace emoji icons with Lucide-style SVG icons throughout
- Add comprehensive CSS design tokens (colors, borders, semantic states)
- Update tool-display.json to use icon names instead of emoji
- Rebuild control-ui dist bundle
On screens under 1100px, the nav groups were displaying in a confusing
grid-like pattern. This flattens all nav items into a single horizontal
scrollable row using display:contents to unwrap the group containers.
Also fixes the issue where collapsed nav groups would hide items on
mobile (where the toggle button is hidden), making them inaccessible.
