- Fixed bottom tab bar for mobile (md:hidden) with z-20 stacking
- 4 tabs: Home, Collection, Setups, Search with Lucide icons
- Collection and Setups fire openAuthPrompt for anonymous users
- Search tab calls openCatalogSearch('collection') to open overlay
- Active route highlighting via useMatchRoute
- Framer Motion entry animation (y slide + fade)
- iOS safe area padding with env(safe-area-inset-bottom)
[Rule 1 - Bug] Used 'house' icon instead of 'home': lucide-react has no 'Home' icon (only 'House')
