Add mobile-responsive design with full feature parity:
- Bottom sheet (vaul) with 3 snap points for map+list coexistence
- Swipeable property cards with horizontal scroll-snap
- Hamburger menu with health, tasks, user info
- Full-screen map with repositioned legend (top-left on mobile)
- Filter FAB opening Sheet drawer
- TaskProgressDrawer from bottom on mobile
- All changes gated behind useIsMobile() hook (768px breakpoint)
- Desktop layout completely untouched
New components: MobileBottomSheet, SwipeableCardRow,
PropertyCardCompact, MobileMenu
Also fixes: idempotent longitude migration, React hooks order
