BUY listings can come back from the API with null `total_price`, `qm`,
`qmprice`, `rooms`, and `last_seen` even though the TypeScript types
declare them non-nullable. The cards called `.toLocaleString()` and
`.split('T')` on those values, throwing TypeError and tripping the
ErrorBoundary — which is the "BUY part of the page crashes" symptom.
Coerce numeric fields via a `safeNum` helper (0 fallback), gate the
"Nd ago" line on a finite last_seen, and apply the same guards in
PropertyCard, PropertyCardCompact, SwipeCard, and the price-history
section of ListingDetail. Added regression tests asserting both card
variants render with all-null backend fields without throwing.
- Add prefers-reduced-motion support (global CSS + SwipeCard spring config)
- Add dismissible map click hint overlay with localStorage persistence
- Replace generic image alt text with descriptive property info across 4 components
- Rename filter buttons to clarify intent (Show Matching Listings / Scrape New from Rightmove)
- Fix mobile FAB overlap with bottom sheet via dynamic snap-aware positioning
- Add swipe review onboarding overlay with gesture explanations and button labels
- Delete unused components: AppSidebar, ActiveQuery, SavedView
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
