feat(web): add QueryErrorBoundary and use real map coordinates

Add global QueryErrorResetBoundary wrapping the app so TanStack Query
errors are caught with a retry UI instead of crashing. Enable
throwOnError in QueryClient defaults. Update ListingMap to use real
latitude/longitude from API when available, falling back to city-based
jitter for listings without coordinates.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/lib/query-client.ts

@@ -11,6 +11,7 @@ function makeQueryClient() {
         retry: 3,
         retryDelay: (attemptIndex) => Math.min(1000 * 2 ** attemptIndex, 30000),
         refetchOnWindowFocus: false,
+        throwOnError: true,
       },
       mutations: {
         retry: 1,