fix(web): resolve all 22 TypeScript typecheck errors in apps/web (TEC-3208)

- Fix TS4111: use bracket notation for index signature access in metadata.spec.ts,
  neighborhood-poi-map.tsx, and neighborhood-poi-map.spec.tsx
- Fix TS2740: add missing property fields (usableAreaM2, floor, totalFloors,
  nearbyPOIs, etc.) to test mock objects in 5 spec files
- Fix TS2339: add missing estimate() and create() methods to transferApi
- Fix TS4114: add override modifier to render() in page.tsx error boundary
- Fix TS2532: add optional chaining for possibly undefined features in
  neighborhood-poi-map.tsx

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

apps/web/app/[locale]/(public)/page.tsx

@@ -71,7 +71,7 @@ class SectionErrorBoundary extends React.Component<
     return { hasError: true };
   }
 
-  render() {
+  override render() {
     if (this.state.hasError) {
       return (
         <div className="flex items-center gap-2 rounded-md border border-border bg-background-surface p-4 text-sm text-foreground-muted">