Enable cron data import and UI/a11y tweaks

Uncomment and enable the cron data collection logic in app/api/cron/route.ts so places are fetched and today's records are upserted into the DB. Add small accessibility and UX improvements: include sr-only labels for map/building/parcel toggle buttons in app/page.tsx and search triggers in components/search.tsx, wrap the close button with an accessible label, and disable the search button (with disabled styling) when all search fields are empty. Also add commented-out zoom state/effect scaffolding in components/Map.tsx for future responsive zoom handling.
