- Add "Search by city" toggle as alternative to GPS location
- Replace saved cafes button list with select dropdown
- Show editable review form when selecting a Foursquare result
- Guard all datastar-fetch handlers with in-progress signals
- Fix step indicator spacing (mt-4 on steps 2 and 3)
- Add POST /api/v1/check-in endpoint with CheckInSubmission
- nearby_cafes returns HTML fragment for Datastar, JSON for API
- Add NearbyCafeView and NearbyCafesFragment for server-rendered results
- Rewrite checkin.html: replace checkin.js with Datastar signals,
@post for submission, @get for nearby search, inline geolocation JS
- Cafe filtering uses data-show with signal-based search
