- Skip fly-to animation on initial data load (fitBounds duration: 0)
- Replace turf.hexGrid with origin-anchored manual hex generation so
hexagons stay stable across pan/zoom instead of flickering
- Quantize zoom to integers so hex pattern only changes at discrete levels
- Scale search radius with cell size so low-zoom hexagons find their data
- Make hexagons clickable with pointer cursor; each hex shows the exact
listings it aggregated via stored search bounds
- Remove unused SEARCH_BUFFER constant
