- rover_planning_live/show.ex: use pre-loaded @rover_sites assign
instead of Repo.all(Location) on every keystroke
- rover_locations_live/map.ex: cache locations query with 30s TTL
(was loading + JSON-encoding all good locations in every mount)
- status_live.ex: consolidate 5 separate stat fetches into single
cached blob, so PubSub-triggered refreshes hit cache instead of
running 10+ DB queries each time
Adds a full-screen map view rendering every Good rover-location as a
green circle marker (popup links to the detail page). Uses the standard
OSM/Satellite + Maidenhead grid overlay pattern. Bad locations are
excluded. Adds a Map button next to Add location on the index header.
