Rover.update_location/3 and delete_location/2 now resolve any record
when the actor is_admin. The index + show LiveViews surface Edit/Delete
on every row for admin users, matching the existing owner UX.
Each row now has a View link (and the location cell links too) to a
new show LiveView that renders the full record alongside a Leaflet
map centered on the marker. Owners get a Delete button there as well.
