setSpotStatus({}) blanked EVERY spot's status, so logging one contact wiped all
the other NEW/NEW-BAND badges and they popped back a moment later. Instead,
re-fetch the shown spots and OVERWRITE each status in place (merge) — the just-
worked spot updates while the rest stay put, no flicker. Same visibility gate
and 2 s debounce; backend cost is one status batch (one logbook scan) as before.