fix(bandmap): name the new prefix and new grid in the tooltip

The strip deliberately shows three markers of five — the pill is 22 px and a
fourth segment makes it a colour code nobody reads. But the tooltip has room and
was filtering them out too, so the same spot read NEW PFX in the cluster and
'Worked (this band + mode already in log)' on the map. Both were true: the
entity is worked on that slot and the WPX prefix never has been. Neither view
said so.

frontend/src/components/BandMap.tsx

@@ -737,7 +737,7 @@ export function BandMap({ band, spots, spotStatus: spotStatusRaw, currentFreqHz,
                   'hover:translate-x-0.5 hover:shadow',
                   style.pill,
                 )}
-                title={`${p.spot.dx_call}${entry?.country ? ' · ' + entry.country : ''} · ${p.spot.freq_khz.toFixed(1)} kHz · ${statusLabel(st, t)}${markersFor(entry).map((m) => ' · ' + t(BMP_MARKER_LABEL[m.key])).join('')}${p.spot.comment ? ' · ' + p.spot.comment : ''}${p.spot.spotter ? ' · de ' + p.spot.spotter : ''}`}
+                title={`${p.spot.dx_call}${entry?.country ? ' · ' + entry.country : ''} · ${p.spot.freq_khz.toFixed(1)} kHz · ${statusLabel(st, t)}${activeMarkers(entry).map((m) => ' · ' + t(BMP_MARKER_LABEL[m.key])).join('')}${p.spot.comment ? ' · ' + p.spot.comment : ''}${p.spot.spotter ? ' · de ' + p.spot.spotter : ''}`}
               >
                 {/* Left accent strip. With no extra marker it repeats the status
                     colour, exactly as before; otherwise it splits into one