feat(bandmap,dxped): drop the ctrl+wheel zoom, badge the news

ctrl+wheel is the WINDOW zoom everywhere else in OpsLog, and one gesture
that resizes the whole app over one panel and one band map over another
is a gesture nobody can trust. The + and - buttons keep the zoom, and
the footer hint stops advertising what is gone.

The DX-World headlines now carry a chase badge like the announcements —
but ENTITY-LEVEL only. A headline names no band, and asking the slot
question without one answers 'new band' for every entity ever worked:
the one mistake that costs a QSO. So the news says NEW DXCC or worked,
and the sharper verdicts stay where the bands and modes are known.

frontend/src/components/BandMap.tsx

@@ -471,19 +471,10 @@ export function BandMap({ band, spots, spotStatus: spotStatusRaw, currentFreqHz,
     // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [band, containerH, currentFreqHz, range, lo, hi, pxPerKHz, fitToBand]);
 
-  useEffect(() => {
-    const el = scrollerRef.current;
-    if (!el) return;
-    const onWheel = (e: WheelEvent) => {
-      if (!range) return;
-      if (e.ctrlKey || e.metaKey) {
-        e.preventDefault();
-        changeZoom(e.deltaY > 0 ? -1 : 1);
-      }
-    };
-    el.addEventListener('wheel', onWheel, { passive: false });
-    return () => el.removeEventListener('wheel', onWheel);
-  }, [range]);
+  // No ctrl+wheel zoom here any more: ctrl+wheel is the WINDOW zoom everywhere
+  // else in OpsLog (View ▸ Zoom in/out), and one gesture that resizes the whole
+  // app over one panel and one band map over another is a gesture nobody can
+  // trust. The + / − buttons keep the zoom, deliberately and visibly.
 
   // Ctrl+↑ / Ctrl+↓ hop to the next spot above / below the rig frequency and tune
   // to it. Higher freq is UP on the map (see freqToY), so ↑ = next higher spot.