feat: wheel over RST; PSK Reporter keeps the band's window

The mouse wheel steps the RST fields — one S-unit on an RST or RS, one
decibel on a digital report, up for a better one — in the entry strip and
in the QSO editor. The dropdown beside them lists the reports worth
having to hand, not all 41 decibels, so the wheel works on the value
rather than walking the list. The listener is native and non-passive:
React attaches onWheel passively, where preventDefault does nothing and
the panel scrolls away under the field being adjusted.

PSK Reporter, whole-band scope: clicking a decode reset the report count
to zero. The window there is the BAND's — every FTx report on it,
filtered by target only when the analysis is drawn — and it was emptied
on every target change, throwing away an hour of evidence at the moment
the operator asked the question it answers. The narrow scope still clears
it: there the window is one station's, and keeping it would answer the
new question with the old station's evidence.

frontend/src/App.tsx

@@ -150,6 +150,7 @@ import { cn } from '@/lib/utils';
 import { pathBetween, pathBetweenLatLon, gridToLatLon, latLonToGrid } from '@/lib/maidenhead';
 import { flagURL } from '@/lib/flags';
 import { LogViewer } from '@/components/LogViewer';
+import { stepRST } from '@/lib/rst';
 
 type QSO = QSOForm;
 type ImportResult = adifModels.ImportResult;
@@ -5480,12 +5481,19 @@ export default function App() {
   );
   const rstTxBlock = (
     <div className="flex flex-col w-20" data-esm="rsttx"><Label className="mb-1 h-3.5">{t('field.rstTx')}</Label>
-      <Combobox value={rstSent} options={rstOptions(mode, rstLists)} commitOnType onChange={(v) => { setRstSent(v); rstUserEditedRef.current = true; }} />
+      {/* The wheel steps the report — an S-unit on RST, a decibel on a digital
+          one. Wheeling is the same gesture as saying "he is a bit stronger than
+          that", and it beats retyping three characters between overs. */}
+      <Combobox value={rstSent} options={rstOptions(mode, rstLists)} commitOnType
+        onChange={(v) => { setRstSent(v); rstUserEditedRef.current = true; }}
+        onWheelStep={(d) => { setRstSent((v) => stepRST(v, d, mode)); rstUserEditedRef.current = true; }} />
     </div>
   );
   const rstRxBlock = (
     <div className="flex flex-col w-20" data-esm="rstrx"><Label className="mb-1 h-3.5">{t('field.rstRx')}</Label>
-      <Combobox value={rstRcvd} options={rstOptions(mode, rstLists)} commitOnType onChange={(v) => { setRstRcvd(v); rstUserEditedRef.current = true; }} />
+      <Combobox value={rstRcvd} options={rstOptions(mode, rstLists)} commitOnType
+        onChange={(v) => { setRstRcvd(v); rstUserEditedRef.current = true; }}
+        onWheelStep={(d) => { setRstRcvd((v) => stepRST(v, d, mode)); rstUserEditedRef.current = true; }} />
     </div>
   );
   // DX country flag, shown large next to RST (moved here from the Country field).