feat(lotw): name the station callsign on each downloaded confirmation

With 'All my callsigns' the report spans F4BPO, F4BPO/P and TM2Q at once, and a
list mixing them says nothing about which one a confirmation belongs to — which
is the question that option creates.

The column appears only when the rows actually carry a station: the other
services return one, and an empty column for them would be noise.

frontend/src/components/QSLManagerModal.tsx

@@ -31,7 +31,7 @@ const UPLOAD_COLS: ColDef<UploadRow>[] = [
 ];
 
 type Confirmation = {
-  callsign: string; qso_date: string; band: string; mode: string; country: string;
+  callsign: string; station?: string; qso_date: string; band: string; mode: string; country: string;
   new_dxcc: boolean; new_band: boolean; new_mode: boolean; new_slot: boolean;
 };
 
@@ -619,6 +619,10 @@ export function QSLManagerPanel({ onEditQSO, actions, paperRequest }: {
               <thead className="sticky top-0 bg-card">
                 <tr className="text-left text-muted-foreground border-b border-border">
                   <th className="py-1.5 px-2">{t('qslm.thDateUtc')}</th><th className="py-1.5 px-2">{t('qslm.thCallsign')}</th>
+                  {/* Which of the operator's callsigns the contact was made
+                      under. Only worth a column when the list can hold more than
+                      one — see "All my callsigns" on the download. */}
+                  {shownConfs.some((c) => c.station) && <th className="py-1.5 px-2">{t('qslm.thStation')}</th>}
                   <th className="py-1.5 px-2">{t('qslm.thBand')}</th><th className="py-1.5 px-2">{t('qslm.thMode')}</th>
                   <th className="py-1.5 px-2">{t('qslm.thCountry')}</th><th className="py-1.5 px-2">{t('qslm.thNew')}</th>
                 </tr>
@@ -628,6 +632,9 @@ export function QSLManagerPanel({ onEditQSO, actions, paperRequest }: {
                   <tr key={i} className="border-b border-border/40">
                     <td className="py-1 px-2 font-mono">{fmtDate(c.qso_date)}</td>
                     <td className="py-1 px-2 font-mono font-bold">{c.callsign}</td>
+                    {shownConfs.some((x) => x.station) && (
+                      <td className="py-1 px-2 font-mono text-muted-foreground">{c.station ?? ''}</td>
+                    )}
                     <td className="py-1 px-2">{c.band}</td>
                     <td className="py-1 px-2">{c.mode}</td>
                     <td className="py-1 px-2 text-muted-foreground">{c.country}</td>