feat(hamlog): read confirmations back from a HAMLOG.online ADIF

Their agent protocol has no download verb, so the return path is a file
exported from their site. Running that file through the ordinary ADIF
import is the wrong tool and does real damage: it matches on callsign +
UTC minute + band + mode, their export is rebuilt from their own
database and rarely agrees to the minute, and 'update duplicates' then
inserts everything that failed to match -- several hundred copies of
contacts already in the log.

This path matches only. It stamps the confirmation on QSOs it finds,
falls back to the mode-CLASS key for the modes their export renames, and
REPORTS what it could not match instead of adding it: an unmatched
confirmation is a question about the log, not a contact to create.

Also logs and reports how many rows a delete actually removed -- silence
there made a delete that did nothing indistinguishable from one that
worked.

frontend/src/components/QSLManagerModal.tsx

@@ -8,7 +8,7 @@ import {
   Select, SelectTrigger, SelectValue, SelectContent, SelectItem,
 } from '@/components/ui/select';
 import { cn } from '@/lib/utils';
-import { FindQSOsForUpload, UploadQSOsManual, DownloadConfirmations, CancelConfirmations, SyncPOTAHunterLog, ListQSO, BulkUpdateQSL, UploadCallsign, GetSlotStats } from '../../wailsjs/go/main/App';
+import { FindQSOsForUpload, UploadQSOsManual, DownloadConfirmations, CancelConfirmations, ImportHamlogConfirmations, OpenADIFFile, SyncPOTAHunterLog, ListQSO, BulkUpdateQSL, UploadCallsign, GetSlotStats } from '../../wailsjs/go/main/App';
 import { Input } from '@/components/ui/input';
 import { RecentQSOsGrid } from '@/components/RecentQSOsGrid';
 import { EventsOn } from '../../wailsjs/runtime/runtime';
@@ -350,6 +350,19 @@ export function QSLManagerPanel({ onEditQSO, actions, paperRequest }: {
     catch (e: any) { setLogLines((p) => [...p, 'Error: ' + String(e?.message ?? e)]); setBusy(false); }
   }
 
+  // HAMLOG.online has no download verb — their agent protocol only uploads —
+  // so confirmations come back as an ADIF exported from their site. It is read
+  // here rather than through the ordinary ADIF import because that one matches
+  // on the UTC minute and INSERTS whatever fails to match: a few hundred copies
+  // of contacts already in the log. This path only ever stamps QSOs it finds.
+  async function importHamlogCfm() {
+    const path = await OpenADIFFile();
+    if (!path) return;
+    setLogLines([]); setBusy(true); setLogAction('download'); setShowLog(true);
+    try { await ImportHamlogConfirmations(path); }
+    catch (e: any) { setLogLines((p) => [...p, 'Error: ' + String(e?.message ?? e)]); setBusy(false); }
+  }
+
   function viewResults() {
     setShowLog(false);
     if (logAction === 'upload') selectRequired();
@@ -666,11 +679,19 @@ export function QSLManagerPanel({ onEditQSO, actions, paperRequest }: {
       {service !== 'pota' && service !== 'paper' && (
       <div className="flex items-center justify-between gap-2 px-3 py-2 border-t border-border bg-muted/20 shrink-0">
         <div className="flex items-center gap-2 flex-wrap">
+          {service === 'hamlog' ? (
+            <Button variant="outline" size="sm" onClick={importHamlogCfm} disabled={busy}
+              title={t('qslm.hamlogImportTitle')}>
+              <DownloadCloud className="size-3.5" /> {t('qslm.hamlogImportCfm')}
+            </Button>
+          ) : (
           <Button variant="outline" size="sm" onClick={download} disabled={busy}
             title={t('qslm.downloadTitle')}>
             <DownloadCloud className="size-3.5" /> {t('qslm.downloadConf')}
           </Button>
+          )}
           {/* Date window */}
+          {service !== 'hamlog' && (<>
           <Select value={sinceMode} onValueChange={(v) => setSinceMode(v as any)}>
             <SelectTrigger className="h-8 w-[150px] text-xs" title={t('qslm.downloadRangeTitle')}>
               <SelectValue />
@@ -694,6 +715,7 @@ export function QSLManagerPanel({ onEditQSO, actions, paperRequest }: {
             <Checkbox checked={addNotFound} onCheckedChange={(c) => setAddNotFound(!!c)} />
             {t('qslm.addNotFound')}
           </label>
+          </>)}
         </div>
         <Button size="sm" onClick={upload} disabled={selectedCount === 0 || busy}>
           <UploadCloud className="size-3.5" /> {t('qslm.uploadTo', { n: selectedCount, service: serviceLabel })}