fix(awards): stack the reference validity dates, and prove the award fallback

Two dates side by side put each one in a half-width Field2, which spends 120px
on its label column — the second label overlapped the first input and the row
ran off the panel. The comment ten lines above says exactly this about the
group/subgroup fields; one per row, as everything else in this editor.

Also shows a far-future end date as open-ended. RDA carries 9999-12-31 as "no
end" and printing it back reads like a real deadline.

The claim that an empty per-reference window inherits the award's is now a
test rather than a comment: a QSO before the award's own ValidFrom does not
count for a reference that has no window of its own, and a narrower reference
window still applies on top.

frontend/src/components/AwardEditor.tsx

@@ -97,6 +97,13 @@ function Chips({ all, value, onToggle }: { all: string[]; value: string[]; onTog
   );
 }
 
+// Awards use a far-future date as "no end" (RDA carries 9999-12-31). Printing it
+// back at the operator reads like a real deadline, so show it as open-ended.
+function openEnded(d?: string): string {
+  if (!d) return '—';
+  return /^9\d{3}-/.test(d) ? '—' : d;
+}
+
 function Field2({ label, children }: { label: string; children: React.ReactNode }) {
   return (
     <div className="grid grid-cols-[120px_1fr] items-center gap-2">
@@ -1064,19 +1071,17 @@ function ReferencesPanel({ code, presets, meta, awardValidFrom, awardValidTo, on
                   Left empty the award's own dates govern, which is why they show
                   as the placeholder: the operator can see what "empty" inherits
                   instead of having to remember. */}
-              <div className="grid grid-cols-2 gap-2">
-                <Field2 label={t('awed.refValidFrom')}>
-                  <Input type="date" className="h-8" value={sel.valid_from ?? ''}
-                    onChange={(e) => patchSel({ valid_from: e.target.value })} />
-                </Field2>
-                <Field2 label={t('awed.refValidTo')}>
-                  <Input type="date" className="h-8" value={sel.valid_to ?? ''}
-                    onChange={(e) => patchSel({ valid_to: e.target.value })} />
-                </Field2>
-              </div>
+              <Field2 label={t('awed.refValidFrom')}>
+                <Input type="date" className="h-8 w-44" value={sel.valid_from ?? ''}
+                  onChange={(e) => patchSel({ valid_from: e.target.value })} />
+              </Field2>
+              <Field2 label={t('awed.refValidTo')}>
+                <Input type="date" className="h-8 w-44" value={sel.valid_to ?? ''}
+                  onChange={(e) => patchSel({ valid_to: e.target.value })} />
+              </Field2>
               <p className="text-xs text-muted-foreground">
                 {(awardValidFrom || awardValidTo)
-                  ? t('awed.refValidHintAward', { from: awardValidFrom || '—', to: awardValidTo || '—' })
+                  ? t('awed.refValidHintAward', { from: openEnded(awardValidFrom), to: openEnded(awardValidTo) })
                   : t('awed.refValidHint')}
               </p>
               <div className="flex justify-end pt-1"><Button size="sm" className="h-7" onClick={() => sel && saveRef(sel)}><Save className="size-3.5 mr-1" /> {t('awed.saveReference')}</Button></div>