fix(compare): date report cards with their own inspection date, never the legacy one

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0146VHeLAWjDVE2B5uU67jCB

nextjs-app/components/compare/CompareOfsted.tsx

@@ -180,10 +180,18 @@ export function CompareOfsted({
         <Measure label="Inspected">
         {schools.map((school, i) => {
           const ofsted = data[String(school.urn)]?.ofsted;
-          const age = yearsSince(ofsted?.inspection_date ?? null);
+          // A report card is dated by its OWN inspection date. The legacy
+          // inspection_date belongs to an older inspection and must never
+          // be shown against a report card (report cards exist only from
+          // Nov 2025).
+          const dateIso =
+            displays[i].kind === 'report_card'
+              ? ofsted?.rc_inspection_date ?? null
+              : ofsted?.inspection_date ?? null;
+          const age = yearsSince(dateIso);
           return (
             <Cell key={school.urn} school={school} index={i}>
-              {formatInspectionDate(ofsted?.inspection_date ?? null)}{' '}
+              {formatInspectionDate(dateIso)}{' '}
               {age != null && age > 4 && <Chip tone="neutral">4+ years ago</Chip>}
             </Cell>
           );