fix(list/map): badge report-card schools as Report Card, not their carried-forward grade

The search-result cards and map pins keyed report-card detection off
ofsted_framework === 'ReportCard', but the API sets ofsted_framework to the
raw event grouping ('Schools - S5'); worse, ofsted_grade (the carried-forward
legacy grade) was checked first and won. So report-card schools were badged
by their old grade — Barclay's pin/card read 'Outstanding · 2021' instead of
'Report Card · 2026'. Same root cause as the detail-page fix, different
surface.

Expose ofsted_rc_date on the list serialization (the report-card inspection
date, non-null only for report cards) and make both badge builders treat a
present rc-date as winning over any grade, using its year. Removes the dead
framework === 'ReportCard' branches.

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

nextjs-app/components/LeafletMapInner.tsx

@@ -43,6 +43,13 @@ interface PopupBadge {
 }
 
 function buildPopupBadge(school: School): PopupBadge {
+  // A report card wins over any carried-forward legacy grade — its presence is
+  // signalled by ofsted_rc_date (the list has no full report_card object, and
+  // ofsted_framework is the raw event grouping, never "ReportCard").
+  if (school.ofsted_rc_date) {
+    const rcYear = new Date(school.ofsted_rc_date).getFullYear();
+    return { label: `Report Card · ${rcYear}`, style: 'background:#5a3a6e;color:#fff' };
+  }
   const year = school.ofsted_date ? new Date(school.ofsted_date).getFullYear() : null;
   const yearStr = year ? ` · ${year}` : '';
   if (school.ofsted_grade) {
@@ -55,9 +62,6 @@ function buildPopupBadge(school: School): PopupBadge {
     };
     return { label: `${labels[school.ofsted_grade]}${yearStr}`, style: colours[school.ofsted_grade] };
   }
-  if (school.ofsted_framework === 'ReportCard') {
-    return { label: `Report Card${yearStr}`, style: 'background:#5a3a6e;color:#fff' };
-  }
   return { label: 'Not yet inspected', style: 'background:#e0e0e0;color:#666' };
 }