feat(ui): sixth-form badge, note and filter labels use GIAS flag

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

nextjs-app/components/FilterBar.tsx

@@ -368,8 +368,8 @@ export function FilterBar({
                     disabled={isPending}
                   >
                     <option value="">With or without sixth form</option>
-                    <option value="yes">With sixth form (11-18)</option>
-                    <option value="no">Without sixth form (11-16)</option>
+                    <option value="yes">With sixth form</option>
+                    <option value="no">Without sixth form</option>
                   </select>
 
                   {admissionsPolicyOptions.length > 0 && (

nextjs-app/components/SecondarySchoolDetailView.tsx

@@ -98,7 +98,8 @@ export function SecondarySchoolDetailView({
 
   const secondaryAvg = nationalAvg?.secondary ?? {};
 
-  const hasSixthForm = schoolInfo.age_range?.includes('18') ?? false;
+  // GIAS OfficialSixthForm flag; missing (pipeline not yet re-run) => false.
+  const hasSixthForm = schoolInfo.has_sixth_form ?? false;
   const hasFinance = finance != null && finance.per_pupil_spend != null;
   const hasDeprivation = deprivation != null && deprivation.idaci_decile != null;
   const hasLocation = schoolInfo.latitude != null && schoolInfo.longitude != null;

nextjs-app/components/SecondarySchoolRow.tsx

@@ -23,7 +23,8 @@ function detectAdmissionsTag(school: School): string | null {
 }
 
 function hasSixthForm(school: School): boolean {
-  return school.age_range?.includes('18') ?? false;
+  // GIAS OfficialSixthForm flag; missing (pipeline not yet re-run) => false.
+  return school.has_sixth_form ?? false;
 }
 
 interface SecondarySchoolRowProps {