fix(detail): banded first-choice interpretation + plain-English P8 absence copy

Batch C (points 7-10):
- Point 7: the admissions section shows the first-choice offer rate but no
  sense of how severe a low rate is. Reuse the compare screen's banded
  summariseAdmissions ('More than half of first choices missed out' etc.)
  as an interpretive line under the tiles. (Selective/faith framing was
  already present via admissionsTag.)
- Point 8: replace the jargon P8-suspended banner ('not used for
  accountability purposes ... treat with caution') with the compare
  screen's plain-English 'no KS2 baseline (COVID)' explanation.
- Points 9 (disadvantaged cohort sizes) and 10 (FSM benchmark) don't apply
  to the detail page: it shows disadvantaged composition, not disadvantaged
  attainment, and no FSM-vs-benchmark comparison — so there's no small-cohort
  caveat or cross-definition fallback to fix here.
- Also fixed a stray lowercase 'national avg' provenance string Batch B
  missed.

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

nextjs-app/components/SchoolDetailView.tsx

@@ -21,6 +21,7 @@ import {
   formatPercentage, formatProgress, formatAcademicYear, isProposedToClose, ofstedLegacyAreas,
 } from '@/lib/utils';
 import { DeltaChip } from './DeltaChip';
+import { summariseAdmissions } from '@/lib/compareLogic';
 
 const PerformanceChart = dynamic(
   () => import('./PerformanceChart').then((m) => m.PerformanceChart),
@@ -85,6 +86,10 @@ export function SchoolDetailView({
   // Trend toggle only appears with ≥2 years carrying an offer rate.
   const admissionsOfferYears = admissionsHistory.filter((h) => h.first_preference_offer_pct != null).length;
   const showAdmissionsTrend = admissionsOfferYears >= 2;
+  // Banded interpretation of the first-choice offer rate ("More than half of
+  // first choices missed out" etc.) — the same banding the compare screen
+  // uses, so a low offer rate reads as how severe it actually is.
+  const admissionsSummary = summariseAdmissions(admissions);
   // Only the section links scroll horizontally; Back and "All" stay pinned.
   const sectionLinksRef = useRef<HTMLDivElement | null>(null);
   const [sectionNavAtEnd, setSectionNavAtEnd] = useState(false);
@@ -906,6 +911,9 @@ export function SchoolDetailView({
                   </div>
                 )}
               </dl>
+              {admissionsSummary.chip && (
+                <p className={styles.admissionsTrendSummary}>{admissionsSummary.chip.text}</p>
+              )}
             </div>
 
             {/* Multi-year trend */}
@@ -941,7 +949,7 @@ export function SchoolDetailView({
                     <DeltaChip value={latestResults.disadvantaged_pct} baseline={primaryAvg.disadvantaged_pct} unit="pts" size="sm" />
                   )}
                 </div>
-                <div className={styles.heroStatHint}>Pupils from disadvantaged backgrounds{primaryAvg.disadvantaged_pct != null ? ` · national avg: ${primaryAvg.disadvantaged_pct.toFixed(0)}%` : ''}</div>
+                <div className={styles.heroStatHint}>Pupils from disadvantaged backgrounds{primaryAvg.disadvantaged_pct != null ? ` · England avg: ${primaryAvg.disadvantaged_pct.toFixed(0)}%` : ''}</div>
               </div>
             )}
             {latestResults?.eal_pct != null && (

nextjs-app/components/SecondarySchoolDetailView.tsx

@@ -457,7 +457,8 @@ export function SecondarySchoolDetailView({
 
           {p8Suspended && (
             <div className={styles.p8Banner}>
-              Progress 8 scores for 2024/25 are not used for accountability purposes following the KS2 assessment disruption. Treat with caution.
+              Progress 8 isn&apos;t published for 2024/25: this GCSE year group sat no KS2 tests
+              (COVID), so DfE has no starting point to measure their progress from.
             </div>
           )}