fix(ui): remove duplicate data, merge sections, add sticky nav

UX audit round 2:
- Remove Summary Strip (duplicated Ofsted grade + parent happy/safe/recommend)
- Fold "% would recommend" into Ofsted section header
- Merge SATs Results + Subject Breakdown into one section
- Merge Results Over Time chart + Year-by-Year table into one section
- Add sticky section nav with dynamic pills based on available data
- Unify colour system: replace ad-hoc pill colours with semantic status classes
- Guard Pupils & Inclusion so it only renders with actual data
- Add year to Admissions section title
- Fix progress score 0.0 colour (was neutral gap at ±0.1, now at 0)
- Remove unused .metricTrend CSS class

Page reduced from 16 to 13 sections.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

nextjs-app/components/SchoolDetailView.module.css

@@ -8,7 +8,7 @@
   border: 1px solid var(--border-color, #e5dfd5);
   border-radius: 10px;
   padding: 1.25rem 1.5rem;
-  margin-bottom: 1rem;
+  margin-bottom: 0;
   box-shadow: var(--shadow-soft);
 }
 
@@ -117,41 +117,51 @@
   opacity: 0.9;
 }
 
-/* Quick Summary Strip */
-.summaryStrip {
-  display: flex;
-  gap: 0.625rem;
-  flex-wrap: wrap;
-  margin: 0 0 1.25rem;
+/* ── Sticky Section Navigation ──────────────────────── */
+.sectionNav {
+  position: sticky;
+  top: 0;
+  z-index: 10;
+  background: var(--bg-card, white);
+  border: 1px solid var(--border-color, #e5dfd5);
+  border-top: none;
+  border-radius: 0 0 10px 10px;
+  padding: 0.5rem 1rem;
+  margin-bottom: 1rem;
+  overflow-x: auto;
+  white-space: nowrap;
+  -webkit-overflow-scrolling: touch;
+  scrollbar-width: none;
+  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
 }
 
-.summaryPill {
-  padding: 0.35rem 0.875rem;
-  border-radius: 999px;
-  font-size: 0.8125rem;
-  font-weight: 600;
+.sectionNav::-webkit-scrollbar {
+  display: none;
+}
+
+.sectionNavInner {
   display: inline-flex;
-  align-items: center;
-  gap: 0.3rem;
+  gap: 0.375rem;
 }
 
-.summaryPillGood {
-  background: #d1fae5;
-  color: #065f46;
+.sectionNavLink {
+  display: inline-block;
+  padding: 0.3rem 0.625rem;
+  font-size: 0.75rem;
+  font-weight: 500;
+  color: var(--text-secondary, #5c564d);
+  text-decoration: none;
+  border-radius: 4px;
+  transition: all 0.15s ease;
+  white-space: nowrap;
 }
 
-.summaryPillWarn {
-  background: #fef3c7;
-  color: #92400e;
+.sectionNavLink:hover {
+  background: var(--bg-secondary, #f3ede4);
+  color: var(--text-primary, #1a1612);
 }
 
-.summaryPillBad {
-  background: #fee2e2;
-  color: #991b1b;
-}
-
-/* Unified card — replaces summary / chartsSection / detailedMetrics /
-   absenceSection / historySection / supplementarySection / mapSection */
+/* Unified card for all content sections */
 .card {
   background: var(--bg-card, white);
   border: 1px solid var(--border-color, #e5dfd5);
@@ -159,6 +169,7 @@
   padding: 1.25rem 1.5rem;
   margin-bottom: 1rem;
   box-shadow: var(--shadow-soft);
+  scroll-margin-top: 3.5rem;
 }
 
 /* Section Title */
@@ -192,7 +203,7 @@
   margin: -0.5rem 0 1rem;
 }
 
-/* Response count badge (used in "What Parents Say") */
+/* Response count badge */
 .responseBadge {
   font-size: 0.75rem;
   font-weight: 500;
@@ -211,6 +222,18 @@
   margin: 1.25rem 0 0.75rem;
 }
 
+/* Parent recommendation line in Ofsted section */
+.parentRecommendLine {
+  font-size: 0.85rem;
+  color: var(--text-secondary, #5c564d);
+  margin: 0.5rem 0 0;
+}
+
+.parentRecommendLine strong {
+  color: var(--accent-teal, #2d7d7d);
+  font-weight: 700;
+}
+
 /* Metrics Grid & Cards */
 .metricsGrid {
   display: grid;
@@ -252,11 +275,6 @@
   font-style: italic;
 }
 
-.metricTrend {
-  font-size: 1rem;
-  color: var(--accent-teal, #2d7d7d);
-}
-
 /* Progress score colour coding */
 .progressPositive {
   color: var(--accent-teal, #2d7d7d);
@@ -268,6 +286,22 @@
   font-weight: 700;
 }
 
+/* ── Semantic status colours (unified) ────────────── */
+.statusGood {
+  background: rgba(45, 125, 125, 0.10);
+  color: var(--accent-teal, #2d7d7d);
+}
+
+.statusWarn {
+  background: rgba(201, 162, 39, 0.12);
+  color: #b8920e;
+}
+
+.statusBad {
+  background: rgba(224, 114, 86, 0.12);
+  color: var(--accent-coral, #e07256);
+}
+
 /* Charts Section */
 .chartContainer {
   width: 100%;
@@ -339,6 +373,12 @@
   margin-top: 0.5rem;
 }
 
+.historicalSubtitle {
+  font-size: 0.8rem;
+  color: var(--text-muted, #8a847a);
+  margin: 1.25rem 0 0.25rem;
+}
+
 .dataTable {
   width: 100%;
   border-collapse: collapse;
@@ -468,7 +508,7 @@
   color: var(--text-primary, #1a1612);
 }
 
-/* Admissions badges */
+/* Admissions badge — uses unified status colours */
 .admissionsBadge {
   display: inline-flex;
   align-items: center;
@@ -480,16 +520,6 @@
   margin-top: 0.75rem;
 }
 
-.admissionsBadgeWarn {
-  background: rgba(201, 162, 39, 0.15);
-  color: #b8920e;
-}
-
-.admissionsBadgeGood {
-  background: rgba(60, 140, 60, 0.12);
-  color: #3c8c3c;
-}
-
 /* Deprivation dot scale */
 .deprivationDots {
   display: flex;