feat(destinations): the After Year 11 section

Question cards over one bar, with the cards acting as a lens on the bar
rather than a summary beside it — focusing a card dims everything it is
not made of, so the grouping we chose is inspectable rather than asserted.

The bar renders only when canRenderBar allows it. Where a category is
withheld the section says so and shows the table instead: the categories
sum to the cohort, so a bar drawn from the published segments leaves a
gap whose width is the withheld figure.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BvdDKvFFSZuMVDH5fEyTob

nextjs-app/components/school/DestinationsSection.tsx

@@ -0,0 +1,38 @@
+/**
+ * DestinationsSection — where a school's Year 11 leavers went. Server component.
+ *
+ * The headline is deliberately NOT the sustained-destination rate. That figure
+ * sits between 92% and 97% for nearly every school in England, so leading with
+ * it would say nothing; the mix is what actually varies between schools.
+ *
+ * The section dates its own cohort because destination measures are published
+ * about two GCSE years behind the results in the section above — undated, the
+ * figures read as stale rather than as a different question.
+ */
+
+import type { DestinationPhase } from '@/lib/types';
+import { Section, sectionStyles } from './sectionShared';
+import { DestinationsView } from './DestinationsView';
+
+export function DestinationsSection({ destinations }: { destinations: DestinationPhase }) {
+  const all = destinations.groups.all;
+  const hasContent = Object.values(destinations.groups)
+    .some(group => (group?.categories?.length ?? 0) > 0);
+  if (!hasContent) return null;
+
+  const cohort = all?.cohort ?? null;
+  const year = destinations.cohort_year;
+
+  return (
+    <Section id="destinations">
+      <h2 className={sectionStyles.sectionTitle}>After Year 11</h2>
+      <p className={sectionStyles.sectionSubtitle}>
+        Where {cohort ? `the ${cohort} pupils` : 'the pupils'} who left Year 11
+        {year ? ` in ${year}` : ''} were during the following year. The Department
+        for Education tracks leavers for two terms, so these figures cover an
+        earlier year group than the GCSE results above.
+      </p>
+      <DestinationsView destinations={destinations} phase="ks4" />
+    </Section>
+  );
+}