feat(detail): move religious character into header details + mobile reveal

Religious character now sits with the other labelled header details (near
County / Constituency) as "Religious character: <denomination>" ("None" for
Does not apply / None), instead of as an identity chip.

On mobile/tablet (≤768px) the header details block was hidden outright; it's
now collapsed behind a "Show all details" toggle that reveals the full block
(headteacher, website, pupils, trust, phone, religious character, county,
constituency). Applied to both the primary and secondary detail views for
parity. Extends the e2e journey with the mobile toggle behaviour.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

nextjs-app/components/SchoolDetailView.module.css

@@ -197,6 +197,22 @@
     text-decoration: underline;
 }
 
+/* "Show all details" reveal — only rendered on mobile/tablet, where the
+   header details block is collapsed below the fold. Hidden on desktop. */
+.detailsToggle {
+    display: none;
+    align-items: center;
+    gap: 0.25rem;
+    margin-top: 0.5rem;
+    padding: 0;
+    background: none;
+    border: none;
+    font-size: 0.8125rem;
+    font-weight: 600;
+    color: var(--accent-teal, #2d7d7d);
+    cursor: pointer;
+}
+
 /* Gender split card — sits in the Pupils & Inclusion heroStatGrid */
 .genderSplitValue {
     display: flex;
@@ -1205,14 +1221,24 @@
         gap: 0.375rem;
     }
 
-    /* Secondary header info (headteacher, website, pupil count, trust)
-       isn't needed above the fold on phones — pupil count lives in the
-       Pupils & Inclusion section, website is one scroll away. Reclaim
-       the ~3 vertical lines so the actual metrics surface sooner. */
+    /* Secondary header info (headteacher, website, pupil count, trust,
+       contact, area) isn't needed above the fold on phones/tablets, so it's
+       collapsed by default and revealed on demand via the "Show all details"
+       link — reclaiming the vertical space so the metrics surface sooner. */
+    .detailsToggle {
+        display: inline-flex;
+    }
+
     .headerDetails {
         display: none;
     }
 
+    .headerDetailsOpen {
+        display: flex;
+        flex-direction: column;
+        gap: 0.375rem;
+    }
+
     .metricsGrid {
         grid-template-columns: repeat(2, 1fr);
     }