feat(mobile): section-nav scroll affordance and drop illegible home previews

MOB-03: The school-detail section nav (SATs / Admissions / Pupils /
Location / History) overflows on phones (scrollWidth 462 vs clientWidth
356) with no signal that more tabs exist past the right edge. Add a
right-edge mask-image fade at ≤640px, scroll-snap on each link, and
bigger tap targets (min-height 36px, padding bumped). A scroll/resize
listener toggles an .atEnd class that removes the fade once the user
has scrolled to the last tab.

MOB-04: The "What you'll see on every school" cards rendered preview
visuals (mini cascade chart, Ofsted badge, compare table) with text
scaled down to 6–10px — unreadable on a phone. Hide .hiwVisual at
≤640px and let the explanatory text carry each card; tiny visible
text count on the home dropped from 51 to 8.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

nextjs-app/components/HomeView.module.css

@@ -1003,6 +1003,24 @@
   }
 }
 
+/* On phones, hide the scaled-down preview visuals (text becomes illegible
+   at this size) and let the explanatory text carry each card. */
+@media (max-width: 640px) {
+  .hiwVisual {
+    display: none;
+  }
+  .hiwCard {
+    padding: 1rem 1.1rem;
+    gap: 0.45rem;
+  }
+  .hiwTitle {
+    font-size: 1.05rem;
+  }
+  .hiwDesc {
+    font-size: 0.9rem;
+  }
+}
+
 /* ── Editorial section ───────────────────────────────── */
 
 .editorial {

nextjs-app/components/SchoolDetailView.module.css

@@ -190,6 +190,8 @@
     -webkit-overflow-scrolling: touch;
     scrollbar-width: none;
     box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
+    scroll-snap-type: x proximity;
+    scroll-padding-inline: 1rem;
 }
 
 .sectionNav::-webkit-scrollbar {
@@ -202,6 +204,21 @@
     align-items: center;
 }
 
+/* Right-edge fade so users see there's more to scroll to. */
+@media (max-width: 640px) {
+    .sectionNav {
+        -webkit-mask-image: linear-gradient(to right, #000 calc(100% - 28px), transparent);
+                mask-image: linear-gradient(to right, #000 calc(100% - 28px), transparent);
+        padding-right: 1.75rem;
+    }
+
+    /* When scrolled to the end, drop the fade so the last item isn't dimmed. */
+    .sectionNav.atEnd {
+        -webkit-mask-image: none;
+                mask-image: none;
+    }
+}
+
 .sectionNavBack {
     display: inline-flex;
     align-items: center;
@@ -232,7 +249,8 @@
 }
 
 .sectionNavLink {
-    display: inline-block;
+    display: inline-flex;
+    align-items: center;
     padding: 0.3rem 0.625rem;
     font-size: 0.75rem;
     font-weight: 500;
@@ -241,6 +259,16 @@
     border-radius: 4px;
     transition: all 0.15s ease;
     white-space: nowrap;
+    scroll-snap-align: start;
+}
+
+@media (max-width: 640px) {
+    .sectionNavLink,
+    .sectionNavBack {
+        min-height: 36px;
+        padding: 0.5rem 0.75rem;
+        font-size: 0.8125rem;
+    }
 }
 
 .sectionNavLink:hover {

nextjs-app/components/SchoolDetailView.tsx

@@ -5,7 +5,7 @@
 
 'use client';
 
-import { useEffect, useState } from 'react';
+import { useEffect, useRef, useState } from 'react';
 import { useRouter } from 'next/navigation';
 import { useComparison } from '@/hooks/useComparison';
 import { PerformanceChart } from './PerformanceChart';
@@ -75,6 +75,29 @@ export function SchoolDetailView({
   const isInComparison = isSelected(schoolInfo.urn);
 
   const [activeSection, setActiveSection] = useState<string>('');
+  const sectionNavRef = useRef<HTMLElement | null>(null);
+  const [sectionNavAtEnd, setSectionNavAtEnd] = useState(false);
+
+  useEffect(() => {
+    const el = sectionNavRef.current;
+    if (!el) return;
+    const update = () => {
+      const overflow = el.scrollWidth - el.clientWidth;
+      // No overflow → treat as "at end" so the fade is hidden.
+      if (overflow <= 1) {
+        setSectionNavAtEnd(true);
+        return;
+      }
+      setSectionNavAtEnd(el.scrollLeft >= overflow - 2);
+    };
+    update();
+    el.addEventListener('scroll', update, { passive: true });
+    window.addEventListener('resize', update);
+    return () => {
+      el.removeEventListener('scroll', update);
+      window.removeEventListener('resize', update);
+    };
+  }, []);
 
   const latestResults = yearlyData.length > 0 ? yearlyData[yearlyData.length - 1] : null;
 
@@ -356,7 +379,11 @@ export function SchoolDetailView({
       </header>
 
       {/* Sticky Section Navigation */}
-      <nav className={styles.sectionNav} aria-label="Page sections">
+      <nav
+        ref={sectionNavRef}
+        className={`${styles.sectionNav}${sectionNavAtEnd ? ` ${styles.atEnd}` : ''}`}
+        aria-label="Page sections"
+      >
         <div className={styles.sectionNavInner}>
           <button onClick={() => router.back()} className={styles.sectionNavBack}>← Back</button>
           {navItems.length > 0 && <div className={styles.sectionNavDivider} />}