fix(compare): mobile measure-first cards to match the mockup

The grid sections (At a glance, Ofsted, Getting a place, Who goes there)
collapsed generically on mobile — grey label pills, full names wrapping
to 3 lines, no dots — making the page ~2x the mockup's height and
'significantly different' from the mobile design.

Each measure is now wrapped in a <Measure> that is display:contents on
desktop (so the label + cells still flow into the shared aligned grid,
unchanged) and a white card on mobile with compact [dot][short name]
[value] rows — matching the mobile mockup. The sticky school bar becomes
scrollable short-name pills on mobile too. Adds a shortName() util.

Desktop layout is unchanged (display:contents dissolves the wrapper).
Validated the card mechanism and real content shapes (report-card cell,
badges, %+chip rows) via static previews at both widths.

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

nextjs-app/components/compare/CompareAdmissions.tsx

@@ -10,7 +10,7 @@
 import { summariseAdmissions } from '@/lib/compareLogic';
 import type { ComparisonData, School } from '@/lib/types';
 import { CHART_COLORS } from '@/lib/utils';
-import { Cell, Chip, RowLabel, Section, SectionGrid, sectionStyles as s } from './sectionShared';
+import { Cell, Chip, Measure, Section, SectionGrid, sectionStyles as s } from './sectionShared';
 
 export function CompareAdmissions({
   schools,
@@ -49,9 +49,10 @@ export function CompareAdmissions({
       }
     >
       <SectionGrid schools={schools}>
-        <RowLabel tip="How many application forms named the school at any preference rank — not the number of families competing head-to-head for a place.">
-          Interest in the school
-        </RowLabel>
+        <Measure
+          tip="How many application forms named the school at any preference rank — not the number of families competing head-to-head for a place."
+          label="Interest in the school"
+        >
         {schools.map((school, i) => {
           const a = rows[i];
           return (
@@ -68,7 +69,9 @@ export function CompareAdmissions({
           );
         })}
 
-        <RowLabel>First-choice families offered a place</RowLabel>
+        </Measure>
+
+        <Measure label="First-choice families offered a place">
         {schools.map((school, i) => {
           const summary = summariseAdmissions(rows[i]);
           return (
@@ -95,7 +98,9 @@ export function CompareAdmissions({
           );
         })}
 
-        <RowLabel>What this means</RowLabel>
+        </Measure>
+
+        <Measure label="What this means">
         {schools.map((school, i) => {
           const a = rows[i];
           const summary = summariseAdmissions(a);
@@ -118,6 +123,7 @@ export function CompareAdmissions({
             </Cell>
           );
         })}
+        </Measure>
       </SectionGrid>
     </Section>
   );