feat(mobile): mobile cleanups for deadlines, result cards, tooltips, ofsted, rankings

MOB-07: Admissions deadlines strip becomes a horizontal snap-scroller
on ≤640px instead of a cramped 2×2 grid (which forced "Secondary ·
Deadline" track labels down to 9.6px). Cards stay readable, the right
edge fades to signal more content past the viewport, .chipTrack font
bumped to 0.7rem.

MOB-09: Result-card line3 (headline metric + secondary stats) was
crowding everything onto one row. Force the first .stat (Attainment
8 / RWM headline) to flex-basis 100% on mobile so delta-vs-LA and
pupil count wrap below it with a visible row-gap. Applied to both
SchoolRow (primary) and SecondarySchoolRow.

MOB-12: MetricTooltip ⓘ icons rendered at ~9px and relied on :hover
(which doesn't fire on touch). Hide the whole .wrapper at ≤640px —
metric labels themselves carry the meaning. Saves building a
tap-to-show layer for now.

MOB-13: The "Ofsted pending / No inspection on record" empty state
took a full hero card to communicate non-information. Add a
data-ofsted-state attribute on the hero chip; on ≤640px, the
"none" state collapses to a single muted line.

MOB-17: Already had Type+Action columns hidden on rankings mobile —
no change needed beyond marking complete.

MOB-18: Long metric headers ("Reading, Writing & Maths Combined %")
forced the value column wide. Drop .valueHeader to 0.625rem with
white-space: normal at ≤640px so labels wrap onto 2 short lines.

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

nextjs-app/components/SchoolDetailView.module.css

@@ -1077,6 +1077,20 @@
         min-width: 100%;
     }
 
+    /* Collapse the "Ofsted pending / No inspection on record" empty state
+       into a single compact line on phones — it's a non-result, not worth
+       a full hero card. */
+    .heroChip[data-ofsted-state="none"] {
+        padding: 0.5rem 0.75rem;
+    }
+    .heroChip[data-ofsted-state="none"] .heroChipSub {
+        display: none;
+    }
+    .heroChip[data-ofsted-state="none"] .heroChipTitle {
+        font-size: 0.85rem;
+        color: var(--text-muted, #6d685f);
+    }
+
     .heroStats {
         gap: 1rem 1.5rem;
     }