fix(detail): align Ofsted Report Card grade chips

The grade boxes rendered inconsistently: Safeguarding "Met" was a small
0.8125rem inline pill while grade values ("Strong") were 1.25rem full-width
chips, and because category labels wrap to one or two lines each value sat at
a different vertical position. Two-line values like "Expected standard" also
produced a taller box.

Add a scoped `.gradeGrid` modifier (Report Card + OEIF grids in both the
primary and secondary detail views) that reserves two label lines so every
chip shares a baseline, and gives all value chips one font size, padding and
min-height — long text wraps inside an equal-height chip via max-width:100%.
Scoped rather than touching the shared `.metricCard`/`.metricValue` used by
the finance, phonics and admissions sections.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0146VHeLAWjDVE2B5uU67jCB

nextjs-app/components/SchoolDetailView.tsx

@@ -555,7 +555,7 @@ export function SchoolDetailView({
               <p className={styles.ofstedDisclaimer}>
                 From November 2025, Ofsted replaced single overall grades with Report Cards rating schools across several areas.
               </p>
-              <div className={styles.metricsGrid}>
+              <div className={`${styles.metricsGrid} ${styles.gradeGrid}`}>
                 {ofsted.rc_safeguarding_met != null && (
                   <div className={styles.metricCard}>
                     <div className={styles.metricLabel}>Safeguarding</div>
@@ -601,7 +601,7 @@ export function SchoolDetailView({
                   Rated <strong>{OFSTED_LABELS[ofsted.overall_effectiveness!]}</strong> across all inspected areas — Quality of Teaching, Behaviour, Pupils&apos; Development and Leadership.
                 </p>
               ) : (
-                <div className={styles.metricsGrid}>
+                <div className={`${styles.metricsGrid} ${styles.gradeGrid}`}>
                   {oeifAreas.map(({ label, value }) => (
                     <div key={label} className={styles.metricCard}>
                       <div className={styles.metricLabel}>{label}</div>