feat(ui): replace card grid with row-based results and plain-language metric labels

Replace the school card grid with a scannable row list that shows 3x more
results per screen. Each row shows: school name + R,W&M % with trend,
area/type meta, and reading/writing/maths progress scores with plain-English
band labels (e.g. "above average") instead of raw numbers.

Add lib/metrics.ts as a single source of truth for plain-language metric
explanations and the progressBand() helper. Map view toggle is unchanged.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

nextjs-app/components/SchoolRow.tsx

@@ -0,0 +1,157 @@
+/**
+ * SchoolRow Component
+ * Compact row-based school display for search results list view
+ */
+
+import type { School } from '@/lib/types';
+import { formatPercentage, formatProgress, calculateTrend } from '@/lib/utils';
+import { progressBand } from '@/lib/metrics';
+import styles from './SchoolRow.module.css';
+
+interface SchoolRowProps {
+  school: School;
+  isLocationSearch?: boolean;
+  isInCompare?: boolean;
+  onAddToCompare?: (school: School) => void;
+  onRemoveFromCompare?: (urn: number) => void;
+}
+
+export function SchoolRow({
+  school,
+  isLocationSearch,
+  isInCompare = false,
+  onAddToCompare,
+  onRemoveFromCompare,
+}: SchoolRowProps) {
+  const trend = calculateTrend(school.rwm_expected_pct, school.prev_rwm_expected_pct);
+
+  const hasProgress =
+    school.reading_progress != null ||
+    school.writing_progress != null ||
+    school.maths_progress != null;
+
+  const handleCompareClick = () => {
+    if (isInCompare) {
+      onRemoveFromCompare?.(school.urn);
+    } else {
+      onAddToCompare?.(school);
+    }
+  };
+
+  return (
+    <div className={`${styles.row} ${isInCompare ? styles.rowInCompare : ''}`}>
+      <div className={styles.rowMain}>
+        {/* Line 1: Name + score + actions */}
+        <div className={styles.rowTop}>
+          <a href={`/school/${school.urn}`} className={styles.schoolName}>
+            {school.school_name}
+          </a>
+
+          <div className={styles.scoreBlock}>
+            {school.rwm_expected_pct != null ? (
+              <>
+                <strong className={styles.scoreValue}>
+                  {formatPercentage(school.rwm_expected_pct, 0)}
+                </strong>
+                {school.prev_rwm_expected_pct != null && (
+                  <span
+                    className={`${styles.trend} ${styles[`trend${trend.charAt(0).toUpperCase() + trend.slice(1)}`]}`}
+                    title={`Previous year: ${formatPercentage(school.prev_rwm_expected_pct)}`}
+                  >
+                    {trend === 'up' && (
+                      <svg viewBox="0 0 16 16" fill="none" width="10" height="10">
+                        <path d="M8 3L14 10H2L8 3Z" fill="currentColor" />
+                      </svg>
+                    )}
+                    {trend === 'down' && (
+                      <svg viewBox="0 0 16 16" fill="none" width="10" height="10">
+                        <path d="M8 13L2 6H14L8 13Z" fill="currentColor" />
+                      </svg>
+                    )}
+                    {trend === 'stable' && (
+                      <svg viewBox="0 0 16 16" fill="none" width="10" height="10">
+                        <rect x="2" y="7" width="12" height="2" rx="1" fill="currentColor" />
+                      </svg>
+                    )}
+                  </span>
+                )}
+              </>
+            ) : (
+              <span className={styles.scoreNA}>—</span>
+            )}
+            <span className={styles.scoreLabel}>R, W &amp; M</span>
+          </div>
+
+          <div className={styles.rowActions}>
+            <a href={`/school/${school.urn}`} className={styles.btnView}>
+              View
+            </a>
+            {(onAddToCompare || onRemoveFromCompare) && (
+              <button
+                onClick={handleCompareClick}
+                className={isInCompare ? styles.btnRemove : styles.btnCompare}
+              >
+                {isInCompare ? '✓ Remove' : '+ Add'}
+              </button>
+            )}
+          </div>
+        </div>
+
+        {/* Line 2: Meta tags */}
+        <div className={styles.rowMeta}>
+          {school.local_authority && <span>{school.local_authority}</span>}
+          {school.school_type && <span>{school.school_type}</span>}
+          {!isLocationSearch &&
+            school.religious_denomination &&
+            school.religious_denomination !== 'Does not apply' && (
+              <span>{school.religious_denomination}</span>
+            )}
+          {isLocationSearch && school.distance != null && (
+            <span className={styles.distanceBadge}>
+              {(school.distance / 1609.34).toFixed(1)} mi
+            </span>
+          )}
+        </div>
+
+        {/* Line 3: Progress scores with plain-language bands */}
+        {hasProgress && (
+          <div className={styles.rowProgress}>
+            {school.reading_progress != null && (
+              <span className={styles.progressItem}>
+                Reading{' '}
+                <strong className={styles.progressValue}>
+                  {formatProgress(school.reading_progress)}
+                </strong>
+                <em className={styles.progressBand}>
+                  {progressBand(school.reading_progress)}
+                </em>
+              </span>
+            )}
+            {school.writing_progress != null && (
+              <span className={styles.progressItem}>
+                Writing{' '}
+                <strong className={styles.progressValue}>
+                  {formatProgress(school.writing_progress)}
+                </strong>
+                <em className={styles.progressBand}>
+                  {progressBand(school.writing_progress)}
+                </em>
+              </span>
+            )}
+            {school.maths_progress != null && (
+              <span className={styles.progressItem}>
+                Maths{' '}
+                <strong className={styles.progressValue}>
+                  {formatProgress(school.maths_progress)}
+                </strong>
+                <em className={styles.progressBand}>
+                  {progressBand(school.maths_progress)}
+                </em>
+              </span>
+            )}
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}