fix(compare): remove the year-by-year data table from Explore trends

The mockup's Explore trends section is the measure picker + chart only —
no data table. Removes the table (and the now-unused progressBand / band
chip / formatMetricValue plumbing that only fed it).

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

nextjs-app/components/compare/TrendsExplorer.module.css

@@ -75,34 +75,3 @@
     height: 360px;
   }
 }
-
-.tableWrapper {
-  overflow-x: auto;
-  margin-top: 1.5rem;
-}
-
-.table {
-  width: 100%;
-  border-collapse: collapse;
-  font-size: 0.9rem;
-}
-
-.table th,
-.table td {
-  text-align: left;
-  padding: 0.6rem 0.75rem;
-  border-bottom: 1px solid var(--border-light);
-}
-
-.table th {
-  background: var(--bg-secondary);
-  font-size: 0.8rem;
-  text-transform: uppercase;
-  letter-spacing: 0.03em;
-  color: var(--text-secondary);
-}
-
-.yearCell {
-  font-weight: 600;
-  white-space: nowrap;
-}

nextjs-app/components/compare/TrendsExplorer.tsx

@@ -1,19 +1,17 @@
 /**
  * Explore trends — the full grouped metric catalogue (nothing from the old
- * compare page is lost; spec §4's tier 3) driving the year-by-year chart
- * with its England reference line, plus the year-by-year table. Progress
- * metrics carry CI-based bands for the years DfE published them.
+ * compare page is lost; spec §4's tier 3) driving the year-by-year chart with
+ * its England reference line. Matches the mockup: a measure picker and the
+ * chart only (no data table).
  */
 
 'use client';
 
 import dynamic from 'next/dynamic';
 
-import { progressBand } from '@/lib/compareLogic';
 import type { ComparisonData, MetricDefinition, NationalAverages, School } from '@/lib/types';
-import { formatAcademicYear, formatMetricValue, metricKind } from '@/lib/utils';
 import { track } from '@/lib/analytics';
-import { Chip, Section, sectionStyles as s } from './sectionShared';
+import { Section } from './sectionShared';
 import styles from './TrendsExplorer.module.css';
 
 const ComparisonChart = dynamic(
@@ -40,14 +38,6 @@ const SECONDARY_OPTGROUPS: { label: string; category: string }[] = [
 export const PRIMARY_CATEGORIES = PRIMARY_OPTGROUPS.map((g) => g.category);
 export const SECONDARY_CATEGORIES = SECONDARY_OPTGROUPS.map((g) => g.category);
 
-const PROGRESS_CI: Record<string, [string, string]> = {
-  reading_progress: ['reading_progress_lower_ci', 'reading_progress_upper_ci'],
-  writing_progress: ['writing_progress_lower_ci', 'writing_progress_upper_ci'],
-  maths_progress: ['maths_progress_lower_ci', 'maths_progress_upper_ci'],
-};
-
-const BAND_LABEL = { above: 'Above average', average: 'Average', below: 'Below average' } as const;
-
 export function TrendsExplorer({
   schools,
   data,
@@ -78,21 +68,11 @@ export function TrendsExplorer({
     nationalByYear[entry.year] = block?.[metric] ?? null;
   }
 
-  const years = [
-    ...new Set(
-      schools.flatMap(
-        (school) => data[String(school.urn)]?.yearly_data.map((d) => Math.trunc(d.year)) ?? [],
-      ),
-    ),
-  ].sort((a, b) => a - b);
-
   const handleMetricChange = (next: string) => {
     track('compare_metric_changed', { metric: next, phase: isPrimaryPhase ? 'primary' : 'secondary' });
     onMetricChange(next);
   };
 
-  const ciKeys = PROGRESS_CI[metric];
-
   return (
     <Section
       title="Explore trends"
@@ -128,8 +108,7 @@ export function TrendsExplorer({
           {metric.includes('progress') && (
             <p className={styles.progressNote}>
               Progress scores measure pupils&apos; progress from KS1 to KS2. A score of 0 equals the
-              national average. DfE stopped publishing KS2 progress after 2022/23 (no KS1 baseline);
-              bands use DfE&apos;s confidence intervals, not the raw score alone.
+              national average. DfE stopped publishing KS2 progress after 2022/23 (no KS1 baseline).
             </p>
           )}
 
@@ -142,52 +121,6 @@ export function TrendsExplorer({
               nationalByYear={nationalByYear}
             />
           </div>
-
-          {years.length > 0 && (
-            <div className={styles.tableWrapper}>
-              <table className={styles.table}>
-                <thead>
-                  <tr>
-                    <th>Year</th>
-                    {schools.map((school) => (
-                      <th key={school.urn}>{school.school_name}</th>
-                    ))}
-                  </tr>
-                </thead>
-                <tbody>
-                  {years.map((year) => (
-                    <tr key={year}>
-                      <td className={styles.yearCell}>{formatAcademicYear(year)}</td>
-                      {schools.map((school) => {
-                        const row = data[String(school.urn)]?.yearly_data.find(
-                          (d) => Math.trunc(d.year) === year,
-                        ) as (Record<string, unknown> & { year: number }) | undefined;
-                        const value = row?.[metric];
-                        if (typeof value !== 'number') return <td key={school.urn}>–</td>;
-                        const band = ciKeys
-                          ? progressBand(
-                              value,
-                              (row?.[ciKeys[0]] as number | null) ?? null,
-                              (row?.[ciKeys[1]] as number | null) ?? null,
-                            )
-                          : null;
-                        return (
-                          <td key={school.urn}>
-                            {formatMetricValue(value, metricKind(metric))}{' '}
-                            {band && (
-                              <Chip tone={band === 'above' ? 'good' : band === 'below' ? 'warn' : 'neutral'}>
-                                {BAND_LABEL[band]}
-                              </Chip>
-                            )}
-                          </td>
-                        );
-                      })}
-                    </tr>
-                  ))}
-                </tbody>
-              </table>
-            </div>
-          )}
         </div>
       </details>
     </Section>