fix(ofsted): badge and compare read the grade still in force

Search badges date a grade by the inspection that awarded or confirmed it (ofsted_grade_date) and say 'Inspected · year' when the latest inspection gave no grade. ofstedDisplay's kinds become graded / confirmed / no_overall_grade, read from current_grade rather than a carried-forward overall_effectiveness. lib/ofstedStatus.ts holds the two sentences the school and compare pages share.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

nextjs-app/__tests__/lib/utils.test.ts

@@ -147,23 +147,37 @@ describe('ofstedLegacyAreas', () => {
 
 describe('buildOfstedListBadge', () => {
   it('returns grade word + year for OEIF Outstanding', () => {
-    const badge = buildOfstedListBadge({ ofsted_grade: 1, ofsted_date: '2023-11-15', ofsted_framework: 'OEIF' });
+    const badge = buildOfstedListBadge({ ofsted_grade: 1, ofsted_grade_date: '2023-11-15', ofsted_date: '2023-11-15', ofsted_framework: 'OEIF' });
     expect(badge.label).toBe('Outstanding · 2023');
     expect(badge.cssClass).toBe('ofsted1');
   });
 
   it('returns grade word for each OEIF grade', () => {
-    expect(buildOfstedListBadge({ ofsted_grade: 2, ofsted_date: '2022-05-01' }).label).toBe('Good · 2022');
-    expect(buildOfstedListBadge({ ofsted_grade: 3, ofsted_date: '2021-01-01' }).label).toBe('Req. Improvement · 2021');
-    expect(buildOfstedListBadge({ ofsted_grade: 4, ofsted_date: '2020-03-01' }).label).toBe('Inadequate · 2020');
+    expect(buildOfstedListBadge({ ofsted_grade: 2, ofsted_grade_date: '2022-05-01' }).label).toBe('Good · 2022');
+    expect(buildOfstedListBadge({ ofsted_grade: 3, ofsted_grade_date: '2021-01-01' }).label).toBe('Req. Improvement · 2021');
+    expect(buildOfstedListBadge({ ofsted_grade: 4, ofsted_grade_date: '2020-03-01' }).label).toBe('Inadequate · 2020');
   });
 
-  it('returns grade word without year when date is missing', () => {
-    const badge = buildOfstedListBadge({ ofsted_grade: 2, ofsted_date: null });
+  it('prints a grade without a year when its date is missing', () => {
+    const badge = buildOfstedListBadge({ ofsted_grade: 2, ofsted_grade_date: null, ofsted_date: '2025-01-01' });
     expect(badge.label).toBe('Good');
     expect(badge.cssClass).toBe('ofsted2');
   });
 
+  it('dates a grade by the inspection that awarded it, not the latest visit', () => {
+    // Washwood Heath: Good from a March 2020 graded inspection; latest visit
+    // an ungraded one in May 2025 (audit M1).
+    const badge = buildOfstedListBadge({ ofsted_grade: 2, ofsted_grade_date: '2020-03-03', ofsted_date: '2025-05-21' });
+    expect(badge.label).toBe('Good · 2020');
+  });
+
+  it('shows Inspected for a latest inspection that gave no grade (Rabbsfarm)', () => {
+    // Audit C1: this used to read "Good · 2025", from a 2020 ungraded visit.
+    const badge = buildOfstedListBadge({ ofsted_grade: null, ofsted_grade_date: null, ofsted_date: '2025-06-17' });
+    expect(badge.label).toBe('Inspected · 2025');
+    expect(badge.cssClass).toBe('ofstedInspected');
+  });
+
   it('returns a Report Card badge when ofsted_rc_date is present', () => {
     const badge = buildOfstedListBadge({ ofsted_grade: null, ofsted_rc_date: '2026-02-03' });
     expect(badge.label).toBe('Report Card · 2026');