fix(search): no LA comparison for independent schools (H2)

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

nextjs-app/__tests__/components/SecondarySchoolRow.test.tsx

@@ -116,3 +116,38 @@ describe('SecondarySchoolRow shares the school page flags', () => {
     expect(screen.getByText('Fee-paying')).toBeInTheDocument();
   });
 });
+
+describe('SecondarySchoolRow LA comparison', () => {
+  it('compares a state school with its LA average', () => {
+    render(
+      <SecondarySchoolRow
+        school={{ ...base, school_type: 'Academy converter', attainment_8_score: 60 }}
+        laAvgAttainment8={54.5}
+      />,
+    );
+    expect(screen.getByText(/\+5\.5 vs LA avg/)).toBeInTheDocument();
+  });
+
+  it('keeps the comparison for a school whose type is unknown', () => {
+    render(
+      <SecondarySchoolRow
+        school={{ ...base, school_type: null, attainment_8_score: 60 } as unknown as School}
+        laAvgAttainment8={54.5}
+      />,
+    );
+    expect(screen.getByText(/\+5\.5 vs LA avg/)).toBeInTheDocument();
+  });
+
+  it("shows an independent school's Attainment 8 without an LA comparison", () => {
+    // DfE's LA average covers state-funded schools; an independent's
+    // Attainment 8 leaves out IGCSEs (audit H2).
+    render(
+      <SecondarySchoolRow
+        school={{ ...base, school_type: 'Other independent school', attainment_8_score: 20.4 }}
+        laAvgAttainment8={54.5}
+      />,
+    );
+    expect(screen.getByText('20.4')).toBeInTheDocument();
+    expect(screen.queryByText(/vs LA avg/)).not.toBeInTheDocument();
+  });
+});