refactor: rename similar → nearby, so the code says what the section does

The section ranks on distance and is headed "Other schools nearby", but every
identifier still called it "similar" — the exact drift that leaves a later
reader trusting a name over the behaviour.

Mechanical: files, the module, the payload key, the type, the components, the
prop. No behaviour change; the suites are unchanged in count and still green.
Free to do now because #150 has not merged, so the payload key rename needs no
lockstep deploy. Uses of "similar" that are ordinary English — progress
measures compared to similar pupils, and unrelated comments — are untouched.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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

@@ -9,24 +9,24 @@ import { render, screen } from '@testing-library/react';
 
 import {
   nearbyNoun,
-  SimilarSchoolsSection,
-  shouldRenderSimilar,
-} from '@/components/school/SimilarSchoolsSection';
-import type { SimilarSchool } from '@/lib/types';
+  NearbySchoolsSection,
+  shouldRenderNearby,
+} from '@/components/school/NearbySchoolsSection';
+import type { NearbySchool } from '@/lib/types';
 
 jest.mock('@/components/school/AddToCompareButton', () => ({
-  AddToCompareButton: ({ school }: { school: SimilarSchool }) => (
+  AddToCompareButton: ({ school }: { school: NearbySchool }) => (
     <button type="button">Add {school.school_name} to compare</button>
   ),
 }));
 
-jest.mock('@/components/school/SimilarSchoolsCompareBar', () => ({
-  SimilarSchoolsCompareBar: ({ thisUrn }: { thisUrn: number }) => (
+jest.mock('@/components/school/NearbySchoolsCompareBar', () => ({
+  NearbySchoolsCompareBar: ({ thisUrn }: { thisUrn: number }) => (
     <div data-testid="compare-bar">bar for {thisUrn}</div>
   ),
 }));
 
-function school(overrides: Partial<SimilarSchool> = {}): SimilarSchool {
+function school(overrides: Partial<NearbySchool> = {}): NearbySchool {
   return {
     urn: 100002,
     school_name: 'Willow Lane Primary School',
@@ -41,14 +41,14 @@ function school(overrides: Partial<SimilarSchool> = {}): SimilarSchool {
   };
 }
 
-function renderSection(similar: SimilarSchool[]) {
+function renderSection(nearby: NearbySchool[]) {
   return render(
-    <SimilarSchoolsSection
+    <NearbySchoolsSection
       urn={100001}
       schoolName="Meadowbrook Primary School"
       phase="Primary"
       thisMetricValue={72}
-      similar={similar}
+      nearby={nearby}
     />,
   );
 }
@@ -60,11 +60,11 @@ describe('render gates', () => {
     ['empty', []],
     ['a single school', [school()]],
   ])('renders nothing for %s', (_label, value) => {
-    expect(shouldRenderSimilar(value as SimilarSchool[] | null | undefined)).toBe(false);
+    expect(shouldRenderNearby(value as NearbySchool[] | null | undefined)).toBe(false);
   });
 
   it('renders for two or more schools', () => {
-    expect(shouldRenderSimilar([school(), school({ urn: 100003 })])).toBe(true);
+    expect(shouldRenderNearby([school(), school({ urn: 100003 })])).toBe(true);
   });
 
   it('returns null rather than an empty shell below the minimum', () => {
@@ -91,12 +91,12 @@ describe('what the section claims', () => {
 
   it('shows no chips at all when nothing is shared, rather than inventing one', () => {
     const { container } = render(
-      <SimilarSchoolsSection
+      <NearbySchoolsSection
         urn={100001}
         schoolName="Meadowbrook Primary School"
         phase="Primary"
         thisMetricValue={72}
-        similar={[school({ shared: [] }), school({ urn: 100003, shared: [] })]}
+        nearby={[school({ shared: [] }), school({ urn: 100003, shared: [] })]}
       />,
     );
     // The card still carries its distance, name, type and figure — just no
@@ -124,12 +124,12 @@ describe('what the lede calls the set', () => {
 
   it('never calls a sixth form college\'s neighbours primary schools', () => {
     render(
-      <SimilarSchoolsSection
+      <NearbySchoolsSection
         urn={100001}
         schoolName="Barnet Sixth Form College"
         phase="16 plus"
         thisMetricValue={null}
-        similar={[school(), school({ urn: 100003 })]}
+        nearby={[school(), school({ urn: 100003 })]}
       />,
     );
     expect(screen.getByText(/Other schools and colleges near Barnet Sixth Form College/)).toBeInTheDocument();