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

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

nextjs-app/components/LeafletMapInner.tsx

@@ -9,7 +9,7 @@ import { useEffect, useRef, useState } from 'react';
 import L from 'leaflet';
 import 'leaflet/dist/leaflet.css';
 import type { School } from '@/lib/types';
-import { schoolUrl, isSpecialSchool, buildOfstedListBadge, listRwmValue } from '@/lib/utils';
+import { schoolUrl, isSpecialSchool, isIndependentSchool, buildOfstedListBadge, listRwmValue } from '@/lib/utils';
 
 interface LeafletMapInnerProps {
   schools: School[];
@@ -70,7 +70,7 @@ function metricHtml(school: School, { nationalAvgRwm, laAverages }: CardContext)
     const score = school.attainment_8_score;
     const laAvg = school.local_authority ? (laAverages?.[school.local_authority] ?? null) : null;
     let delta = '';
-    if (!special && laAvg != null) {
+    if (!special && !isIndependentSchool(school) && laAvg != null) {
       const diff = Math.round((score - laAvg) * 10) / 10;
       // Att8 runs 0–90 in 0.1 steps; ±0.5 is meaningful, where RWM needs ±2.
       const cls = diff >= 0.5 ? 'sc-up' : diff <= -0.5 ? 'sc-down' : '';