Add interactive school map to homepage

Replace the text list of schools with a Leaflet map showing anonymous
orange pins for 110 customer schools across Australia. Includes build-time
Airtable fetch script with Nominatim geocoding and gradient glow effect
on clustered pins.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -6,18 +6,22 @@
     "dev": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "eslint"
+    "lint": "eslint",
+    "fetch-schools": "npx tsx scripts/fetch-schools.ts"
   },
   "dependencies": {
     "gray-matter": "^4.0.3",
+    "leaflet": "^1.9.4",
     "next": "16.1.6",
     "next-mdx-remote": "^6.0.0",
     "react": "19.2.3",
     "react-dom": "19.2.3",
+    "react-leaflet": "^5.0.0",
     "stripe": "^20.4.0"
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4",
+    "@types/leaflet": "^1.9.21",
     "@types/node": "^20",
     "@types/react": "^19",
     "@types/react-dom": "^19",