chore: standardize ESM-first architecture and resolve all type/test/lint errors

package.json

@@ -1,10 +1,13 @@
 {
+  "name": "klz-cables-nextjs",
+  "type": "module",
+  "private": true,
   "dependencies": {
     "@directus/sdk": "^21.0.0",
     "@mintel/mail": "^1.6.0",
     "@mintel/next-config": "^1.6.0",
     "@mintel/next-feedback": "^1.6.0",
-    "@mintel/next-utils": "^1.7.12",
+    "@mintel/next-utils": "^1.7.15",
     "@react-email/components": "^1.0.7",
     "@react-pdf/renderer": "^4.3.2",
     "@sentry/nextjs": "^10.38.0",
@@ -53,9 +56,11 @@
     "@types/react": "^19.2.7",
     "@types/react-dom": "^19.2.3",
     "@types/sharp": "^0.31.1",
+    "@vitejs/plugin-react": "^5.1.4",
     "@vitest/ui": "^4.0.16",
     "autoprefixer": "^10.4.23",
     "eslint": "^9.18.0",
+    "happy-dom": "^20.6.1",
     "husky": "^9.1.7",
     "lint-staged": "^16.2.7",
     "postcss": "^8.5.6",
@@ -66,8 +71,6 @@
     "typescript": "^5.7.2",
     "vitest": "^4.0.16"
   },
-  "name": "klz-cables-nextjs",
-  "private": true,
   "scripts": {
     "dev": "docker network create infra 2>/dev/null || true && echo '\\n🚀 Development Environment Starting...\\n\\n📱 App:      http://klz.localhost\\n🗄️  CMS:      http://cms.klz.localhost/admin\\n🚦 Traefik:  http://localhost:8080\\n\\n(Press Ctrl+C to stop)\\n' && docker-compose down --remove-orphans && docker-compose up klz-app directus directus-db gatekeeper",
     "dev:local": "next dev",