Fix admin reference mode regressions

frontend/package.json

@@ -8,7 +8,8 @@
     "build": "vite build",
     "build:check": "tsc -b && vite build",
     "lint": "eslint .",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "test": "vitest run src/components/admin/__tests__/ThemeCustomizerEnhanced.test.tsx"
   },
   "dependencies": {
     "@tanstack/react-query": "^5.0.0",
@@ -47,6 +48,9 @@
   },
   "devDependencies": {
     "@eslint/js": "^9.29.0",
+    "@testing-library/jest-dom": "^6.6.3",
+    "@testing-library/react": "^16.1.0",
+    "@testing-library/user-event": "^14.6.1",
     "@types/react": "^18.3.12",
     "@types/react-dom": "^18.3.1",
     "@vitejs/plugin-react": "^4.5.2",
@@ -55,10 +59,12 @@
     "eslint-plugin-react-hooks": "^5.2.0",
     "eslint-plugin-react-refresh": "^0.4.20",
     "globals": "^16.2.0",
+    "jsdom": "^25.0.1",
     "postcss": "^8.4.21",
     "tailwindcss": "^3.3.0",
     "typescript": "~5.8.3",
     "typescript-eslint": "^8.34.1",
-    "vite": "^7.1.6"
+    "vite": "^7.1.6",
+    "vitest": "^2.1.5"
   }
 }