fix: Downgrade Vite to v5 for Node.js 21 compatibility

Downgraded Vite from v8 to v5 and @vitejs/plugin-react from v6 to v4
to resolve compatibility issues with Node.js 21.7.3.
Fixed TypeScript type-only imports to comply with verbatimModuleSyntax.

Fixes #1
Co-Authored-By: Claude <noreply@anthropic.com>

package.json

@@ -22,13 +22,13 @@
     "@types/node": "^24.12.2",
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",
-    "@vitejs/plugin-react": "^6.0.1",
+    "@vitejs/plugin-react": "^4.7.0",
     "eslint": "^9.39.4",
     "eslint-plugin-react-hooks": "^7.0.1",
     "eslint-plugin-react-refresh": "^0.5.2",
     "globals": "^17.4.0",
     "typescript": "~6.0.2",
     "typescript-eslint": "^8.58.0",
-    "vite": "^8.0.4"
+    "vite": "^5.4.21"
   }
 }