fix: downgrade react and @types/react to version 18.3.1 for compatibility

Author: hotlong

examples/app-react-crud/package.json

@@ -22,13 +22,13 @@
     "@objectstack/plugin-msw": "workspace:*",
     "@objectstack/runtime": "workspace:*",
     "@objectstack/spec": "workspace:*",
-    "react": "^19.2.4",
+    "react": "^18.3.1",
     "react-dom": "^18.3.1"
   },
   "devDependencies": {
     "@objectstack/cli": "workspace:*",
     "@tailwindcss/postcss": "^4.1.18",
-    "@types/react": "^19.2.13",
+    "@types/react": "^18.3.1",
     "@types/react-dom": "^18.3.1",
     "@vitejs/plugin-react": "^5.1.3",
     "autoprefixer": "^10.4.24",