Update react monorepo to v19

Author: renovate[bot]

mucgpt-frontend/package.json

@@ -13,8 +13,8 @@
         "markmap-view": "0.18.12",
         "mermaid": "11.11.0",
         "ndjson-readablestream": "1.4.0",
-        "react": "18.3.1",
-        "react-dom": "18.3.1",
+        "react": "19.1.1",
+        "react-dom": "19.1.1",
         "react-i18next": "15.7.3",
         "react-markdown": "10.1.0",
         "react-router-dom": "7.8.2",
@@ -33,9 +33,9 @@
         "esbuild": ">=0.25.0",
         "@types/dompurify": "3.2.0",
         "@types/node": "22.14.0",
-        "@types/react": "18.3.12",
+        "@types/react": "19.1.13",
         "@types/react-syntax-highlighter": "15.5.13",
-        "@types/react-dom": "18.3.7",
+        "@types/react-dom": "19.1.9",
         "@vitejs/plugin-react": "5.0.2",
         "eslint": "9.35.0",
         "eslint-plugin-react": "7.37.5",