fix(deps): update react monorepo to v19

Author: renovate[bot]

package-lock.json

@@ -30,8 +30,8 @@
     "@mdx-js/react": "3.1.1",
     "clsx": "2.1.1",
     "prism-react-renderer": "2.4.1",
-    "react": "18.3.1",
-    "react-dom": "18.3.1",
+    "react": "19.2.1",
+    "react-dom": "19.2.1",
     "rehype-katex": "7.0.1",
     "remark-math": "6.0.0"
   },