fix(deps): update react monorepo to v19

Author: renovate[bot]

package.json

@@ -24,8 +24,8 @@
     "clsx": "^2.0.0",
     "hast-util-is-element": "^3.0.0",
     "prism-react-renderer": "^2.0.0",
-    "react": "^18.2.0",
-    "react-dom": "^18.2.0",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
     "rehype-katex": "7.0.1",
     "remark-math": "6.0.0"
   },