fix: update react-dom to 19.2.4 to match react version

Resolves incompatible React versions error between react and react-dom packages.

frontend/package.json

@@ -30,7 +30,7 @@
     "date-fns": "^4.1.0",
     "posthog-js": "^1.356.1",
     "react": "^19.2.0",
-    "react-dom": "^19.2.0",
+    "react-dom": "^19.2.4",
     "react-markdown": "^10.1.0",
     "remark-gfm": "^4.0.1"
   },