Update react monorepo to v19

package.json

@@ -19,10 +19,10 @@
     "clsx": "1.2.1",
     "concurrently": "8.0.1",
     "next": "13.4.2",
-    "react": "18.2.0",
-    "react-dom": "18.2.0",
-    "react-markdown": "10.1.0",
-    "remark-gfm": "4.0.1",
+    "react": "19.1.0",
+    "react-dom": "19.1.0",
+    "react-markdown": "8.0.7",
+    "remark-gfm": "3.0.1",
     "server-only": "0.0.1",
     "styled-components": "6.0.0-rc.1",
     "styled-jsx": "5.1.2",
@@ -30,8 +30,8 @@
   },
   "devDependencies": {
     "@types/node": "18.16.9",
-    "@types/react": "18.2.6",
-    "@types/react-dom": "18.2.4",
+    "@types/react": "19.1.8",
+    "@types/react-dom": "19.1.6",
     "autoprefixer": "10.4.14",
     "eslint": "9.32.0",
     "eslint-config-next": "latest",