fix(deps): update react monorepo to v19

Author: renovate[bot]

core/package.json

@@ -51,8 +51,8 @@
   "devDependencies": {
     "@testing-library/react": "^14.0.0",
     "@types/react-test-renderer": "^18.0.0",
-    "react": "^18.2.0",
-    "react-dom": "^18.2.0",
-    "react-test-renderer": "^18.2.0"
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
+    "react-test-renderer": "^19.0.0"
   }
 }

www/package.json

@@ -10,8 +10,8 @@
   "dependencies": {
     "@uiw/react-markdown-preview-example": "^2.1.4",
     "@uiw/react-only-when": "3.0.1",
-    "react": "^18.2.0",
-    "react-dom": "^18.2.0"
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0"
   },
   "devDependencies": {
     "@babel/plugin-proposal-private-property-in-object": "^7.21.11",