feat: upgrade react from 18.3.1 to 19.0.0

Snyk has created this PR to upgrade react from 18.3.1 to 19.0.0.

See this package in npm:
react

See this project in Snyk:
https://app.snyk.io/org/chaoyang.lu/project/49c4a7d3-5728-46e8-bac3-e357a295abb1?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

Diff for: packages/playground/package.json

@@ -36,7 +36,7 @@
     "class-variance-authority": "^0.7.0",
     "clsx": "^2.1.1",
     "dayjs": "^1.11.11",
-    "react": "^18.2.0",
+    "react": "^19.0.0",
     "react-dom": "^18.2.0",
     "react-resizable-panels": "^2.0.19",
     "tailwind-merge": "^2.3.0",