chore(deps): bump @nuxt/ui from 2.21.1 to 4.1.0 in /playground

Bumps [@nuxt/ui](https://github.com/nuxt/ui) from 2.21.1 to 4.1.0.
- [Release notes](https://github.com/nuxt/ui/releases)
- [Changelog](https://github.com/nuxt/ui/blob/v4/CHANGELOG.md)
- [Commits](nuxt/ui@v2.21.1...v4.1.0)

---
updated-dependencies:
- dependency-name: "@nuxt/ui"
  dependency-version: 4.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

playground/package.json

@@ -9,7 +9,7 @@
   },
   "dependencies": {
     "@libsql/client": "^0.15.15",
-    "@nuxt/ui": "^2.21.1",
+    "@nuxt/ui": "^4.1.0",
     "@nuxthub/core": "^0.9.0",
     "nuxt": "^3.17.5"
   },