chore(deps): bump @fumadocs/ui from 16.4.7 to 16.4.9

Bumps [@fumadocs/ui](https://github.com/fuma-nama/fumadocs) from 16.4.7 to 16.4.9.
- [Release notes](https://github.com/fuma-nama/fumadocs/releases)
- [Commits](https://github.com/fuma-nama/fumadocs/commits/@fumadocs/ui@16.4.9)

---
updated-dependencies:
- dependency-name: "@fumadocs/ui"
  dependency-version: 16.4.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

packages/site/package.json

@@ -18,7 +18,7 @@
     "test": "echo \"No test specified\" && exit 0"
   },
   "dependencies": {
-    "@fumadocs/ui": "^16.4.7",
+    "@fumadocs/ui": "^16.4.9",
     "@tailwindcss/postcss": "^4.1.18",
     "@types/mdx": "^2.0.13",
     "@types/node": "^25.0.8",