chore(deps): bump fumadocs-ui from 16.5.1 to 16.6.5

Bumps [fumadocs-ui](https://github.com/fuma-nama/fumadocs) from 16.5.1 to 16.6.5.
- [Release notes](https://github.com/fuma-nama/fumadocs/releases)
- [Commits](https://github.com/fuma-nama/fumadocs/commits/fumadocs-ui@16.6.5)

---
updated-dependencies:
- dependency-name: fumadocs-ui
  dependency-version: 16.6.5
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

packages/site/package.json

@@ -24,7 +24,7 @@
     "dotenv": "^16.4.5",
     "fumadocs-core": "16.5.1",
     "fumadocs-mdx": "14.2.6",
-    "fumadocs-ui": "16.5.1",
+    "fumadocs-ui": "16.6.5",
     "lucide-react": "^0.563.0",
     "next": "16.1.6",
     "openai": "^6.18.0",