chore(deps): bump fumadocs-ui from 16.4.11 to 16.6.5

Bumps [fumadocs-ui](https://github.com/fuma-nama/fumadocs) from 16.4.11 to 16.6.5.
- [Release notes](https://github.com/fuma-nama/fumadocs/releases)
- [Commits](https://github.com/fuma-nama/fumadocs/compare/fumadocs-ui@16.4.11...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]

apps/site/package.json

@@ -14,7 +14,7 @@
     "fumadocs-docgen": "^3.0.7",
     "fumadocs-mdx": "^14.2.8",
     "fumadocs-twoslash": "^3.1.13",
-    "fumadocs-ui": "^16.4.11",
+    "fumadocs-ui": "^16.6.5",
     "lucide-react": "^0.563.0",
     "next": "^16.1.4",
     "react": "^19.0.0",