chore(deps): bump next from 15.5.14 to 16.2.1

Bumps [next](https://github.com/vercel/next.js) from 15.5.14 to 16.2.1.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.5.14...v16.2.1)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 16.2.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package-lock.json

@@ -47,7 +47,7 @@
         "clsx": "^2.1.1",
         "github-markdown-css": "^5.8.1",
         "lucide-react": "^0.474.0",
-        "next": "^15.3.4",
+        "next": "^16.2.1",
         "react": "^19.0.0",
         "react-confetti": "6.4.0",
         "react-dom": "^19.0.0",