build(deps): bump next from 15.3.6 to 16.1.5

Bumps [next](https://github.com/vercel/next.js) from 15.3.6 to 16.1.5.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.3.6...v16.1.5)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 16.1.5
  dependency-type: direct:production
...

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

Author: dependabot[bot]

package.json

@@ -73,7 +73,7 @@
     "lottie-react": "^2.4.1",
     "lucide-react": "^0.507.0",
     "mapbox-gl": "^3.11.0",
-    "next": "15.3.6",
+    "next": "16.1.5",
     "next-themes": "^0.3.0",
     "open-codex": "^0.1.30",
     "pg": "^8.16.2",