chore(deps): bump next from 15.5.9 to 16.1.5

Bumps [next](https://github.com/vercel/next.js) from 15.5.9 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@v15.5.9...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]

app/package.json

@@ -17,7 +17,7 @@
     "file-saver": "^2.0.5",
     "json-2-csv": "^5.5.10",
     "marked": "^17.0.1",
-    "next": "^15",
+    "next": "^16",
     "next-themes": "^0.4.6",
     "postcss": "^8.4.38",
     "raw-loader": "^4.0.2",