chore(deps): bump next from 16.1.7 to 16.2.6 in /frontend (#2899)

Bumps [next](https://github.com/vercel/next.js) from 16.1.7 to 16.2.6.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/compare/v16.1.7...v16.2.6)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 16.2.6
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

frontend/package.json

@@ -68,7 +68,7 @@
     "lucide-react": "^0.562.0",
     "motion": "^12.26.2",
     "nanoid": "^5.1.6",
-    "next": "^16.1.7",
+    "next": "^16.2.6",
     "next-themes": "^0.4.6",
     "nextra": "^4.6.1",
     "nextra-theme-docs": "^4.6.1",