chore(deps): bump next from 15.5.15 to 16.2.9 in /client

Bumps [next](https://github.com/vercel/next.js) from 15.5.15 to 16.2.9.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.5.15...v16.2.9)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 16.2.7
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

client/package-lock.json

@@ -73,7 +73,7 @@
     "embla-carousel-react": "8.6.0",
     "geist": "^1.7.2",
     "input-otp": "1.4.2",
-    "next": "15.5.15",
+    "next": "16.2.9",
     "next-themes": "^0.4.6",
     "react": "^19.2.7",
     "react-day-picker": "9.8.0",