chore(deps): bump next from 15.5.3 to 15.5.7 in /ui (#547)

Bumps [next](https://github.com/vercel/next.js) from 15.5.3 to 15.5.7.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.5.3...v15.5.7)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.5.7
  dependency-type: direct:production
...

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

Author: dependabot[bot]

ui/package-lock.json

@@ -24,7 +24,7 @@
     "clsx": "^2.1.1",
     "idb-keyval": "^6.2.1",
     "lucide-react": "^0.454.0",
-    "next": "15.5.3",
+    "next": "15.5.7",
     "next-themes": "^0.4.4",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",