Bump next from 15.2.4 to 15.5.2 in /frontend (#7309)

Bumps [next](https://github.com/vercel/next.js) from 15.2.4 to 15.5.2.
- [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/v15.2.4...v15.5.2)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.5.2
  dependency-type: direct:production
...

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

frontend/package.json

@@ -40,7 +40,7 @@
     "fuse.js": "^7.1.0",
     "lucide-react": "^0.453.0",
     "mini-svg-data-uri": "^1.4.4",
-    "next": "15.2.4",
+    "next": "15.5.2",
     "next-themes": "^0.4.4",
     "nuqs": "^2.4.1",
     "pocketbase": "^0.21.5",