chore(deps): bump next from 15.4.1 to 15.4.7 in /src-frontend

Bumps [next](https://github.com/vercel/next.js) from 15.4.1 to 15.4.7.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.4.1...v15.4.7)

---
updated-dependencies:
- dependency-name: next
  dependency-version: 15.4.7
  dependency-type: direct:production
...

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

Author: dependabot[bot]

src-frontend/package.json

@@ -49,7 +49,7 @@
     "framer-motion": "12.23.6",
     "input-otp": "1.4.2",
     "lucide-react": "0.525.0",
-    "next": "15.4.1",
+    "next": "15.4.7",
     "next-themes": "0.4.6",
     "nuqs": "2.4.3",
     "prettier": "3.6.2",