build(deps): bump next from 15.2.4 to 15.4.7 in /chat

Bumps [next](https://github.com/vercel/next.js) from 15.2.4 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@v15.2.4...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]

chat/package.json

@@ -6,7 +6,7 @@
  "class-variance-authority": "^0.7.1",
  "clsx": "^2.1.1",
  "lucide-react": "^0.511.0",
- "next": "15.2.4",
+ "next": "15.4.7",
  "next-themes": "^0.4.6",
  "react": "^19.0.0",
  "react-dom": "^19.0.0",