⬆ Bump zod from 4.1.13 to 4.2.1 in /frontend (#2064)

Bumps [zod](https://github.com/colinhacks/zod) from 4.1.13 to 4.2.1.
- [Release notes](https://github.com/colinhacks/zod/releases)
- [Commits](https://github.com/colinhacks/zod/compare/v4.1.13...v4.2.1)

---
updated-dependencies:
- dependency-name: zod
  dependency-version: 4.2.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

frontend/package.json

@@ -44,7 +44,7 @@
     "sonner": "^2.0.7",
     "tailwind-merge": "^3.4.0",
     "tailwindcss": "^4.1.17",
-    "zod": "^4.1.13"
+    "zod": "^4.2.1"
   },
   "devDependencies": {
     "@biomejs/biome": "^2.3.8",