build(deps): bump zod from 3.25.76 to 4.3.6 in /frontend (#185)

Bumps [zod](https://github.com/colinhacks/zod) from 3.25.76 to 4.3.6.
- [Release notes](https://github.com/colinhacks/zod/releases)
- [Commits](https://github.com/colinhacks/zod/compare/v3.25.76...v4.3.6)

---
updated-dependencies:
- dependency-name: zod
  dependency-version: 4.3.6
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

frontend/package.json

@@ -27,7 +27,7 @@
     "react-dom": "^18.3.1",
     "react-i18next": "^15.4.1",
     "react-router-dom": "^7.13.0",
-    "zod": "^3.23.8"
+    "zod": "^4.3.6"
   },
   "devDependencies": {
     "@biomejs/biome": "^2.3.15",