chore(deps-dev): bump vitest from 2.1.9 to 4.0.18 in /frontend

Bumps [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest) from 2.1.9 to 4.0.18.
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v4.0.18/packages/vitest)

---
updated-dependencies:
- dependency-name: vitest
  dependency-version: 4.0.18
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

frontend/package.json

@@ -28,7 +28,7 @@
     "tailwindcss": "^3.4.17",
     "typescript": "^5.7.2",
     "vite": "^5.4.11",
-    "vitest": "^2.1.8",
+    "vitest": "^4.0.18",
     "vue-tsc": "^2.1.10"
   }
 }