chore(deps-dev): Bump shadcn from 4.0.8 to 4.12.0 in /frontend

Bumps [shadcn](https://github.com/shadcn-ui/ui/tree/HEAD/packages/shadcn) from 4.0.8 to 4.12.0.
- [Release notes](https://github.com/shadcn-ui/ui/releases)
- [Changelog](https://github.com/shadcn-ui/ui/blob/main/packages/shadcn/CHANGELOG.md)
- [Commits](https://github.com/shadcn-ui/ui/commits/shadcn@4.12.0/packages/shadcn)

---
updated-dependencies:
- dependency-name: shadcn
  dependency-version: 4.12.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]