chore(bot): bump the tailwindcss group in /assets with 2 updates

Bumps the tailwindcss group in /assets with 2 updates: [@tailwindcss/cli](https://github.com/tailwindlabs/tailwindcss/tree/HEAD/packages/@tailwindcss-cli) and [tailwindcss](https://github.com/tailwindlabs/tailwindcss/tree/HEAD/packages/tailwindcss).


Updates `@tailwindcss/cli` from 4.1.18 to 4.2.1
- [Release notes](https://github.com/tailwindlabs/tailwindcss/releases)
- [Changelog](https://github.com/tailwindlabs/tailwindcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/tailwindlabs/tailwindcss/commits/v4.2.1/packages/@tailwindcss-cli)

Updates `tailwindcss` from 4.1.18 to 4.2.1
- [Release notes](https://github.com/tailwindlabs/tailwindcss/releases)
- [Changelog](https://github.com/tailwindlabs/tailwindcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/tailwindlabs/tailwindcss/commits/v4.2.1/packages/tailwindcss)

---
updated-dependencies:
- dependency-name: "@tailwindcss/cli"
  dependency-version: 4.2.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: tailwindcss
- dependency-name: tailwindcss
  dependency-version: 4.2.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: tailwindcss
...

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Author: dependabot[bot]