Bump @tailwindcss/vite from 4.1.18 to 4.2.1 (#640)

Bumps [@tailwindcss/vite](https://github.com/tailwindlabs/tailwindcss/tree/HEAD/packages/@tailwindcss-vite) 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-vite)

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

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

package.json

@@ -20,7 +20,7 @@
     "@codemirror/view": "^6.39.11",
     "@tailwindcss/forms": "^0.5.11",
     "@tailwindcss/typography": "^0.5.19",
-    "@tailwindcss/vite": "^4.1.18",
+    "@tailwindcss/vite": "^4.2.1",
     "codemirror": "^6.0.2",
     "github-markdown-css": "^5.8.1",
     "highlight.js": "^11.11.1",