Bump tailwindcss from 3.4.17 to 4.1.6

Bumps [tailwindcss](https://github.com/tailwindlabs/tailwindcss/tree/HEAD/packages/tailwindcss) from 3.4.17 to 4.1.6.
- [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/v4.1.6/packages/tailwindcss)

---
updated-dependencies:
- dependency-name: tailwindcss
  dependency-version: 4.1.6
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package.json

@@ -90,7 +90,7 @@
     "shallowequal": "^1.1.0",
     "showdown": "^2.0.0",
     "sinon": "^20.0.0",
-    "tailwindcss": "^3.0.2",
+    "tailwindcss": "^4.1.6",
     "typescript": "^5.0.2",
     "typescript-eslint": "^8.10.0",
     "vitest": "^3.1.1",