Bump tailwindcss from 3.4.17 to 4.1.5

Bumps [tailwindcss](https://github.com/tailwindlabs/tailwindcss/tree/HEAD/packages/tailwindcss) from 3.4.17 to 4.1.5.
- [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/v4.1.5/packages/tailwindcss)

---
updated-dependencies:
- dependency-name: tailwindcss
  dependency-version: 4.1.5
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

apps/demo/package.json

@@ -21,7 +21,7 @@
     "@vitejs/plugin-react": "^4.3.4",
     "autoprefixer": "^10.4.21",
     "postcss": "^8.5.3",
-    "tailwindcss": "^3.4.17",
+    "tailwindcss": "^4.1.5",
     "typescript": "^5.8.2",
     "vite": "^6.2.4"
   }