fix(vite): write theme templates

[antfu]

🔗 Linked issue

Resolves #4951

Peered with @benjamincanac

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Fixes the Vite plugin where theme files were incorrectly shipped inside .nuxt/ on NPM (#build/ui.css import was not working). They are now properly generated as real files that Tailwind CSS can read, ensuring custom theme colors and user configuration work correctly.

Since theme template files are written on disk, you have to update your tsconfig.node.json alias:

{
  "compilerOptions": {
    "paths": {
      "#build/ui": [
-       "./node_modules/@nuxt/ui/.nuxt/ui"
+       "./node_modules/.nuxt-ui/ui"
      ]
    }
  }
}

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[pkg-pr-new]

npm i https://pkg.pr.new/@nuxt/ui@5355

commit: 29b27be

[benjamincanac]

Thanks a lot @antfu! 😊