feat(module): add theme.prefix option

[benjamincanac]

🔗 Linked issue

Resolves #3596, resolves #3841

❓ 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

This PR adds a new theme.prefix option in your nuxt.config.ts to support Tailwind CSS prefix:

@import "tailwindcss" prefix(tw);
@import "@nuxt/ui";

export default defineNuxtConfig({
  modules: ['@nuxt/ui'],
  css: ['~/assets/css/main.css'],
  ui: {
    theme: {
      prefix: 'tw'
    }
  }
})

📝 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@5341

commit: 2fe5e70

[benjamincanac]

@byronogis I remember you implemented Tailwind CSS prefix a while ago, I took a shot at this if you want to take a look 😊