feat(RadioGroup): add custom item slots

[EvanSchleret]

❓ 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 support for custom content slots in URadioGroup items.

Developers can now define a slot property on an item to replace its label and description with custom content. A generic content slot is also available for items without a custom slot.

The existing public slot types for legend, label, and description remain unchanged. Documentation, an example, and component tests have been added.

📝 Checklist

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

[EvanSchleret]

Hey @benjamincanac, hope you're doing well!

I didn't add a version badge to the title of the example I added; is that something you handle when preparing your release? Or is it something I could add by myself to make your review easier to validate?

Let me know.

Thanks for your review :)

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 349c0969-7840-4cfe-b03c-faf2d8133b75

📥 Commits

Reviewing files that changed from the base of the PR and between 6352bfd and 12107aa.

📒 Files selected for processing (1)

• docs/content/docs/2.components/radio-group.md

🚧 Files skipped from review as they are similar to previous changes (1)

• docs/content/docs/2.components/radio-group.md

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📝 Walkthrough

Walkthrough

Adds optional per-item and shared content slots to URadioGroup, including dynamic slot typing and fallback label/description rendering. New tests cover custom slots, shared content slots, and missing-slot fallback behavior. Documentation describes the slot property and slot props, and a new example demonstrates a custom slot for a radio item.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly matches the main change: adding custom item slots to RadioGroup.
Description check	✅ Passed	The description is directly related and accurately summarizes the slot support, docs, example, and tests.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[pkg-pr-new]

npm i https://pkg.pr.new/@nuxt/ui@6744

commit: 12107aa

[EvanSchleret]

I added the soon badge you suggested. Let me know if I could do anything else. Thank you :)