Fix: Add radio field support

[bobbwal]

Description

Add full support for radio fields in both code-based and UI-built collections, and add E2E coverage.

Fixes #636

Changes

• Add radio to the collection builder field type dropdown and options panel.
• Map radio field types into collection schemas and render/save radio values.
• Support the inline option property for horizontal radio layouts.
• Add E2E test for creating content with a radio selection.

Testing

• npx playwright test tests/e2e/52-radio-field.spec.ts --config tests/playwright.config.ts

Unit Tests

• Added/updated unit tests
• All unit tests passing

E2E Tests

• Added/updated E2E tests
• All E2E tests passing

Checklist

• Code follows project conventions
• Tests added/updated and passing
• Type checking passes
• No console errors or warnings
• Documentation updated (if needed)

---

Generated with Claude Code in Conductor

[tomByrer]

I wonder if this could be more generic, to allow both multiple (AKA checkboxes) & single (AKA radio) choices?

[bobbwal]

I wonder if this could be more generic, to allow both multiple (AKA checkboxes) & single (AKA radio) choices?

Only single boolean checkboxes are supported I think? I only discovered this when looking at the radios. This should probably be looked at in a separate issue.