docs(www): document Radio & fix unwired legend style

[Yeom-JinHo]

Changes

Radio를 문서로 추가하면서, 문서를 쓰다 드러난 컴포넌트 버그 1개를 같은 PR에서 고칩니다.

packages/radio 버그 수정 (@sipe-team/radio: patch)

• 미적용 legend 스타일: Radio.css.ts에 radioGroupLegend 스타일(굵기 600·16px·marginBottom 8px·토큰 색)이 정의돼 있었지만 RadioGroup.tsx의 <legend>{labelText}</legend>에 className이 붙지 않아, 그룹 라벨이 브라우저 기본 스타일로 렌더됐습니다. <legend className={radioGroupLegend}>로 연결해 의도한 스타일이 실제로 적용되게 했습니다. (죽어 있던 export를 살리는 변경이라 부작용 없음)

radio.mdx

• Installation / Usage / Examples / Anatomy / API Reference. API 표는 소스를 직접 읽고 수동 작성.
• RadioGroup + Radio 플랫 export 구조(네임스페이스 아님)를 문서화. Uncontrolled / Controlled(value + onChangeValue) / Sizes(small·medium·large) / Disabled(그룹·개별) 예제.
• 각 <Preview code={...}> 예제 코드는 실제 렌더 결과와 일치.

Visuals

Checklist

• Have you written the functional specifications? — 문서 자체가 명세
• Have you written the test code? — 패키지 테스트 15개 통과. 문서는 프로덕션 빌드로 검증

Additional Discussion Points

• 브랜치 카테고리는 docs지만 컴포넌트 fix를 포함합니다. changeset 포함(patch).

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[changeset-bot]

🦋 Changeset detected

Latest commit: f1c0fe4

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@sipe-team/radio	Patch
@sipe-team/side	Patch
docs	Patch

Not sure what this means? Click here to learn what changesets are.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
packages/radio/src/RadioGroup.tsx	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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