feat: tailwind-merge 모바일 커스텀 클래스 등록 (#173)

[haruyam15]

Summary

• typo classGroup에 모바일 타이포그래피 클래스 12종 추가 (typo-m-heading1~3, typo-m-subtitle1~3, typo-m-body1~4, typo-m-caption1~2)
• spacing 테마에 xlarge_m 토큰 추가
• radius 테마에 xtiny 토큰 추가

배경

cn() 내부의 tailwind-merge는 등록되지 않은 클래스를 동일 그룹으로 인식하지 못합니다.
모바일 반응형 작업(#162)에서 max-lg:typo-m-subtitle2 같이 반응형 prefix + 커스텀 typo 클래스를 조합할 때,
extendTailwindMerge에 모바일 클래스가 없으면 충돌 해결이 되지 않아 스타일이 의도대로 적용되지 않습니다.

Test plan

• cn('typo-body3 max-lg:typo-m-subtitle2') 반환값에서 두 클래스가 모두 유지되는지 확인
• cn('typo-body3', 'typo-m-body1') 처럼 같은 그룹 내 충돌 시 뒤쪽 클래스로 올바르게 병합되는지 확인
• Calendar, DatePicker 컴포넌트에서 모바일 타이포 스타일이 정상 적용되는지 확인

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Reviewing files that changed from the base of the PR and between dc177df and 9db52c4.

📒 Files selected for processing (1)

• src/shared/lib/utils.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/tw-merge-mobile-173

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