refactor: enhance regression test

[noahchoii]

Description of Changes

@coderabbitai summary

• composites 패키지의 Dialog 회귀 테스트를 추가했습니다.
• Playwright 회귀 테스트가 core, composites 패키지에 중복으로 존재하기 때문에 파이프라인 관리 및 유지보수가 어려워 질 수 있습니다. 따라서 Playwright 코드를 Storybook 패키지로 이관했습니다. 기존에도 VRT는 스토리북 빌드 파일을 사용하고 있기 때문에, 응집성 측면에서 오히려 더 개선되었다고 볼 수도 있을 거 같아요.
• 회귀 테스트의 스토리베드를 추가할 때 사용할 AI Skills를 추가해두었습니다. /add-composites-test-bed 커맨드로 사용할 수 있습니다. 사용하면 시각적 회귀 테스트에 포함되어야 할 축을 직접 결정하고, Light, Dark 모드에 대한 테스트베드를 각각 추가합니다. 그리고 마지막으로 축 결정 기준을 알려줍니다. UI는 매번 새로 생성하지 않도록 유틸리티 컴포넌트를 만들어두었어요. dialog와 alert-dialog를 대상으로 테스트 해봤는데, 아직까지는 크게 예외적인 케이스가 없어서 무난하게 만들어주지만 점검을 꾸준히 해봐야 할 것 같구요, 다른 컴포넌트에도 계속해서 테스트해보면서 다듬어보면 좋을 것 같아요.

Checklist

Before submitting the PR, please make sure you have checked all of the following items.

• The PR title follows the Conventional Commits convention. (e.g., feat, fix, docs, style, refactor, test, chore)
• I have added tests for my changes.
• I have updated the Storybook or relevant documentation.
• I have added a changeset for this change. (e.g., for any changes that affect users, such as component prop changes or new features).
• I have performed a self-code review.
• I have followed the project's coding conventions and component patterns.

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Project	Deployment	Actions	Updated (UTC)
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