🎨 Palette: ScoreViewer 아이콘 버튼 툴팁 및 접근성 강화

[seonghobae]

💡 무엇을: ScoreViewer의 줌, 페이지 이동 아이콘 버튼들에 title 속성을 추가하고, 비활성화된 페이지 이동 버튼들의 disabled 속성을 aria-disabled="true" 및 이벤트 차단 로직으로 변경했습니다.
🎯 왜: 아이콘만 있는 버튼에 마우스 오버 시 툴팁(title)을 제공하여 사용성을 개선하고, 비활성화된 버튼에도 스크린 리더와 마우스 이벤트(툴팁 표시)가 접근 가능하도록 하여 장애인 및 비장애인 사용자 모두의 편의를 증진하기 위함입니다.
📸 전/후: (아이콘 마우스 오버 시 네이티브 툴팁 노출 및 포커스 가능 상태 변경 적용)
♿ 접근성: 스크린 리더 포커스가 가능한 상태로 비활성화 툴팁 및 피드백을 전달할 수 있도록 접근성을 한층 끌어올렸습니다.

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PR created automatically by Jules for task 9882869868104005667 started by @seonghobae

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• .jules/palette.md
• apps/desktop/src/features/score/ScoreViewer.test.tsx
• apps/desktop/src/features/score/ScoreViewer.tsx

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[seonghobae]

Closing as superseded by canonical score-button accessibility owner #731 after exact-diff review. #954 duplicates the zoom/page title and focusable aria-disabled behavior, while #731 preserves those behaviors and adds the stronger disabled-state contract: renderer-owned aria-describedby targets with localized recovery text, stale-description removal when the action becomes available, explicit guarded clicks, disabled-state styling, focused regressions, locale updates, doctoring, and ScoreView-level accessibility coverage. #954 has no unique safe buyer-visible behavior that is absent from #731, so keeping both would create competing writers on ScoreViewer.tsx.

[google-labs-jules]

Closing as superseded by canonical score-button accessibility owner #731 after exact-diff review. #954 duplicates the zoom/page title and focusable aria-disabled behavior, while #731 preserves those behaviors and adds the stronger disabled-state contract: renderer-owned aria-describedby targets with localized recovery text, stale-description removal when the action becomes available, explicit guarded clicks, disabled-state styling, focused regressions, locale updates, doctoring, and ScoreView-level accessibility coverage. #954 has no unique safe buyer-visible behavior that is absent from #731, so keeping both would create competing writers on ScoreViewer.tsx.

Understood. Acknowledging that this work is now obsolete as it has been superseded by #731, and stopping work on this task.