🎨 Palette: 비활성화 버튼의 툴팁 접근성 개선

[seonghobae]

💡 What: Button 컴포넌트의 HTML disabled 속성을 aria-disabled로 교체하고 클릭 이벤트를 차단하도록 수정했으며 tooltip (title)을 추가했습니다. Button 클래스에서 사용하지 않는 disabled를 제거했습니다.
🎯 Why: HTML disabled 속성이 스크린 리더와 포인터 이벤트를 차단하여 툴팁이 작동하지 않는 문제를 해결하기 위함입니다.
📸 Before/After: 해당 없음 (동작 변경)
♿ Accessibility: 시각 장애인 및 마우스 사용자가 비활성화된 버튼의 툴팁 내용을 확인할 수 있게 되어 접근성이 향상되었습니다.

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PR created automatically by Jules for task 8360991608235642463 started by @seonghobae

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📥 Commits

Reviewing files that changed from the base of the PR and between acdbea6 and d781c62.

📒 Files selected for processing (5)

• apps/desktop/src/App.test.tsx
• apps/desktop/src/components/ui/button.tsx
• apps/desktop/src/features/score/ScoreView.test.tsx
• apps/desktop/src/features/score/ScoreView.tsx
• apps/desktop/src/features/score/ScoreViewer.test.tsx

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[seonghobae]

Closing as superseded by the earlier canonical accessibility owner #731 after fresh exact-head comparison.

Exact comparison at this decision point:

• 🎨 Palette: 비활성화 버튼의 툴팁 접근성 개선 #908 head: d781c623dcf6f095de11971c5a12fc93a948a542, based directly on protected develop@acdbea6344fe1231c39535b575f4de35e4c607c9, with zero review threads.
• 🎨 Palette: 향상된 접근성을 위해 아이콘 버튼에 툴팁 및 aria-disabled 적용 #731 head: 81cc280be112c601002067d76412b33fdb6fed4e, also based on protected develop, and already owns the score-open/remove and PDF-pagination disabled-action accessibility contract.

The buyer-visible score behavior in #908 is already covered more narrowly and completely by #731: focusable aria-disabled controls, activation prevention at the score action boundary, aria-describedby, localized EN/KO recovery/tooltips, and direct regression assertions. #908's remaining unique change is a global mutation of the shared Button primitive that converts every consumer's native disabled contract into aria-disabled and derives title from aria-label. That broadens semantics across unrelated buttons without a corresponding cross-component requirement or regression inventory, while not adding the localized unavailable-reason contract that #731 already provides for the affected score controls.

No unique accepted product behavior is being discarded: keep #731 as the canonical owner and revalidate it after the dependency/security prerequisites land. Do not transfer #908 checks or evidence to #731.