🎨 Palette: [UX improvement] 접근성 향상을 위한 빈 상태(Empty State) 화면 속성 추가

[seonghobae]

💡 무엇을: 검색 결과나 일정 후보, 메일 목록 등이 없을 때 표시되는 "결과 없음" 화면에 role="status"와 aria-live="polite" 속성을 추가했습니다.
🎯 왜: 스크린 리더 사용자가 화면 갱신 시 빈 상태가 되었음을 안내받을 수 있도록 접근성을 개선했습니다.
📸 Before/After: 시각적 변경사항은 없습니다.
♿ Accessibility: 스크린 리더가 동적 콘텐츠 변경으로 인한 "빈 상태"를 인식하고 부드럽게 안내할 수 있도록 개선했습니다.

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PR created automatically by Jules for task 6016150495420723877 started by @seonghobae

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📒 Files selected for processing (6)

• .jules/palette.md
• frontend/src/components/DecisionPointCard.tsx
• frontend/src/components/EmailList.tsx
• frontend/src/components/SearchLayout.tsx
• frontend/src/components/WorkspaceHome.tsx
• frontend/src/components/mobile-workspace-panels.tsx

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