🎨 Palette: 필수 입력 필드 초기화 시 유효성 검사 접근성 피드백 유지

[seonghobae]

💡 What: 필수 입력 필드에서 값을 지웠을 때 발생하는 접근성/UX 문제를 해결했습니다.
🎯 Why: 기존에는 숫자를 지우거나 선택된 파일을 초기화했을 때 에러 메시지가 빈 문자열로 바뀌고 aria-invalid 속성이 삭제되어 폼 제출은 막혀있으나 무엇이 문제인지 사용자나 스크린 리더에게 명확히 전달되지 않았습니다. 이제는 "This field is required."라는 명시적인 인라인 에러와 붉은색 텍스트, 그리고 aria-invalid="true"가 설정되어 직관적인 피드백을 줍니다.
📸 Before/After: 이전에는 값을 비우면 초록색 텍스트가 사라지고 그냥 빈 상태로 남았으나, 이제 붉은 색 에러 텍스트가 표시됩니다.
♿ Accessibility: 에러 상태가 스크린 리더로 다시 명시적으로 전달될 수 있도록 aria-invalid="true" 속성의 동적 변경을 구현했습니다.

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PR created automatically by Jules for task 15559688941373365336 started by @seonghobae

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📥 Commits

Reviewing files that changed from the base of the PR and between a8e4956 and c18d861.

📒 Files selected for processing (4)

• .jules/palette.md
• saas_web.py
• tests/test_empty_target_validation.py
• tests/test_saas_web.py

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✅ Devin Review: No Issues Found

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[seonghobae]

Fresh successor verification: #540 (063745bd693062cdda66258faf258d30181e806b) fully carries and strengthens the valid #455 contract for cleared required single/batch file and target inputs. It retains This field is required. + custom validity + aria-invalid=true, adds stale-presentation cleanup, native-invalid/listener readiness and stronger focused tests. The .jules/palette.md generalization is generated doctrine and is not a unique product delta.

No #455 check/review transfers. #540 remains Draft pending #558 dependency foundation, central CodeQL settlement, material browser/AT evidence and current-head review. Closing #455 is verified-successor consolidation, not completion.

[google-labs-jules]

Fresh successor verification: #540 (063745bd693062cdda66258faf258d30181e806b) fully carries and strengthens the valid #455 contract for cleared required single/batch file and target inputs. It retains This field is required. + custom validity + aria-invalid=true, adds stale-presentation cleanup, native-invalid/listener readiness and stronger focused tests. The .jules/palette.md generalization is generated doctrine and is not a unique product delta.

No #455 check/review transfers. #540 remains Draft pending #558 dependency foundation, central CodeQL settlement, material browser/AT evidence and current-head review. Closing #455 is verified-successor consolidation, not completion.

Understood. Acknowledging that this work is now obsolete and stopping work on this task.