🎨 Palette: 빈 숫자 입력 필드의 인라인 유효성 검사 처리 개선

[seonghobae]

💡 What: target_bytes 및 batch_target_bytes 입력 필드에서 값이 빈 문자열로 지워졌을 때 기존에 발생했던 커스텀 유효성 검사 오류 및 aria-invalid 상태를 명시적으로 해제하도록 JavaScript 이벤트 리스너를 개선했습니다.
🎯 Why: 사용자가 유효하지 않은 값(예: 음수)을 입력한 후 백스페이스로 값을 지웠을 때, 시각적 텍스트는 지워졌지만 브라우저 내부에 유효하지 않은 상태가 남아 있어 폼 제출이나 기본 HTML5 required 동작이 올바르게 이루어지지 않거나 잘못된 오류 메시지가 표시되는 문제를 해결하기 위함입니다.
📸 Before/After: 해당 없음 (시각적 변경 없음, 동작 안정성 개선)
♿ Accessibility: 빈 상태에서 불필요하게 스크린 리더에 오류 상태(aria-invalid="true")가 남아있는 문제를 해결하여 접근성을 향상시켰습니다.

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PR created automatically by Jules for task 18190623459465020740 started by @seonghobae

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[Copilot]

Pull request overview

This PR improves the client-side inline validation behavior for the SaaS web UI’s target_bytes and batch_target_bytes numeric inputs so that clearing the field (empty string) fully resets any previously-set custom validity errors and aria-invalid state, avoiding “stuck invalid” browser constraint behavior.

Changes:

• Reset setCustomValidity('') / remove aria-invalid and clear preview output when the numeric input is emptied for both single and batch forms.
• Document the validation-reset learning/action in the Palette guidance notes.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
saas_web.py	Adds explicit empty-string handling in JS input listeners to clear custom validity + aria-invalid and reset preview output.
.jules/palette.md	Records the rationale and the recommended pattern for clearing custom validity/aria-invalid on empty numeric inputs.

Comments suppressed due to low confidence (1)

saas_web.py:297

• Same as the single-upload form: the new empty-string reset path for batch_target_bytes should be covered by a UI HTML test assertion (e.g., verify the rendered page contains the if (this.value === '') { ... } block for batch_target_bytes). This helps prevent future changes from reintroducing the stuck custom-validity/aria-invalid state.

                if (this.value === '') {
                    preview.innerText = '';
                    this.setCustomValidity('');
                    this.removeAttribute('aria-invalid');
                    return;
                }

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