🎨 Palette: 숫자 입력 필드의 빈 문자열에 대한 유효성 검사 처리 개선

[seonghobae]

💡 What: target_bytes 및 batch_target_bytes 입력 필드에서 사용자가 값을 지워 빈 문자열이 되었을 때 커스텀 유효성 검사 에러와 aria-invalid 속성을 명시적으로 해제하도록 개선했습니다.
🎯 Why: 사용자가 숫자를 수정하기 위해 입력란을 모두 지웠을 때 "Must be greater than 0."라는 잘못된 에러 메시지가 표시되어 혼란을 주는 문제를 해결합니다. 빈 문자열일 경우 HTML5 기본 required 속성이 자연스럽게 작동하도록 보장합니다.
📸 Before/After: 빈 문자열 입력 시 더 이상 커스텀 에러 텍스트나 빨간 테두리가 표시되지 않습니다.
♿ Accessibility: 빈 필드에 대해 스크린 리더가 불필요하게 유효하지 않은 상태(aria-invalid="true")라고 잘못 읽어주는 문제를 방지합니다.

---

PR created automatically by Jules for task 10497190804455258626 started by @seonghobae

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.

[Copilot]

Pull request overview

This PR improves the client-side inline validation behavior for the target_bytes and batch_target_bytes numeric inputs in saas_web.py so that when a user clears the field to an empty string, any previously-set custom validation error and aria-invalid state are explicitly reset—allowing native HTML5 required validation to behave naturally and avoiding misleading “Must be greater than 0.” feedback.

Changes:

• Add an explicit early-return branch for this.value === '' in both numeric input input event handlers to clear setCustomValidity, remove aria-invalid, clear the preview text, and reset preset button aria-pressed.
• Document the “empty string handling” lesson and action item in .jules/palette.md for future UI validation work.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
saas_web.py	Resets custom validity + ARIA invalid state on empty numeric input to prevent incorrect error UX and improve accessibility behavior.
.jules/palette.md	Adds a learning log entry describing the empty-string reset pattern for numeric input inline validation.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.