🎨 Palette: 업로드 크기 제한에 대한 동적 검증 메시지 및 일괄 업로드 총 용량 제한 추가

[seonghobae]

What: 단일 업로드 및 일괄 업로드 폼에 동적 파일 크기 제한 검증 로직 추가
Why: 하드코딩된 용량 표기 오류 방지 및 일괄 업로드 시 총 용량 초과 방지
Before/After: 5 GiB 하드코딩 -> 동적 상수 계산 적용, 일괄 업로드 시 총 용량 검증 추가
Accessibility: 커스텀 에러 메시지 및 aria-invalid 상태 업데이트

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PR created automatically by Jules for task 4272209532672658895 started by @seonghobae

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[Copilot]

Pull request overview

This PR improves the FastAPI upload UI’s client-side validation by removing hardcoded “5 GiB” strings and instead formatting the limit from the existing MAX_UPLOAD_BYTES constant, while also adding a combined-total-size validation path for batch uploads to better match the backend request-size envelope.

Changes:

• Updated single-file validation to build user-facing limit messages dynamically from MAX_UPLOAD_BYTES.
• Added batch upload total-size validation (sum of selected files) with a custom validity message and aria-invalid updates.
• Updated UI snapshot-style tests and documented the change in the changelog and Palette learning log.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
saas_web.py	Updates the embedded UI JavaScript to dynamically format size limits and validate batch total upload size.
tests/test_saas_web.py	Adjusts HTML assertions to match the new dynamic strings and new batch-total-size checks.
CHANGELOG.md	Documents the UI validation message improvements and new total-size validation.
.jules/palette.md	Records the learning/action note about avoiding hardcoded limits and validating batch totals client-side.

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[seonghobae]

Superseded by merged PR #354, which includes this dynamic size-limit feedback and aggregate batch-size prevalidation. Closing the duplicate to keep the reviewed implementation canonical.

[google-labs-jules]

Superseded by merged PR #354, which includes this dynamic size-limit feedback and aggregate batch-size prevalidation. Closing the duplicate to keep the reviewed implementation canonical.

Understood. Acknowledging that this work is superseded and closing the task.