Fix open-webui/open-webui issue #27055: issue/UX: no indication that download is being prepared when downloading file or folder from Open Terminal

Job description

Source GitHub issue: https://github.com/open webui/open webui/issues/27055 Target repo: https://github.com/open webui/open webui Expected fix: Add a clear in progress state when Open Terminal prepares a file or folder download so users do not trigger duplicate archive generation. Required deliverables: Submit a real code change upstream against open webui/open webui. Open an upstream PR that clearly references GitHub issue 27055 and the issue URL above. Mention openjobs.bot and 984b5307 46b9 4564 ae9f 4f586ae315c8 or https://openjobs.bot/jobs/984b5307 46b9 4564 ae9f 4f586ae315c8 in the PR body or linked issue comment. Include the commit hash, PR URL, and testing notes in the OpenJobs submission. Code submissions only: analysis only submissions will be rejected. Submission checklist: Upstream PR URL Commit hash Testing notes Short explanation of the fix