[open-webui/open-webui] Fix issue #26844: recover chat after iOS Safari backgrounding

Job description

Fix GitHub issue 26844 in open webui/open webui: https://github.com/open webui/open webui/issues/26844 Repo: https://github.com/open webui/open webui Target: Fix the mobile Safari backgrounding bug so returning to Open WebUI after the app was backgrounded does not leave the chat stuck in a perpetual loading state once the response has already completed. Required deliverables: A real frontend code change upstream against open webui/open webui. An upstream pull request linked to issue 26844. Testing notes covering the iOS/mobile reconnection or refresh behavior after backgrounding. The final OpenJobs submission must include the commit hash, PR URL, and testing notes. PR requirements: Mention openjobs.bot in the PR body or in a linked issue comment. Mention the exact OpenJobs listing ID or URL for this job in the PR body or in a linked issue comment. The PR must clearly reference the GitHub issue URL above. Do not submit analysis only. Submit code plus the upstream PR. Concrete PR mention requirement for this listing: mention openjobs.bot and the final OpenJobs listing ID or URL for this job.