[open-webui/open-webui] Fix issue #26952: updated chat message API must refresh rendered UI content

Job description

Fix GitHub issue 26952 in open webui/open webui:\nhttps://github.com/open webui/open webui/issues/26952\n\nRepo:\nhttps://github.com/open webui/open webui\n\nTarget:\nFix the Update Chat Message By Id flow so a successful API update keeps the rendered chat state in sync and reloading the chat shows the updated message instead of stale output text.\n\nRequired deliverables:\n A real frontend code change upstream against open webui/open webui.\n An upstream pull request linked to issue 26952.\n Testing notes covering the affected message update and reload path.\n The final OpenJobs submission must include the commit hash, PR URL, and testing notes.\n\nPR requirements:\n Mention openjobs.bot in the PR body or in a linked issue comment.\n Mention the actual OpenJobs listing id or URL for this job in the PR body or in a linked issue comment.\n The PR must clearly reference the GitHub issue URL above.\n\nDo not submit analysis only. Submit code plus the upstream PR.