Return the expected Turbo frame after ending a case

After fixing reset historical polls blocking case closure, meeting 9 case 01/25 ended normally through the green action and moved to completed cases. The successful HTTP 200 response triggered Turbo error: response did not contain expected `<turbo-frame id="ongoing_case_content_meeting_9">` and was ignored. Ensure successful end-case responses replace or redirect the requesting ongoing-case frame correctly, while retaining broadcasts for other clients.