Navigate predictably after meeting completion

Meeting 13 Chrome acceptance successfully ended the meeting through the typed force-end confirmation, but remained on the secretary live dashboard instead of navigating to a stable ended/report view. Other meetings showed inconsistent final destinations. Define the intended successful end-meeting destination and use a top-level Turbo redirect so the initiating client cannot remain in stale live controls, while broadcasts update other clients. Cover normal and forced meeting end, modal submissions, and no-JS HTML behavior.