[iamnbutler]

Follow-ups to #490 from the move study and review:

• Hosted channels keep the channel # icon in the sidebar, the Chat tab and the dashboard; the radar icon is gone. The channel header's machine indicator shows a cloud when the channel is hosted.
• Each move item says where tools run ("Chat moves; tools stay on this Mac", "Chat and tools move to a cloud container"). The study tester couldn't tell "cloud" from "cloud workspace" from the labels alone (confusion 2).
• "Move to this host" names this host as the app does (its tailnet name) instead of the OS hostname, which the tester saw as H72Q5YQ4CG while the app showed natembp.
• More space after the machine name and after the new-tab button in the channel header.

Built in Ace

No. Written in Claude Code on the Mac while it led the study, since the Mac's Ace Canary was the build under test. Dogfooding gap tracked in #5.