Owners and admins can now connect a channel from the phone: Menu › Channels › Connect a channel, then pick the channel. The platform's own sign-in opens in a window inside the app, already signed in to MirageCHAT; close it and you are back. A channel that stopped working shows Reconnect on its card.
Every button in the app that opens a page of the website now opens it signed in, and the page stays on the website instead of jumping back into the app. It says Opened from the MirageCHAT app. When you are done, close this window and the app shows the change.