Keyboard playback viewer
In addition to terminal output, the system is also capturing terminal input from the user. At the moment, this data is not accessible through any part of the UI. One possible method to use this data is to show session inputs as an on-screen keyboard display. This improve discovery of mysterious keyboard shortcuts that a viewer might see in a playback.
Initially, this could be a separate UI sub-mode of the session viewer, but in the future, both could be shown simultaneously in a multi-pane view.