Add Model/Speed/Subagent count to activity view sidebar

What variant of Codex are you using?

App

What feature would you like to see?

Would be nice to see a little more info on the activity view - consider adding the model (to understand which things are running with low vs high thinking), speed (to understand which things are costing more usage, and subagent count (to understand which things have potentially much larger fanout cost)

Additional information

_No response_