Confirmation pending inside sub-agent still unclear.

Testing #328653

When I have multiple sub-agents running and one of them or multiple of them have different confirmations pending, I can tell that the new sub-agent UX has a coloring which is meant to help associate the current pending tool confirmation with the sub-agent. However, it's still quite hard because they can be very distant from each other on the screen. Further, the title of the confirmation shows the type of sub-agent, but it doesn't give me any relation with the name that's actually on the pill.