When session groups are minimized, I can't tell where the notification badge comes from

In this screenshot, Notice the notification badge has 4 unread notifications. the 4 unread sessions are under `benvillalobos/workday`, but I can't immediately tell.

I can imagine this is more confusing when there are tons of minimized folders.


Reproduce the issue in VS Code by creating unread notifications in a session group, minimizing the group, and checking the notification badge. Start from the session-group and notification-badge UI entry points; determine how the badge can identify the minimized group containing unread sessions. Done means users can tell which minimized group accounts for the unread count, including when several groups are minimized.

Written by the indexing model from the issue text.