[FEATURE REQUEST] Collapse Big Teams

After using Keybase for some time, it can be cumbersome to manage a large list of Chats [especially on mobile, but I'm specifically speaking about the Desktop application at the moment.) I would appreciate an option to collapse/expand the Teams I am a member of, and/or have a reduced display while collapsed, where only channels with new messages show while the parent team is in this collapsed state.

Partially mentioned in #17987

Start by reading the issue body and the related discussion in #17987 to understand the existing direction. Inspect the desktop chat team list and determine how a collapse/expand control and reduced collapsed view would fit. Done means users can collapse and expand teams, with channels showing new messages remaining visible when the team is collapsed.

Written by the indexing model from the issue text.