[$250] [HOLD for payment 2024-04-09] [CRITICAL] [Groups] Frontend (Part 1): Create Group Chats + Splits. Deprecate Group DM creation. Support viewing both Group DMs and Group Chats.

[$250] [HOLD for payment 2024-04-09] [CRITICAL] [Groups] Frontend (Part 1): Create Group Chats + Splits. Deprecate Group DM creation. Support viewing both Group DMs and Group Chats. #635433