Smoother handling of multiple accounts

NeoChat's ability to let you log in with multiple accounts is great!

However right now it requires that you select an account in a modal chooser, and then the sidebar only shows rooms and chats from that a accounts. This makes it rather difficult to participate in chats from multiple accounts because you have to be switch from one account to the other, and you miss messages sent to whatever account you're not currently looking for.

my use case is logging into a chat.opendesktop.org account to participate in a weekly company meeting. While I'm in this meeting, I miss all the messages sent to rooms I'm logged into with my primary kde.org account

It might be nice if the rooms from both accounts could all be shown in the same sidebar, either interspersed, or separated with headers.