The previous choices made it seem like potentially destructive actions
were being performed. I've gone with neutral colours and more suiting
icons to attempt to avoid this.
---
Addresses concerns in
https://github.com/ppy/osu/discussions/31621#discussioncomment-11948377.
I chose this design even though it wasn't the #1 most popular because I
personally feel that using green/red doesn't work great for these.
It proved to be too difficult to deal with the flow that clears user
states on stopping the watching of global presence updates. It's not
helped in the least that friends are updated via the API, so there's a
third flow to consider (and the timings therein - both server-spectator
and friends are updated concurrently).
Simplest is to separate the friends flow, though this does mean some
logic and state duplication.
