- Camera and screen-share badges are decided by `shouldShowStreamIndicator`,
so a live stream is visible from outside the voice channel and clicking the
badge joins the streamer's channel before focusing the stream.
- `ringParticipants` reports whether a `direct-call` ring reached anyone; a
call that reached nobody shows `call.errors.ringUndelivered` instead of
sitting in "calling" as if it were live.
- Direct messages resolve every local identity alias, so a conversation
opened from a foreign roster entry lands in the same thread.
myxelium
3266581d3c