Bug A: handleAccept relied on dm_call_accepted server response to set
activeDmCall. But connectFn's async AudioContext resume yields to the
event loop, dm_call_accepted arrives during the yield, finds
isLiveKitConnected=false (connectFn just reset it), and skips
setActiveDmCall. The acceptor connects to LiveKit but the UI never
shows the call. Fix: set activeDmCall and clear incomingCall
directly in the click handler.
Bug B: ready handler no longer sets activeDmCall for active calls.
On refresh/restart the client has no LiveKit connection — showing
"Connecting..." with no connection is broken. The call exists on
the server but this client session is disconnected.