Previously a second incoming call was dropped from the UI entirely when the
user was already in a call (`!joined && callInfo`). Now, when joined to a
different call, a compact corner banner (caller avatar + name + Answer/Reject)
is shown instead of the full-screen IncomingCall overlay, with a single soft
ping (one-shot ringtone) rather than the looping ring so it doesn't talk over
the active call. The full overlay still shows when not in any call; being in
the ringing room's own call still shows nothing.
Built with folds primitives + TDS tokens (no hardcoded colors).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
jared
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