Review found the manual pin only chose among cameras when no screenshare
was active; during a screenshare the screenshare won the spotlight and the
pinned camera was demoted to an ignored PiP. Apply the override at the
spotlightAndPip$ level: when a pin is explicitly set, surface that camera
in the spotlight alongside the shared screen. No manual pin = unchanged.
Note: a pin persists if the pinned user briefly leaves and rejoins; the
host clears it via focus_participant{userId:null} (by design).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>