Move video out of the voice drawer into a fixed-position stage that
covers the lobby above the drawer. Remote canvas fills the stage with
object-fit: contain; local preview is a 200x112 PiP in the bottom-right.
Placeholder shows "Waiting for remote video" with a frame counter until
the first frame arrives. Counter logs first remote frame to console for
debugging.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
cbc3a8d37e