v1.1.0

Fix remote audio, zoom and gesture handling

Audio no longer plays on the thread that receives video: frames land in
a small queue that a dedicated player thread drains, so a stalled
AudioTrack can never hold up decoding. The player is only built when
the Mac actually accepted audio, tearing one down happens outside the
session lock, and stopping joins the writer before releasing the track.

Pinch now zooms the phone's own view only, instead of zooming here and
magnifying the Mac at the same time; two fingers pan while zoomed in
and still scroll the Mac at normal size. A short settle window is back,
so the small movement as a second finger lands no longer nudges the
cursor, while a deliberate drag still moves it right away.