Subscribes to viewtop's gaze feed and dispatches a synthetic pointer move on
the canvas, so live2d.js's own mousemove path drives head angle and eye
direction with its existing damping. Synthetic is the point: she is
deliberately not being given those contacts, and this lets her watch them
anyway.
Screen coordinates in, her window's coordinates out — the origin comes from
the compositor's furniture report rather than assumed, because the layout
decides it and it moves with the zone.
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