macOS reports trackpad pinch as wheel events with ctrlKey=true, but
Cesium's default zoomEventTypes only binds plain WHEEL (no modifier),
so pinch was silently ignored — only two-finger scroll worked.
Adds the CTRL-modified WHEEL binding so Cesium recognizes pinch as a
zoom gesture, plus a capture-phase relay that amplifies the pinch
event's deltaY before Cesium processes it, since macOS reports much
smaller deltaY per unit of finger movement for pinch than for scroll
(same fixed Cesium formula otherwise made pinch feel unresponsive).
