feat(scanner): migrate from drag-to-zoom to pinch-to-zoom#690
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Replace drag-to-zoom with iOS-style pinch-to-zoom using anchored start zoom, pow(1.3) power curve, 20x hard cap, and lerp smoothing for gradual lens-switch transitions. Tap-to-focus no longer triggers zoom.
Show a pill badge with the current zoom level (e.g. 1.0x) below the top bar while a pinch gesture is active. Fades in/out with the gesture. Signed-off-by: Brandon McAnsh <git@bmcreations.dev>
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