ZXing TRY_HARDER (plus the inverted retry) ran on every camera frame,
pegging a core — that CPU contention is what made the preview stutter.
Decode attempts are now gated to ~7/s; KEEP_ONLY_LATEST drops the rest.
PreviewView switches to TextureView (COMPATIBLE): the SurfaceView
default punches a window hole that black-flashes inside Compose fades
and ignores rounded-corner clipping. CameraQrPreview is now shared with
the wallet scan modal.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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