Preview now centers at the sensor aspect ratio (letterboxed on the dark
backdrop) instead of FittedBox cover, which cropped ~38% horizontally and
made the preview differ from the full-frame takePicture output.
Zoom capability hangs off CaptureSource as default implementations
(minZoom/maxZoom = 1, setZoom no-op) so existing fakes stay untouched;
CameraPluginSource probes getMin/MaxZoomLevel after initialize (failure
keeps 1/1 and disables the gesture). The page attaches a scale
GestureDetector only when maxZoom > 1: pinch drives setZoom (throttled at
0.05 delta, serialized to prevent out-of-order platform calls), a badge
shows the current level and hides after 1s, double-tap resets to 1.0x,
and camera flip/reopen resets zoom state. _StaticCaptureSource in
album_detail_page_test.dart switches implements -> extends to inherit the
new defaults.
Co-Authored-By: Claude Code <noreply@anthropic.com>
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