fix(dicom): match ITK pixel-spacing axis order#886
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Single-slice DICOM images previously ignored PixelSpacing entirely — spacing was only applied when
slices > 1, so single slices rendered at [1, 1, 1]. DICOM PixelSpacing is also [row, col] while VTK/ITK spacing is [x, y].This applies PixelSpacing to single-slice images (swapped to [x, y] order so non-square pixels are no longer transposed), adds a SpacingBetweenSlices fallback for single-slice Z spacing, and falls back to PixelSpacing for cine clips when no spatial ultrasound region exists.