fix(io): replace zero voxel spacing when reading images - #949
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A MetaImage or VTI header can declare zero or non-finite voxel spacing, and an ultrasound region can declare a zero physical delta. Slice views then render blank and the paint brush throws on every pointer move because its stencil scale divides by spacing. Zero or non-finite spacing now becomes 1 on import, with a warning that measurements along that axis are not physical. Labelmaps restored from a session get the same repair so they keep the parent grid. Ultrasound region spacing is applied only when both deltas are nonzero and finite. Negative spacing is kept because its sign places the voxels.
A zero or non-finite PhysicalDeltaX or PhysicalDeltaY is broken calibration, and measurements silently fell back to the image pixel spacing. Report it to the user instead of only the console.
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Images with zero or non-finite voxel spacing left slice views blank and made the paint brush throw. Such spacing now becomes 1, and ultrasound regions with a zero delta are ignored, both with a warning.