fix(segmentation): resample mismatched labelmap index grids - #945
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Importing a labelmap whose axes are reflected or rotated relative to its parent can skip resampling because both images cover the same physical space. Require matching index extents and transforms before reusing the scalar buffer, with corresponding world-corner checks to bound accumulated transform error. Differing grids use the existing label resampler.
Preserve unordered physical-space grouping and correct its corner enumeration to use each axis's own extent.
Validation: 17 focused tests, including a real-WASM import regression placing a reflected label at parent row 2 instead of row 0; TypeScript and full ESLint checks.