refactor of preview to avoid rechunking#988
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_snap_factor no longer has a max_ratio gate — it always returns a divisor of the chunk size (falling back to 1). The rechunk path in _reduce_dask and _aligned_chunk_size are removed entirely. When the snapped factor overshoots the target (e.g. 1680 instead of 1000), a second pass computes the small intermediate and subsamples to the exact requested dimensions in-memory.
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