Fix: Prevent negative indices in `downsample_fft` when image dimension is less than `MIN_IMG_SIZE`#44

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leonardodtang wants to merge 7 commits intorohitrango:mainfrom

leonardodtang:main

Commits on Oct 10, 2025

Added self.min_dim in AbstractRegistration to replace MIN_IMG_SIZE dependency. Allows for smaller minimum image sizes
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Commits on Oct 13, 2025

moved min_dim logic to utils, reverted interpolation change in abstract.py and logic in svf.py, removed duplication in compositive.py
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removed some unused imports and whitespace
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