perf: use libvips thumbnail for shrink-on-load - #21
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Downscale via thumbnail_buffer so large JPEG/WebP/HEIF masters are not fully decoded before resize; cover crops keep center-fill behavior.
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Summary
thumbnail_bufferso large JPEG/WebP/HEIF masters are not fully decoded before resize.w+h) by thumbnail-to-fill then center-crop.Test plan
cargo test(includes large JPEG downscale case)wtransform; confirm correct dimensionsw+hstill center-fillsw/hunchanged