fix: handle non-RGB images in BiRefNet (CMYK, grayscale, LA modes)

feat: add multi-image support (stochastic + multidiffusion)

fix: Remove fill_holes retry/skip logic — fail hard if it fails

fix: Implement optimistic concurrency retry for fill_holes (OOM safety)

fix: Convert yaw/pitch tensors to lists in render_video to fix crash

feat: Add video preview mode (8s @ 10fps), enhanced download package

ACTUAL REAL TIMING - Modified pipeline code to capture substeps

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