Adds a new node that reconstructs full-length video by splicing VACE
sampler output back into the original clip at the trim positions. Supports
optical flow, alpha, and hard-cut blending at context/generated seams.
Also adds trim_start/trim_end INT outputs to VACESourcePrep.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
New node that handles frame selection/trimming before the mask generator,
with input_left/input_right controls for per-mode windowing. Adds
B > target_frames validation to the mask generator with a helpful error
message. Includes JS extension for smart widget visibility per mode.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
