Add video handling and prep utilities across nodes and UI.
- mediacomparers.py: add MxdVideoComparer (saves previews, shows A/B videos) and import folder_paths/os/time; register the new node and display name.
- wan22nodes.py: refactor WAN 2.2 scaling with _wan22_pick_bucket and _wan22_scale_image_core, add _select_frames_start_end, expose faster passthrough for scale(), add video prep nodes (WAN22_I2V_Video_Prep_MXD and advanced variant) that scale videos and return start/end/selected frames, improve CombineVideos_MXD audio handling to support multiple audio payload shapes and batching, and mark PreviewVideoMXD as an output node; register new nodes and display names.
- Add new node file wan_svi_first_last_mxd.py: WAN 2.2 First/Last I2V SVI node that prepares SVI conditioning (anchors, padding, masks) and returns latent samples.
- __init__.py: include wan_svi_first_last_mxd in dynamic imports so new node is discovered.
- web/js/image_comparer.js: extend UI to support video/media (playback, sizing, URL builder, mixed image/video lists) and update widget rendering logic for media types.
- pyproject.toml: bump package version to 1.8.1.
These changes add end-to-end video support (preview, compare, prep for WAN 2.2 workflows), improve robustness of audio concatenation, and introduce an SVI-first/last conditioning node for WAN pipelines.
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