AIMixer/ComfyUI_MiniMaxH3_Director ? reverse-engineered prompt

Build me a ComfyUI custom node plugin for MiniMax H3 that acts like a simple director desk for making longer videos in multiple segments.

I want one main node where I can upload or reference video, split it into parts, edit the timeline, add prompts for each segment, and generate the final result with picture and sound together. It should support text to video, image to video, first and last frame video, reference based video, video to video, and reference plus video editing. Please include a clean timeline view with thumbnails, segment selection, and the option to only run some segments. If possible, add import and export for a project pack so I can save and share the whole setup with assets.

Use the official ComfyUI MiniMax H3 nodes and current docs if you need to look anything up. Make it work with the sample workflows too, and keep the UI friendly enough that a normal user can understand it without knowing the internals.