Fix frame alignment error in WanVideoAnimateEmbeds

[MackinationsAi]

Fixed a tensor reshaping error in WanVideoAnimateEmbeds that occurred when processing videos w/ frame counts not divisible by 4. The fix trims excess frames (max 3) to ensure proper alignment w/ the 4-frame latent processing pipeline.

Issue

WanVideoAnimateEmbeds fails w/ RuntimeError: shape '[1, X, 4, H, W]' is invalid for input of size Y when processing videos where the frame count is not divisible by 4 b/c some videos can have arbitrary frame counts (e.g., 77, 83, 165 frames).

Fix

Added frame alignment check before reshaping:

• Calculates the largest frame count divisible by 4
• Trims excess frames w/ minimal data loss (≤3 frames regardless of video length)
• Logs the operation for transparency
• Ensures tensor reshaping occurs & prevents crashes for videos with non-aligned frame counts
• Maintains backward compatibility for properly aligned videos