animate add padding

[black-eleven]

[gemini-code-assist[bot]]

Summary of Changes

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This pull request enhances the video processing pipeline within the "wan_animate_runner" by introducing robust padding and dimension alignment utilities. These changes ensure that input video frames are appropriately resized and padded to meet the specific resolution and stride requirements of the underlying VAE model, preventing potential dimension-related errors and improving compatibility.

Highlights

• Video Padding Utility: Introduced a new "video_letterbox_pad" method to resize and letterbox pad video frames, maintaining aspect ratio and filling remaining space with a specified color.
• Dimension Alignment: Added a "make_hw_area_multiple_of_k" utility to adjust dimensions (height and width) to ensure their product is a multiple of a given factor "k", with minimal padding.
• Source Preparation Enhancement: Integrated the new padding and dimension alignment utilities into the "prepare_source" method to ensure "cond_images" are correctly sized and padded according to VAE stride requirements before processing.

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