[App & API] Improved 720p Quality for Image to Video

The 720p option in Image to Video now delivers significantly enhanced visuals and motion quality.

This update brings the 720p output much closer to 1080p results, with:

• More natural model and camera movement for smoother, more lifelike motion.

• Improved facial identity preservation, ensuring models remain consistent across frames.

• Better product detail fidelity, maintaining sharper textures and realistic lighting.

• Refined aesthetic quality, matching the visual polish of our higher resolutions.

These improvements apply across both the app and API versions of Image to Video, providing a better balance between visual quality and generation cost.