chore: add docs on how to animate transform properties

[a1isaeed]

Summary

This PR updates the docs to clarify how to animate transform properties, based on a common confusion.

Documentation improvements:

• Added a note explaining that for animating transform properties, the entire transform object should be passed, not individual properties.
• Introduced a new section, "Animating Transforms," with an example showing how to use a derived value to construct the transform array for use with Skia components.