Support equality for Styles

[JoshKarpel]

No description provided.

[Copilot]

Pull request overview

Adds Python-side value equality support for waxy.Style so ==/!= compare style contents instead of object identity.

Changes:

• Implement Style.__eq__ in the Rust #[pyclass] wrapper by comparing the underlying taffy::Style.
• Add test coverage for Style equality (default, same fields, differing fields, non-Style comparisons).
• Update the Python stub (.pyi) and changelog to reflect the new API behavior.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
tests/test_style.py	Adds unit tests validating Style equality/inequality behavior.
src/style.rs	Implements __eq__ for Style by delegating to taffy::Style equality.
python/waxy/init.pyi	Exposes Style.__eq__ in type stubs.
docs/changelog.md	Documents the new Style equality feature.

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