Feature Request: toMatchStyleSnapshot, toMatchInlineStyleSnapshot

[greypants]

I'd be great to have an API to take snapshots of just styles or specific rules. The API would be basically the same as toHaveStyleRule, but would do snapshot generation/matching instead.

// All styles as normal snapshot
expect(component).toMatchStyleSnapshot()
// Single rule as inline snapshot
expect(component).toMatchInlineStyleSnapshot('transform')

That would prevent users from having to manually record the output, and is much more terse than taking a snapshot of the entire DOM tree and every style.

[quantizor]

This is a well-defined feature request. Closing #117 as a duplicate of this issue, as it proposes the same concept.

The proposed API aligns well with Jest conventions:

• toMatchStyleSnapshot()—snapshot all CSS rules for a component
• toMatchInlineStyleSnapshot('color')—inline snapshot a single rule

The implementation would build on the existing CSS extraction logic in getCSS() and the class name detection in the matcher. Keeping this open as a valid enhancement.