fix(spinner): render sr-only live region for assistive tech (#11531)

[Rodrigoue9]

Title

fix(spinner): render sr-only live region for assistive technology announcements (#11531)

Description

• Updates Spinner in new-york-v4 and radix registries to render a sibling <span role="status" className="sr-only">{label}</span> element.
• Sets aria-hidden="true" on the spinning svg icon to avoid empty live regions or mangling button accessible names.
• Adds optional label prop (defaults to "Loading") for localisability.

Closes #11531

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