fix(web): copy code component accessibility

[yanthomasdev]

This PR adds screen reader-only text to the copy-code.tsx component with aria-live to give feedback once the content is copied.

This is meant to make it compliant with WCAG's Success Criterion 1.1.1: Non-text Content (Level A), ensuring the button's purpose and state, represented by an icon, can be understood by users of assistive technologies.

Changes were tested on Windows 11, Chrome, NVDA. For reference, before the announcement would be "button", now "button, copy to clipboard" and "copied" after clicked.

I haven't opened an issue since it wasn't clear if they should be opened for issues/bugs outside the library itself. Let me know if one's necessary.

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Summary by cubic

Adds a screen reader–only live region to the copy-code button so assistive tech announces “Copy to clipboard” and “Copied.” This clarifies the button’s purpose and state and aligns with WCAG 1.1.1.

^{Written for commit 187e0ff. Summary will update on new commits.}

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[cubic-dev-ai]

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