Add missing SR announcement in Summary As Button story

[llastflowers]

What are you trying to accomplish?

• Address a11y remediation issue
• Add missing sr announcement in Summary As Button Lookbook story

Integration

N/A

List the issues that this change affects.

Relates to https://github.com/github/accessibility-audits/issues/14766

Risk Assessment

• Low risk the change is small, highly observable, and easily rolled back.
• Medium risk changes that are isolated, reduced in scope or could impact few users. The change will not impact library availability.
• High risk changes are those that could impact customers and SLOs, low or no test coverage, low observability, or slow to rollback.

What approach did you choose and why?

is always present and only visibility is toggled, so SR does not announce it when it appears (after clicking the button). This adds a hidden announcer that is updated when the element opens.

Anything you want to highlight for special attention from reviewers?

N/A

Accessibility

Fix for a11y audit remediation issue

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Lookbook)
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge

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[changeset-bot]

🦋 Changeset detected

Latest commit: 1616537

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/view-components	Patch

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[Copilot]

Pull request overview

This PR addresses an accessibility remediation issue by adding a screen reader announcement for the Summary As Button Lookbook story. The change ensures that when the details element is toggled open, screen readers announce the descriptive text that becomes visible.

Changes:

• Added a hidden live region element that announces content to screen readers when the details element is toggled
• Implemented a toggle event handler to update the live region with the appropriate message

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[liuliu-dev]

Looks great! ✨