chore(ToggleSwitch): add aria-label to preview stories

[francinelucca]

Authors: Please fill out this form carefully and completely.

Reviewers: By approving this Pull Request you are approving the code change, as well as its deployment and mitigation plans.
Please read this description carefully. If you feel there is anything unclear or missing, please ask for updates.

What are you trying to accomplish?

Adds aria-label prop to preview ToggleSwich stories

Screenshots

Before:
(no aria name on button)

After:
(aria name on button)

Integration

N/A

List the issues that this change affects.

Closes https://github.com/github/accessibility-audits/issues/14754

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?

Confirmed the aria-label can be provided through system props, so just added aria-labels to preview stories to remediate the a11y issue.

Anything you want to highlight for special attention from reviewers?

Accessibility

• No new axe scan violation - This change does not introduce any new axe scan violations.

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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[Copilot]

Pull request overview

Adds a default accessible name to the Primer::Alpha::ToggleSwitch button so it no longer renders without an ARIA name.

Changes:

• Introduces a default accessible name ("toggle switch") when no aria-label is provided.
• Adds aria-label into the merged button ARIA attributes alongside aria-pressed.

Comments suppressed due to low confidence (1)

app/components/primer/alpha/toggle_switch.rb:82

• This change introduces new accessibility behavior (default aria-label + preserving any custom label). There are existing component tests for ToggleSwitch, but none currently assert the rendered button has an accessible name; adding/adjusting a test to cover the default label and that a custom aria-label is not overwritten would prevent regressions.

          aria: merge_aria(
            @system_arguments,
            aria: { pressed: on?, label: @accessible_name}
          )

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[Copilot]

@francinelucca I've opened a new pull request, #3870, to work on those changes. Once the pull request is ready, I'll request review from you.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

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[francinelucca]

@copilot open a new pull request against the main branch to apply changes based on the comments in this thread

[Copilot]

@francinelucca I've opened a new pull request, #3871, to work on those changes. Once the pull request is ready, I'll request review from you.

[TylerJDev]

I think you were planning on adding changes, so approving in advance!