Give inputs unique ids so that SR doesn't skip Label announcement

[llastflowers]

What are you trying to accomplish?

• Address a11y remediation issue
• Make SR announce the label associated with a multi-input in all cases

Integration

N/A

List the issues that this change affects.

Addresses https://github.com/github/accessibility-audits/issues/14774

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?

The label was not being announced when the initial selection was changed because the inputs did not have unique IDs. Now that they have unique ids, the label will always be announced regardless of selection state.

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: 7d2e5c8

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 improves the accessibility of the MultiInput form control so that screen readers consistently announce its label, and wires that behavior into the axe/preview tooling and metadata.

Changes:

• Ensure form labels have stable, unique id attributes derived from the input base_id, and wire multi-input children to reference those labels via aria-labelledby.
• Update the MultiInput DSL to give each constituent input a unique id, associate it with the shared label, and keep hidden inputs disabled while still present in the DOM.
• Extend accessibility configuration (axe skip rules and static preview/info architecture JSON) for the MultiInput visually-hidden-label scenario and add a changeset for @primer/view-components.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
static/previews.json	Updates the multi_input/visually_hide_label preview’s skip_rules.wont_fix to include the label-title-only rule so CI reflects the expected a11y exception.
static/info_arch.json	Mirrors the preview configuration by adding label-title-only to wont_fix for the multi_input/visually_hide_label preview entry in the information architecture metadata.
lib/primer/accessibility.rb	Adds a per-component wont_fix rule for Primer::Alpha::MultiInput’s visually_hide_label scenario and normalizes scenario_name (string vs symbol) before looking up scenario-specific axe rules.
app/lib/primer/forms/form_control.html.erb	Ensures every label rendered by the forms FormControl wrapper has a deterministic id (label-<base_id>) while still respecting any explicitly provided id.
app/lib/primer/forms/dsl/multi_input.rb	Adjusts decorate_options so each child input in a multi-input gets a unique id and an aria-labelledby pointing at the shared label, and keeps hidden inputs disabled to avoid server submission.
.changeset/hip-flies-pretend.md	Records a patch release for @primer/view-components summarizing the new unique-ID behavior for multi-input labels.

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