ActionList: restore aria-describedby for inline descriptions

[liuliu-dev]

Fixes a regression introduced in #7554 where the memoization refactor accidentally moved inline Description IDs from aria-describedby into aria-labelledby. This was originally set in #7529.

Changelog

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Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
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Testing & Reviewing

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github-ui (Learn more about how to run integration tests)

[changeset-bot]

🦋 Changeset detected

Latest commit: 730869c

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

This PR includes changesets to release 1 package

Name	Type
@primer/react	Patch

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[github-actions]

⚠️ Action required

👋 Hi, this pull request contains changes to the source code that github/github-ui depends on. If you are GitHub staff, test these changes with github/github-ui using the integration workflow. Check the integration testing docs for step-by-step instructions. Or, apply the integration-tests: skipped manually label to skip these checks.

[primer-integration]

👋 Hi from github/github-ui! Your integration PR is ready: https://github.com/github/github-ui/pull/17268

[primer-integration]

Integration test results from github/github-ui:

  CI Passed
  VRT Passed
  Projects Passed

All checks passed!

[Copilot]

Pull request overview

Fixes an accessibility regression in ActionList.Item where inline ActionList.Description IDs were incorrectly included in aria-labelledby instead of aria-describedby, restoring the intended ARIA relationships for descriptions.

Changes:

• Move inline description IDs out of aria-labelledby and into aria-describedby in ActionList.Item.
• Add unit tests asserting both inline and block descriptions are referenced via aria-describedby (and not via aria-labelledby).
• Add a patch changeset documenting the fix.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/react/src/ActionList/Item.tsx	Restores correct ARIA attribute composition for inline descriptions.
packages/react/src/ActionList/ActionList.test.tsx	Adds regression tests for inline/block description ARIA wiring.
.changeset/tough-ears-drive.md	Records a patch-level changeset for the ARIA regression fix.