Add size prop to ActionList.Item

[langermank]

Closeshttps://github.com/github/primer/issues/4587

Changelog

Aligning(ish) with PVC. We seem to offer an xlarge in Primer View Components but I don't think it's used, nor do I know a use case for it.

New

Changed

Removed

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; if selected, include a brief description as to why

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 (Learn more about how to run integration tests)

[changeset-bot]

🦋 Changeset detected

Latest commit: aa33939

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	Minor

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[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github depends on. If you are GitHub staff, we recommend testing these changes with github/github using the integration workflow. Thanks!

[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	92.32 KB (+0.13% 🔺)
packages/react/dist/browser.umd.js	92.4 KB (+0.01% 🔺)

[Copilot]

Pull Request Overview

This PR adds a size prop to ActionList.Item components to support different item heights, aligning with Primer View Components. The feature allows items to be rendered in either "medium" (default) or "large" sizes.

Key changes:

• Added a new size prop with "medium" and "large" options to ActionList.Item
• Updated styling to support larger padding for the "large" size variant
• Added comprehensive testing coverage including visual regression tests

Reviewed Changes

Copilot reviewed 9 out of 18 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/react/src/ActionList/shared.ts	Added size prop type definition and updated ItemContext
packages/react/src/ActionList/Item.tsx	Implemented size prop with default value and data attribute
packages/react/src/ActionList/ActionList.module.css	Added CSS styles for large size variant
packages/react/src/ActionList/ActionList.stories.tsx	Added size control to Storybook playground
packages/react/src/ActionList/ActionList.features.stories.tsx	Added LargeItem story demonstrating the feature
packages/react/src/ActionList/ActionList.docs.json	Updated API documentation with size prop
e2e/components/ActionList.test.ts	Added visual regression test for large items
packages/react/src/NavList/snapshots/NavList.test.tsx.snap	Updated snapshots with new data-size attribute
.changeset/yellow-sheep-dress.md	Added changeset for minor release