Remove Box usage and sx prop from NavList and related components

[mperrotti]

Relates to https://github.com/github/primer/issues/5424 and https://github.com/github/primer/issues/5425

Closes#6768

Changelog

New

Changed

sx prop was removed from NavList and its subcomponents

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: 24be459

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

This PR includes changesets to release 2 packages

Name	Type
@primer/react	Major
@primer/styled-react	Major

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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!

[Copilot]

Pull Request Overview

This PR removes the sx prop and Box component usage from NavList and its related components as part of migrating away from the styled-system approach. The changes move styling from JavaScript-based sx props to CSS modules while maintaining backward compatibility through a styled-react wrapper.

Key changes:

• Removed sx prop support from all NavList components and subcomponents
• Replaced Box component usage with native HTML elements
• Migrated inline styles to CSS modules for GroupHeading component

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
packages/styled-react/src/components/NavList.tsx	Added wrapper components that re-add sx prop support via Box wrapping for backward compatibility
packages/react/src/NavList/NavList.tsx	Removed sx prop from all components, replaced Box usage with native HTML elements, migrated GroupHeading styles to CSS modules
packages/react/src/NavList/NavList.module.css	Added CSS module styles for GroupHeading link styling
packages/react/src/NavList/NavList.docs.json	Removed sx prop documentation from all NavList components
packages/react/src/ActionList/shared.ts	Updated ActionList types to support modern polymorphic components
packages/react/src/ActionList/List.tsx	Migrated ActionList to use modern polymorphic pattern
packages/react/src/ActionList/Item.tsx	Updated ActionList.Item to use modern polymorphic pattern

[joshblack]

@mperrotti I linked: #6768 to this issue if that's okay! Seems like it would close it if I'm understanding right

[primer-integration]

👋 Hi from github/github-ui! Your integration PR is ready: https://github.com/github/github-ui/pull/3267

[primer-integration]

🟢 ci completed with status success.

[mperrotti]

This PR will pass integration tests with the following changes to the ref callback type: https://github.com/github/github-ui/pull/3266

[hectahertz]

🚀

[github-actions]

👋 Hi, there are new commits since the last successful integration test. We recommend running the integration workflow once more, unless you are sure the new changes do not affect github/github. Thanks!

[github-actions]

👋 Hi, there are new commits since the last successful integration test. We recommend running the integration workflow once more, unless you are sure the new changes do not affect github/github. Thanks!