Adapt Button to styled-react and remove sx

[pksjce]

Working on #6760

Changelog

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: 562b7d9

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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[Copilot]

Pull Request Overview

This PR adapts the Button component to the styled-react package and removes the sx prop implementation from the main @primer/react package. The changes introduce custom styled-react implementations for Button, IconButton, and ActionMenu components that support the SxProp interface for backward compatibility.

Key changes:

• Creates new styled-react wrapper components for Button, ActionMenu, and IconButton
• Moves CSSCustomProperties type to a shared location in sx.ts
• Updates package exports to use the new styled-react implementations

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/styled-react/src/sx.ts	Adds CSSCustomProperties type export for shared use
packages/styled-react/src/index.tsx	Updates exports to use new styled-react components instead of direct @primer/react exports
packages/styled-react/src/components/PageHeader.tsx	Updates import to use shared CSSCustomProperties type
packages/styled-react/src/components/IconButton.tsx	Creates new styled-react wrapper for IconButton with sx prop support
packages/styled-react/src/components/Button.tsx	Creates new styled-react wrapper for Button with custom sx prop handling
packages/styled-react/src/components/ActionMenu.tsx	Creates new styled-react wrapper for ActionMenu with sx prop support

[Copilot]

Replace @ts-ignore with proper TypeScript typing. Consider extending the SxProp type to include color or use type assertion instead of suppressing the error.

Suggested change

	// @ts-ignore sx can have color attribute
	const {color} = sx
	const {color} = sx as {color?: string}

[Copilot]

Replace @ts-expect-error with proper type resolution. The type mismatch should be resolved by properly typing the component props or using a type assertion.

Suggested change

	// @ts-expect-error type mismatch between Box usage here and PrimerButton
	return <Box {...rest} as={PrimerButton} style={style} sx={sxStyles} />
	// Type assertion used to resolve type mismatch between Box and PrimerButton
	return (<Box {...rest} as={PrimerButton} style={style} sx={sxStyles} />) as JSX.Element

[Copilot]

Fix spacing inconsistency in the comment. Should be 'width: 320px' with consistent spacing around the colon.

[primer-integration]

😢 Hi from github/github-ui. The integration workflow has failed: https://github.com/github/github-ui/actions/runs/17979041956

[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!