feat: remove sx prop from Announce, AriaAlert, AriaStatus

[joshblack]

Closes#6783
Closes#6782
Closes#6781

Remove the sx prop from our live region helper components. Also refactors our polymorphic types to (hopefully) make this transition from styled component wrappers (or Box components) easier 🤞

Changelog

New

• Add new polymorphic props helper to make transition from Box/styled easier

Changed

Removed

• Remove sx prop from Announce, AriaAlert, AriaStatus

Rollout strategy

• Major release; if selected, include a written rollout or migration plan

There is no sx usage downstream so we can safely rollout this breaking change 🚀

[changeset-bot]

🦋 Changeset detected

Latest commit: ac61422

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 removes the sx prop from live region helper components (Announce, AriaAlert, AriaStatus) as part of transitioning away from styled components. The changes introduce a new polymorphic props helper to ease the migration from Box/styled components while maintaining type safety and component functionality.

Key changes:

• Removes sx prop support from live region components
• Introduces new PolymorphicProps type helper for better polymorphic component handling
• Refactors component type definitions to use the new polymorphic pattern

Reviewed Changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/react/src/live-region/Announce.tsx	Replaces Box component with polymorphic implementation, removes sx prop support
packages/react/src/live-region/AriaAlert.tsx	Updates type definitions to use new PolymorphicProps helper, removes sx prop
packages/react/src/live-region/AriaStatus.tsx	Updates type definitions to use new PolymorphicProps helper, removes sx prop
packages/react/src/live-region/__tests__/Announce.test.tsx	Removes test case for sx prop functionality
.changeset/spotty-colts-hear.md	Documents breaking change for major version release

[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	89.49 KB (-0.01% 🔽)
packages/react/dist/browser.umd.js	89.59 KB (+0.11% 🔺)

[primer-integration]

👋 Hi from github/github-ui! Your integration PR is ready: https://github.com/github/github-ui/pull/2367

[primer-integration]

🟢 ci completed with status success.