Remove sx prop support from ToggleSwitch

[liuliu-dev]

Migrates the ToggleSwitch component away from Box components and sx prop support to use CSS modules, closes #4826

What Changed

• Removed Box wrapper and sx prop support from the main ToggleSwitch component

• Replaced sx prop styling with CSS modules and data attributes for state-based styling

• Added ToggleSwitch to the styled-react package for repos still using sx props

• Note: SwitchButton and ToggleKnob still use styled-components (styled.button and styled.div) and will be migrated in a future iteration

Rollout strategy

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

[changeset-bot]

🦋 Changeset detected

Latest commit: 81b9da0

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

This PR includes changesets to release 3 packages

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

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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	90.17 KB (-0.13% 🔽)
packages/react/dist/browser.umd.js	90.41 KB (-0.05% 🔽)

[primer-integration]

👋 Hi from github/github! Your integration PR is ready: https://github.com/github/github/pull/397774

[primer-integration]

🔴 golden-jobs completed with status failure.