Migrate initial components to mergeProps

[joshblack]

Closes #

This PR contains the first bounded ADR-025 implementation batch. It migrates three reviewed component patterns without mixing changes into the tooling foundation or migration driver.

Changelog

New

Changed

• Update VisuallyHidden to merge component and consumer class names through mergeProps.
• Update TokenBase to run component keyboard behavior before consumer handlers while keeping refs separate.
• Update Radio to preserve radio semantics and compose context and consumer change handlers.

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

These changes correct existing component behavior to match the intended contracts. They do not add a supported public capability, so this batch does not include release notes.

Testing & Reviewing

Please review class-name ordering, optional handler composition, ref handling, and the Radio type invariant. The migration report should no longer list the three assigned source files.

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Latest commit: f791ad9

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[github-actions]

⚠️ Action required

👋 Hi, this pull request contains changes to the source code that github/github-ui depends on. If you are GitHub staff, test these changes with github/github-ui using the integration workflow. Check the integration testing docs for step-by-step instructions. Or, apply the integration-tests: skipped manually label to skip these checks.