fix(clerk-js): Improve focus-visible contrast to improve a11y

[alexcarpenter]

Description

Improve focus-visible contrast/visibility.

resolves USER-3687

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

[changeset-bot]

⚠️ No Changeset found

Latest commit: 0e89ae9

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Project	Deployment	Preview	Comments	Updated (UTC)
clerk-js-sandbox	Ready	Preview	Comment	Oct 28, 2025 0:32am

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch alexcarpenter/user-3687-wcag-failure-focus-indicator-has-insufficient-color-contrast

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