feat(clerk-js): Add initial sign-in combined flow

[alexcarpenter]

Description

Introduce experimental combined sign in flow.

<SignIn
  __experimental: {
    combinedFlow: true,
  }
/>

Screen.Recording.2024-11-20.at.9.36.25.AM.mov

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]

🦋 Changeset detected

Latest commit: 719dd8e

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

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Name	Status	Preview	Comments	Updated (UTC)
clerk-js-sandbox	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 22, 2024 8:27pm