fix(clerk-js): Ensure social buttons always contain the same label format

[alexcarpenter]

Description

This PR updates social buttons rendering logic to render the same button type across all buttons when last used is true.

last use false	last used true

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:

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⚠️ No Changeset found

Latest commit: 4cfab4a

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Project	Deployment	Preview	Comments	Updated (UTC)
clerk-js-sandbox	Ready	Preview	Comment	Oct 31, 2025 5:48pm

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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/last-used-remaining-strategies

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[alexcarpenter]

closing in favor of #7169