feat(ui,shared): Add TXT domain verification to self-serve SSO

[LauraBeatris]

Description

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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Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview, Comment	Jun 10, 2026 9:29pm
swingset	Error		Jun 10, 2026 9:29pm

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commit: 48b1b81