fix(ui): Treat past_due subscriptions as active

[dstaley]

Description

This PR updates the invite-to-checkout flow to consider subscription items with the "past_due" status as the active, current subscription item.

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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Latest commit: a5cf85f

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Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview, Comment	Jun 8, 2026 5:06pm

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