chore(react-router): TypeScript 6.0 compatibility

[dstaley]

Description

Updates @clerk/react-router to be compatible with TypeScript 6.0 by moving to tsdown and modifying the exports to prevent the same collision issues solved in #8204

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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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Skipped		Mar 30, 2026 10:20pm

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Latest commit: aefc079

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