feat(demo): use Tailwind v4 in codepen-challengers.tsx

[bukinoshita]

---

Summary by cubic

Add Tailwind support to the CodePen Challengers demo email and align @react-email/components with the Tailwind v4.1-compatible build.

• Refactors

  • Imported Tailwind from @react-email/tailwind in newsletters/codepen-challengers.tsx.

• Dependencies

  • Pinned @react-email/components to 1.0.0-tailwindv4.1.

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Latest commit: ebdcb41

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[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
react-email	Ready	Preview	Comment	Oct 2, 2025 6:58pm
react-email-demo	Ready	Preview	Comment	Oct 2, 2025 6:58pm

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​react-email/​components@​1.0.0-tailwindv4.3

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[socket-security]

All alerts resolved. Learn more about Socket for GitHub.

This PR previously contained dependency changes with security issues that have been resolved, removed, or ignored.

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_{Last updated for commit ebdcb41. This comment will update as new commits are pushed.}

[cubic-dev-ai]

No issues found across 4 files