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

[bukinoshita]

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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: 8096b52

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Project	Deployment	Preview	Comments	Updated (UTC)
react-email	Ready	Preview	Comment	Oct 10, 2025 2:57pm
react-email-demo	Ready	Preview	Comment	Oct 10, 2025 2:57pm

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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