fix(playground): errors with Tailwind due to csstree

[gabrielmfern]

---

Summary by cubic

Fixes Tailwind errors in the playground caused by csstree by switching to the @react-email/tailwind package. Removes the direct src export and adds the proper dependency.

• Bug Fixes
  • Export Tailwind from @react-email/tailwind in playground/components.ts.
  • Add @react-email/tailwind to playground/package.json and update lockfile.

^{Written for commit 2fc9d0b. Summary will update automatically on new commits.}

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Latest commit: 2fc9d0b

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Project	Deployment	Review	Updated (UTC)
react-email	Ready	Preview, Comment	Dec 18, 2025 2:04pm
react-email-demo	Ready	Preview, Comment	Dec 18, 2025 2:04pm

[cubic-dev-ai]

No issues found across 3 files