chore: drop Node 18 support through the engines property

[gabrielmfern]

Summary by cubic

Require Node 22+ across the repo by updating all package.json engines. The preview dev server now blocks Node <20 on startup.

• Migration
  • Use Node 22+ locally and in CI (installs fail below 22 with engines-strict).
  • Update Docker images and runtime environments to Node 22+.
  • Bump Node versions in any downstream packages that rely on our engines field.
  • If you use the preview server, it exits with an error on Node <20.

^{Written for commit f6dbc94. Summary will update automatically on new commits.}

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Project	Deployment	Preview	Comments	Updated (UTC)
react-email	Ready	Preview	Comment	Oct 30, 2025 3:55pm
react-email-demo	Ready	Preview	Comment	Oct 30, 2025 3:55pm

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@react-email/preview

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react-email

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@react-email/render

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@react-email/row

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@react-email/section

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@react-email/text

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commit: f6dbc94

[cubic-dev-ai]

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