fix(web): editor text color when the browser's in light mode

[gabrielmfern]

production:

in this pull request:

---

Summary by cubic

Fixes unreadable editor text in light-mode browsers by forcing dark theme inside the editor preview container. Ensures consistent contrast and readability.

• Bug Fixes
  • Add dark class to .example-shell-content to apply dark styles regardless of system theme.

^{Written for commit b8afc85. Summary will update on new commits.}

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Project	Deployment	Actions	Updated (UTC)
react-email	Ready	Preview, Comment	Apr 19, 2026 9:22pm
react-email-demo	Ready	Preview, Comment	Apr 19, 2026 9:22pm

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Latest commit: b8afc85

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[cubic-dev-ai]

No issues found across 1 file

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.