feat(editor): add Inspector.Document defaults and EmailTheming validation

[joaopcm]

Summary

• Inspector.Document now renders default sections (Background + Container) when no children are passed
• Inspector.Provider throws a clear error if EmailTheming extension is missing

Usage

// Default rendering — Background and Container sections
<Inspector.Document />

// Custom rendering — same render-props API as before
<Inspector.Document>
  {({ findStyleValue, setGlobalStyle }) => (
    <div>...</div>
  )}
</Inspector.Document>

Context

Final PR in the inspector sidebar redesign stack (PRODUCT-1739). Stacked on top of #3188 (section components).

Test plan

• pnpm lint:fix passes
• All 119 existing inspector tests still pass
• children prop is now optional on Inspector.Document
• EmailTheming validation throws at render time (fail-fast)

---

Summary by cubic

Adds default Background and Container sections to Inspector.Document when no children are provided, and adds a fail-fast check in Inspector.Provider for the EmailTheming extension. Supports PRODUCT-1739 (inspector sidebar redesign).

• New Features

  • Inspector.Document renders Background + Container by default when no children are passed.
  • children is now optional; the render-props API is unchanged.
  • Inspector.Provider throws a clear error if EmailTheming is missing.

• Migration

  • Ensure the EmailTheming extension is included in your editor setup (e.g., EmailTheming or EmailTheming.configure({...})).

^{Written for commit 864665c. Summary will update on new commits.}

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Project	Deployment	Actions	Updated (UTC)
react-email	Ready	Preview, Comment	Apr 7, 2026 3:32pm
react-email-demo	Ready	Preview, Comment	Apr 7, 2026 3:32pm
react-email-examples	Ready	Preview, Comment	Apr 7, 2026 3:32pm

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commit: 864665c