fix(editor): reset margin/padding on the minimal mode

[danilowoz]

---

Summary by cubic

Reset body margin and padding to 0 in the editor’s minimal theme to remove unwanted spacing and ensure consistent email rendering. Moved defaults into the theming config and added support for margin as a CSS property.

• Bug Fixes

  • Minimal mode: body margin and padding now default to 0 via theme (RESET_BASIC, THEME_MINIMAL) to eliminate browser spacing.
  • Removed inline margin/padding from Body in @editor and rely on mergedStyles.body.

• New Features

  • Added margin to SUPPORTED_CSS_PROPERTIES and types (px, default 0) for theme-level control.

^{Written for commit 467fbe5. Summary will update on new commits.}

[changeset-bot]

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Latest commit: 467fbe5

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Project	Deployment	Actions	Updated (UTC)
react-email	Ready	Preview, Comment	Jul 22, 2026 5:06pm
react-email-demo	Ready	Preview, Comment	Jul 22, 2026 5:06pm

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commit: 467fbe5

[cubic-dev-ai]

No issues found across 3 files

Confidence score: 5/5

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

<sub>Auto-approved: Moves body margin/padding reset into the theme configuration and adds margin as a supported CSS property, enabling user customization. No behavioral change in minimal mode.

Re-trigger cubic</sub>