feat: react email support

[olliethedev]

Note

Medium Risk
Adds a new extension surface (pageTypeRenderers/pageTypeCodeGenerators) that changes how pages are created, rendered, and exported, plus new email-specific rendering/codegen utilities; mistakes could affect editor canvas behavior and exported output across page types.

Overview
Adds page-type extensibility to UIBuilder via pageTypeRenderers and pageTypeCodeGenerators, letting the editor route canvas rendering and code export per-page based on page.pageType (including registry filtering for the add-component popover).

Updates core UI to support this: the NavBar page-creation popover now includes a page-type selector and passes default root layer type/props when creating pages; EditorPanel/preview dialog can delegate rendering to a custom page-type renderer (with optional skipAutoFrame); CodePanel can replace the default React tab with a page-type-specific generator + label.

Introduces React Email support: a react-email component registry, emailPageRenderer/emailCodeGenerator, Tailwind email theme config + EmailTailwindThemePanel, and canvas-safe component substitutes; includes a full email builder demo route and new docs/README guidance. Also adds a Tailwind theme panel override (tailwindThemePanel: ReactNode | false), improves layers drag/drop persistence for string-children nodes, and tightens tests/mocks accordingly.

^{Written by Cursor Bugbot for commit 0b853f2. This will update automatically on new commits. Configure here.}

[github-actions]

✅ Registry test passed! The registry files have been automatically updated with your changes.

[github-actions]

✅ Registry test passed! The registry files have been automatically updated with your changes.

[github-actions]

✅ Registry test passed! The registry files have been automatically updated with your changes.

[github-actions]

✅ Registry test passed! The registry files have been automatically updated with your changes.

[github-actions]

✅ Registry test passed! The registry files have been automatically updated with your changes.

[github-actions]

✅ Registry test passed! The registry files have been automatically updated with your changes.

[github-actions]

✅ Registry test passed! The registry files have been automatically updated with your changes.

[github-actions]

✅ Registry test passed! The registry files have been automatically updated with your changes.

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

^{Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

[github-actions]

✅ Registry test passed! The registry files have been automatically updated with your changes.