Important

This PR adds email theme management with CRUD operations, updates schema and config for email themes, and enhances UI components and tests.

• Email Themes Management:
  • Added CRUD operations for email themes in admin-interface.ts and admin-app-impl.ts.
  • Introduced ChatContent type and related functions for handling email theme chat messages.
  • Added renderEmailThemePreview, createEmailTheme, getEmailTheme, and updateEmailTheme functions.
• Schema and Config Updates:
  • Updated schema.ts and schema-fields.ts to include emailThemeSchema and emailThemeListSchema.
  • Set default email themes in organizationConfigDefaults in schema.ts.
• UI Components:
  • Added ResizablePanelGroup, ResizablePanel, and ResizableHandle in resizable.tsx.
  • Updated BrowserFrame in browser-frame/index.tsx to support transparent backgrounds.
• Tests:
  • Added tests for email theme endpoints in email-themes.test.ts and render-email.test.ts.
  • Updated existing tests to reflect changes in email theme handling.

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