039a832b79
Adds a dialog to test email settings and integrates with the `/api/settings/test/email` API endpoint. - Added a "Test Email" button to the Mail Settings tab. - Implemented a dialog for entering the recipient email and selecting a template. - Added UI elements for the dialog (input fields, radio buttons, and a send button). - Updated `src/services/settingsService.ts` to include the test email API call. - Added UI components for the dialog (using existing UI components). - Updated `src/components/settings/general/MailSettingsTab.tsx` to include the test email functionality.