- Introduced `ValidateUnsubscribeLink` endpoint in `MailingsController`.
- Refactored `UnsubscribeListsController` to inherit from `BaseController`.
- Added `Url` property to `UnsubscribeList` and updated related mappings.
- Enhanced `IMailingService` and `MailingService` for unsubscribe link handling.
- Implemented validation logic in `MailingEdit.tsx` with confirmation dialogs.
- Updated `TemplateEdit.tsx` for inserting unsubscribe links in templates.
- Improved sorting functionality in `CompletedMailings` and `ScheduledMailings`.
- Added `UnsubscribeValidationResult` interface for validation results.
David Headrick
9f6b1ae74c