Updated ReportCreator and ReportItem to accept EnvelopeDto
instead of Envelope, promoting better separation of concerns
and improved data handling via DTOs.
Moved mapping logic from ReportCreator.ToReportItem to a new constructor in ReportItem, improving encapsulation and simplifying report generation. Updated usings to remove unused and add necessary dependencies.
Replaces obsolete DataTable-based logic in ReportCreator with async repository queries for EnvelopeReport entities. Refactors ReportItem to use explicit header and detail fields, removing legacy Envelope references. Updates report designer bindings to match new ReportItem properties. Improves exception handling and overall type safety.
