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.
Switch to a designer-generated DevExpress XtraReport for envelope history, replacing the previous manual layout. Added designer (.Designer.cs), resource (.resx), and updated code-behind (.cs) files. Updated the project file to include new report assets. Changed report generation to use the new async API. This modernizes the report, improves maintainability, and enhances appearance.
