Removed `@rendermode="InteractiveAuto"` from `<HeadOutlet />` and `<Routes />` in `App.razor` to adjust rendering mode. Updated `EnvelopeReceiverPage_DxPdfViewer.razor` to use `DevExpress.Blazor.PdfViewer` instead of `DevExpress.Blazor`. Added `@using DevExpress.Blazor` to `_Imports.razor` for project-wide access to DevExpress components. Embedded `Resources\Invoice.pdf` in `EnvelopeGenerator.WebUI.csproj` and added the PDF file to the project.
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