Removed the `ZoomLevelChanged` parameter from the `DxPdfViewer`
component in `EnvelopeReceiverPage.razor` due to lack of support
in the installed `DevExpress.Blazor.PdfViewer` package version
`25.2.3`. This prevents runtime exceptions caused by the use of
an unsupported parameter.
Deleted the `OnViewerZoomLevelChanged` method, as it is no longer
needed. Updated `RECEIVER_PDF_VIEWER_CONTEXT.md` to reflect the
limitations of the installed package and adjusted the recovery
plan to bind zoom state directly to `DxPdfViewer.ZoomLevel`.
Simplified zoom handling by removing custom JavaScript logic for
`ctrl+wheel` zoom and retaining the overlay redraw pipeline.
Confirmed that the built-in DevExpress zoom UI now works without
runtime errors, and custom zoom duplication has been eliminated.
TekH
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