Enabled PDF printing in `SenderPdfImageEditor` and `SenderPdfImageEditorToolbar`. Added `CanPrintPdf` property to determine print availability and a new `OnPrintPdfAsync` method for handling print logic via JavaScript interop. Updated the toolbar with a "Print" button that triggers the print functionality.
Implemented the `printDataUrlPdf` function in `envelope-editor.js` to handle printing from a data URL. This function creates an iframe, loads the PDF, and invokes the browser's print functionality with proper cleanup of resources.
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