Reduced wizard steps from 5 to 4 by merging document upload into step 3. Added a new localized hint (`SenderWizard_FinalUploadHint`) to guide users during the final document upload. Removed redundant document preview functionality and associated UI elements.
Refactored the document upload area to always remain visible on the right side of the wizard, using the `PdfFileDropZone` component. Removed the "Skip" button for optional steps and cleaned up unused methods, properties, and CSS classes.
Updated step titles and descriptions to reflect the new flow. General code cleanup to simplify logic and improve maintainability.
TekH
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