Enhanced the `CreateEnvelopeWizardPopup` component:
- Added a new grid layout (`sender-create-wizard__body-layout`) to separate main content and side panel.
- Introduced a collapsible side panel for document upload and preview.
- Replaced old upload logic with `PdfFileDropZone` and added support for displaying document metadata (name, size) and replacement hints.
- Added asynchronous document preview rendering with `EnsureDocumentPreviewPreparedAsync`.
Localization updates:
- Added new localized strings for document upload hints in `de-DE`, `en-US`, and `fr-FR`.
CSS updates:
- Styled the new layout and side panel with transitions.
- Updated `PdfFileDropZone` styles for different states (e.g., document uploaded).
Refactored code for better maintainability and improved user feedback during document upload and preview preparation.
TekH
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