Introduced a document preview feature in the `CreateEnvelopeWizardPopup` component. This includes:
- Injected `PdfRenderService` for rendering PDF pages.
- Replaced document metadata display with a preview card.
- Added `SenderPdfImageEditor` for interactive PDF previews.
- Implemented state management for preview pages and overlays.
- Added fallback logic to estimate PDF page count.
- Enhanced `ResetWizardState` to reset preview-related fields.
- Styled the preview card and wrap with new CSS classes.
- Added placeholder event handlers for editor interactions.
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