- Replaced `SignatureService` with `DocReceiverElementService` in DI.
- Refactored `envelope-action-bar` for better readability and added badges for `2FA`, `Access Code`, and `Signature Count`.
- Improved error handling and loading states with clearer messages.
- Enhanced PDF viewer toolbar with better navigation, zoom, and signature controls.
- Added resizable thumbnail sidebar with persistent width settings.
- Refactored signature popup to support draw, text, and image tabs with validation.
- Improved JavaScript interop for PDF rendering and signature handling.
- Introduced DevExpress PDF Viewer as an alternative implementation.
- Consolidated state management and improved code readability.
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