Introduced functionality to render interactive signature buttons on the PDF viewer. Added support for fetching and displaying signature data (`SignatureDto`) dynamically based on the current page.
- Added `@using` directives in `EnvelopeViewer.razor` for required namespaces.
- Introduced `_signatures` field to store signature data.
- Updated `OnInitializedAsync` to fetch and process signatures.
- Implemented `RenderSignatureButtonsAsync` to dynamically render buttons.
- Added `[JSInvokable]` method `OnSignatureButtonClick` for button events.
- Updated CSS to style `pdf-signature-layer` and `signature-button`.
- Enhanced `pdf-viewer.js` with methods to render and clear buttons.
- Ensured buttons respond to zoom and page navigation changes.
- Added error handling and logging for signature rendering.
These changes improve user interaction by enabling signing functionality directly on the PDF viewer.
TekH
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