Enhanced `appsettings.json` with `ApiOptions` and `PdfViewerOptions` for better customization of rendering and zoom behaviors.
Added comprehensive styles in `envelope-viewer.css` for the layout, toolbar, thumbnails, and responsive design of the envelope viewer.
Introduced `receiver-signature.js` to manage signature functionality, including drawing, typed, and image-based signatures, as well as dynamic annotation checkboxes.
Integrated `Typed.js` (UMD version) for typing animations with configurable speeds, looping, and event hooks.
TekH
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