Updated the `disabled` attribute logic in `EnvelopeViewer.razor`
to ensure navigation buttons are always active when signatures
exist. Modified `pdf-viewer.js` to enable infinite looping for
signature navigation, allowing users to cycle between the first
and last signatures seamlessly. Adjusted `canGoPrev` and
`canGoNext` properties to depend on the total number of
signatures, ensuring navigation is always enabled when
signatures are present.
TekH
5bed9c932f