feat: add embedded envelopes (#2564)

## Description

Add envelopes V2 embedded support

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Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

apps/remix/app/components/general/direct-template/direct-template-page.tsx

@@ -9,7 +9,7 @@ import { useNavigate, useSearchParams } from 'react-router';
 import { RECIPIENT_ROLES_DESCRIPTION } from '@documenso/lib/constants/recipient-roles';
 import type { TTemplate } from '@documenso/lib/types/template';
 import { isRequiredField } from '@documenso/lib/utils/advanced-fields-helpers';
-import { getDocumentDataUrl } from '@documenso/lib/utils/envelope-download';
+import { getDocumentDataUrlForPdfViewer } from '@documenso/lib/utils/envelope-download';
 import { trpc } from '@documenso/trpc/react';
 import { Card, CardContent } from '@documenso/ui/primitives/card';
 import { DocumentFlowFormContainer } from '@documenso/ui/primitives/document-flow/document-flow-root';
@@ -154,9 +154,9 @@ export const DirectTemplatePageView = ({
         <CardContent className="p-2">
           <PDFViewer
             key={template.id}
-            data={getDocumentDataUrl({
+            data={getDocumentDataUrlForPdfViewer({
               envelopeId: template.envelopeId,
-              envelopeItemId: template.envelopeItems[0].id,
+              envelopeItemId: template.envelopeItems[0]?.id,
               documentDataId: template.templateDocumentDataId,
               version: 'current',
               token: directTemplateRecipient.token,