feat: dictate next signer (#1719)

Adds next recipient dictation functionality to document signing flow,
allowing assistants and signers to update the next recipient's
information during the signing process.

## Related Issue

N/A

## Changes Made

- Added form handling for next recipient dictation in signing dialogs
- Implemented UI for updating next recipient information
- Added e2e tests covering dictation scenarios:
  - Regular signing with dictation enabled
  - Assistant role with dictation
  - Parallel signing flow
  - Disabled dictation state

## Testing Performed

- Added comprehensive e2e tests covering:
  - Sequential signing with dictation
  - Assistant role dictation
  - Parallel signing without dictation
  - Form validation and state management
- Tested on Chrome and Firefox
- Verified recipient state updates in database

apps/remix/app/routes/_recipient+/sign.$token+/_index.tsx

@@ -1,5 +1,5 @@
 import { Trans } from '@lingui/react/macro';
-import { DocumentStatus, RecipientRole, SigningStatus } from '@prisma/client';
+import { DocumentSigningOrder, DocumentStatus, RecipientRole, SigningStatus } from '@prisma/client';
 import { Clock8 } from 'lucide-react';
 import { Link, redirect } from 'react-router';
 import { getOptionalLoaderContext } from 'server/utils/get-loader-session';
@@ -13,6 +13,7 @@ import { viewedDocument } from '@documenso/lib/server-only/document/viewed-docum
 import { getCompletedFieldsForToken } from '@documenso/lib/server-only/field/get-completed-fields-for-token';
 import { getFieldsForToken } from '@documenso/lib/server-only/field/get-fields-for-token';
 import { getIsRecipientsTurnToSign } from '@documenso/lib/server-only/recipient/get-is-recipient-turn';
+import { getNextPendingRecipient } from '@documenso/lib/server-only/recipient/get-next-pending-recipient';
 import { getRecipientByToken } from '@documenso/lib/server-only/recipient/get-recipient-by-token';
 import { getRecipientSignatures } from '@documenso/lib/server-only/recipient/get-recipient-signatures';
 import { getRecipientsForAssistant } from '@documenso/lib/server-only/recipient/get-recipients-for-assistant';
@@ -72,7 +73,24 @@ export async function loader({ params, request }: Route.LoaderArgs) {
       ? await getRecipientsForAssistant({
           token,
         })
-      : [];
+      : [recipient];
+
+  if (
+    document.documentMeta?.signingOrder === DocumentSigningOrder.SEQUENTIAL &&
+    recipient.role !== RecipientRole.ASSISTANT
+  ) {
+    const nextPendingRecipient = await getNextPendingRecipient({
+      documentId: document.id,
+      currentRecipientId: recipient.id,
+    });
+
+    if (nextPendingRecipient) {
+      allRecipients.push({
+        ...nextPendingRecipient,
+        fields: [],
+      });
+    }
+  }
 
   const { derivedRecipientAccessAuth } = extractDocumentAuthMethods({
     documentAuth: document.authOptions,