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

packages/trpc/server/recipient-router/router.ts

@@ -436,12 +436,13 @@ export const recipientRouter = router({
   completeDocumentWithToken: procedure
     .input(ZCompleteDocumentWithTokenMutationSchema)
     .mutation(async ({ input, ctx }) => {
-      const { token, documentId, authOptions } = input;
+      const { token, documentId, authOptions, nextSigner } = input;
 
       return await completeDocumentWithToken({
         token,
         documentId,
         authOptions,
+        nextSigner,
         userId: ctx.user?.id,
         requestMetadata: ctx.metadata.requestMetadata,
       });