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/template-router/schema.ts

@@ -165,6 +165,7 @@ export const ZUpdateTemplateRequestSchema = z.object({
       language: ZDocumentMetaLanguageSchema.optional(),
       typedSignatureEnabled: ZDocumentMetaTypedSignatureEnabledSchema.optional(),
       signingOrder: z.nativeEnum(DocumentSigningOrder).optional(),
+      allowDictateNextSigner: z.boolean().optional(),
     })
     .optional(),
 });