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/api/v1/implementation.ts

@@ -323,6 +323,7 @@ export const ApiContractV1Implementation = tsr.router(ApiContractV1, {
         dateFormat: dateFormat?.value,
         redirectUrl: body.meta.redirectUrl,
         signingOrder: body.meta.signingOrder,
+        allowDictateNextSigner: body.meta.allowDictateNextSigner,
         language: body.meta.language,
         typedSignatureEnabled: body.meta.typedSignatureEnabled,
         distributionMethod: body.meta.distributionMethod,