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
Introduces the ability for users with the **Assistant** role to prefill
fields on behalf of other signers. Assistants can fill in various field
types such as text, checkboxes, dates, and more, streamlining the
document preparation process before it reaches the final signers.
