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
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