Add Configurable Number of Speakers Support Description

Description

Enhance the speaker diarization workflow and playback experience by introducing configurable speaker count

Add support for an optional num_speakers parameter across the transcription and diarization workflow, allowing users to either:

• use automatic speaker detection
• manually specify speaker count for deterministic diarization output

Tasks

• Extend TranscribeOptions with:

  • numSpeakers?: number | null

• Pass num_speakers through:

  • createTranscriptionJob
  • createTranscriptionJobFromFile
  • diarizeAndTranscribe

• Append value to FormData only when valid

• Add persistent React state + numSpeakersRef

• Support:

  • chunked uploads
  • full file uploads
  • benchmark analysis workflows

• Add dynamic numeric input beside diarization toggle

• Keep empty state as backend auto-detection mode

• Restrict values to max 10

Acceptance Criteria

• Empty input uses auto-detection
• Valid speaker count reaches backend correctly
• Existing transcription flows remain unaffected
• State persists correctly during audio workflows