Fix transcription errors by improving audio segment handling\n\n- Add checks for empty audio segments to avoid creating invalid files\n- Pad very short audio segments to ensure Whisper compatibility\n- Use explicit WAV format with PCM_16 subtype for better compatibility\n- Add error handling around transcription to gracefully handle segment errors

Fix FileNotFoundError for example1.wav by removing non-existent example file reference

Initial commit for diarization space