feat: implement ElevenLabs audio generation for podcast conversations

- Add ElevenLabs SDK integration for text-to-speech conversion
- Implement automatic audio generation after conversation completion
- Add comprehensive audio playback controls (play/pause/restart)
- Include real-time debug panel for monitoring audio generation process
- Add proper error handling for quota exceeded and other API errors
- Integrate audio stream processing and buffer concatenation
- Add volume control and progress tracking for audio playback
- Include responsive UI states for audio generation and playback

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

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