Voice Mode Beta with Transcribe and Cross-Platform Audio Integration

### Checks

- [x] I have searched [github.com/aws/amazon-q-developer-cli/issues](https://github.com/aws/amazon-q-developer-cli/issues?q=) and there are no duplicates of my issue
- [x] I have run `q doctor` in the affected terminal session
- [x] I have run `q restart` and replicated the issue again

### Operating system

macOS 15.5.0 (24F74)

### Expected behaviour

Implement a professional voice interface for Amazon Q CLI that allows users to interact using voice commands. The feature should include:

- Voice input using CPAL (Cross-Platform Audio Library) for audio capture
- AWS Transcribe integration for speech-to-text conversion
- Intuitive voice UI with clear visual feedback
- Professional user experience with proper error handling
- Voice activation with `/voice` command

### Actual behaviour

Currently working on voice mode implementation in the voice-beta branch (commit 27ac24fa). The feature includes:

- Voice interface integration with transcribe and CPAL
- Improved voice UI and UX documentation
- Beta testing capabilities

This is a feature request/enhancement to track the development and testing of the voice mode functionality.

### Steps to reproduce

1. Checkout the voice-beta branch from the fork
2. Build the project: `cargo run --bin chat_cli`
3. Start chat mode: `./target/debug/chat_cli chat`
4. Activate voice mode: `/voice`
5. Test voice input functionality