Refactoring Plan for Voice Transcriber

1. Code Organization

Create a modular structure
Split main.rs into separate modules

2. Error Handling and Logging

Implement proper error handling
Add logging throughout the application

3. State Management

Refactor AppState for better management
Consider using a more robust state management solution

4. Async Code Consistency

Ensure consistent use of async/await
Implement proper cancellation for async operations

5. UI Code Improvement

Break down the build_ui function
Implement a builder pattern for UI construction

6. Configuration Management

Move hardcoded values to a configuration file
Implement a Config struct for application-wide settings

7. Type Safety Enhancements

Introduce custom types for domain-specific concepts

8. Documentation

Add documentation comments to functions and structs

9. Testing

Implement unit tests for core functionality
Add integration tests for UI and API interactions

10. Code Duplication Reduction

Extract common patterns into helper functions
Consider using macros for repetitive code

11. Performance Optimization

Profile the application for performance bottlenecks
Optimize audio processing and API interactions

12. Dependency Review

Review and update dependencies
Remove unused dependencies