Refactor frontend components to enhance audio control features and improve UI consistency

Commit notes

- Updated BpmControl component to utilize new icon imports for better visual consistency. - Enhanced GainMeter component with volume cycling functionality and integrated track gain updates to the audio worklet. - Removed unused width prop from GainMeter for cleaner code. - Refactored AudioEngineProvider to synchronize audio node references with the audio engine's internal state. - Added functionality to send track gain updates to the audio worklet, improving audio processing accuracy. - Cleaned up imports and optimized component structures for maintainability.