Refactor frontend components and enhance UI consistency with Mantine

Commit notes

- Introduced ColorSchemeSync component to synchronize Mantine color scheme with Tailwind dark class. - Updated MantineProvider to use 'auto' for default color scheme. - Removed unused ADSRControls and Footer components to streamline the codebase. - Refactored BarControls and other components to utilize new icon imports for improved visual consistency. - Enhanced styles in various components for better responsiveness and dark mode support. - Cleaned up imports and optimized component structures for maintainability.