Implement macOS menu logic and streamline related features - Added `setupDarwinMenu` for macOS-specific menu handling. - Removed manual `Menu.setApplicationMenu` call in favor of modular setup. - Cleaned up unused keyboard shortcuts, including Shift + F4 for resetting Last.fm keys. - Updated Discord RPC activity with conditional display options for small SoundCloud icon. - Simplified Last.fm integration by removing redundant error logging.