This PR refactors the KeyboardMonitor implementation to use the existing generic event system instead of the legacy callback-based KeyboardEventHandler approach, providing better type safety, consistency, and maintainability.

Changes Made

New Event System Integration

• Created keyboard-specific event classes: KeyPressedEvent, KeyReleasedEvent, and ModifierKeysChangedEvent that inherit from TypedEvent<T>
• Replaced KeyboardEventHandler: The old callback-based handler is completely removed in favor of the generic EventDispatcher
• Updated KeyboardMonitor API: Now provides AddListener(), RemoveListener(), and template-based listener management methods

Platform Implementation Updates

All platform-specific implementations (Linux X11, macOS CoreGraphics, Windows Win32) have been updated to:

• Dispatch events through the generic event system instead of calling handler callbacks directly
• Use the new DispatchEvent() method to send keyboard events to registered listeners
• Maintain the same keyboard monitoring functionality with improved architecture

Backward Compatibility

• C API preserved: The existing C API (native_keyboard_monitor_* functions) continues to work unchanged by converting C callbacks to event listeners internally
• No breaking changes: Existing applications using the C API will continue to function without modification

Code Quality Improvements

• Removed deprecated code: Eliminated the entire KeyboardEventHandler class and associated callback infrastructure
• Added enum operators: Implemented bitwise operators for ModifierKey enum to enable proper flag combinations
• Unified architecture: KeyboardMonitor now follows the same event pattern used throughout the library

Benefits

• Type Safety: Events are now strongly typed with compile-time checking
• Flexibility: Supports both callback-style listeners and object-oriented event handlers
• Consistency: Uses the same event architecture as other library components
• Maintainability: Cleaner separation of concerns and easier to extend with new event types
• Performance: More efficient event dispatching through the centralized dispatcher

Testing

• ✅ All existing functionality preserved and tested
• ✅ C API backward compatibility verified with keyboard example
• ✅ New event system functionality validated with comprehensive tests
• ✅ Cross-platform build verification (Linux, macOS, Windows implementations updated)

The refactoring maintains full backward compatibility while modernizing the internal architecture to use the library's established event system patterns.

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