Fix Linux compilation errors in platform-specific code

[Copilot]

This PR fixes multiple compilation errors in the Linux platform-specific implementation files under src/platform/linux/. The errors were preventing the library from building on Linux systems.

Issues Fixed

KeyboardMonitor (keyboard_monitor_linux.cpp)

• Fixed constructor initialization list that referenced non-existent event_dispatcher_ member
• Updated event dispatching to use inherited EmitSync() method instead of missing DispatchEvent()
• Removed incorrect DispatchEvent() method implementation

Menu System (menu_linux.cpp)

• Fixed parameter type mismatches (changed std::string to const std::string& to match header declarations)
• Fixed destructor to properly handle unique_ptr members (removed manual delete calls)
• Removed implementations of non-existent methods (SetTitle, GetTitle, CreateItem)
• Added missing GetNativeItem() implementation for MenuItem
• Updated Menu methods to use shared_ptr<MenuItem> parameters as expected by the interface

TrayIcon (tray_icon_linux.cpp)

• Fixed TrayIcon::Impl to use shared_ptr<Menu> instead of attempting to copy non-copyable Menu objects
• Removed implementations of deprecated callback setter methods that don't exist in the header
• Fixed shared_ptr access in context menu methods

WindowManager (window_manager_linux.cpp)

• Fixed implementation class name from WindowManagerImpl to Impl to match header forward declaration
• Fixed member variable name from impl_ to pimpl_ to match header
• Updated event dispatching to use inherited EmitSync() method

DisplayManager (display_manager_linux.cpp)

• Added missing destructor implementation to resolve linking errors

Testing

All Linux platform-specific files now compile successfully without errors:

• The nativeapi library builds cleanly on Linux
• Platform-specific compilation errors are resolved
• No functional changes were made - only interface compatibility fixes

The changes are minimal and surgical, focusing exclusively on fixing compilation issues while preserving all existing functionality.

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