Fix undefined reference to nativeapi::Menu::Create() on Linux

[Copilot]

The Linux platform implementation was missing several critical Menu and MenuItem factory methods and member functions that were declared in the header but not implemented, causing undefined reference errors during linking.

Problem

When building the menu_example or any code using the Menu API on Linux, the linker would fail with errors like:

undefined reference to `nativeapi::Menu::Create()'
undefined reference to `nativeapi::MenuItem::Create(std::string const&, nativeapi::MenuItemType)'
undefined reference to `nativeapi::MenuItem::CreateSeparator()'

This happened because the Linux implementation in src/platform/linux/menu_linux.cpp only contained basic constructor/destructor and a few methods, while the macOS and Windows implementations had complete API coverage.

Solution

Implemented the complete Menu and MenuItem API for Linux using GTK3 widgets:

Key additions:

• Global registry system: Added ID generators and object registries for proper lifecycle management
• Menu::Create(): Factory method that creates GTK menu widgets and manages C++ wrapper lifecycle
• MenuItem factory methods: Create() and CreateSeparator() with proper GTK widget creation based on MenuItemType
• Complete MenuItem API: All missing methods including SetText(), SetEnabled(), SetState(), SetAccelerator(), Trigger(), etc.
• Complete Menu API: All missing methods including AddItem(), GetItemCount(), ShowAsContextMenu(), etc.

GTK Integration:

• Maps MenuItemType to appropriate GTK widgets (GtkMenuItem, GtkCheckMenuItem, GtkRadioMenuItem, GtkSeparatorMenuItem)
• Integrates with GTK event system using g_signal_emit_by_name for menu item triggering
• Proper memory management with g_object_unref and widget lifecycle handling
• Maintains internal item collections for menu management operations

Testing

• All undefined reference errors resolved
• menu_example now compiles and links successfully on Linux
• Implementation follows same patterns as macOS version for consistency
• Full API compatibility maintained across all platforms

The Linux implementation now has complete feature parity with the declared interface and other platform implementations.

Warning

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• esm.ubuntu.com
  • Triggering command: /usr/lib/apt/methods/https (dns block)

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