[WIP] Refactor the Display struct in display.h to use the PIMPL idiom pattern similar to window.h, converting it from a struct to a class with private implementation details hidden behind a forward-declared Impl class and pimpl_ pointer.

[Copilot]

• Analyze the current Display struct implementation in display.h
• Examine how Window class uses the PIMPL idiom as a reference
• Identify all files that use the Display struct
• Build and verify current codebase works
• Create Display.cpp implementation file with PIMPL pattern
• Refactor display.h to convert struct to class with private implementation
• Update platform-specific display_manager implementations to work with new Display class
• Update C API to work with new Display class
• Update display events to work with new Display class
• Build and test changes
• Verify all examples and tests still work

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