Add skeletal implementation of NSGestureRecognizer

[gcasa]

Implement Gesture recognition logic

[Copilot]

Pull Request Overview

This PR implements skeletal implementations of several NSGestureRecognizer subclasses and enhances NSEvent to support magnification gestures. The implementation provides a comprehensive gesture recognition framework with concrete recognizers for common gesture types.

• Implements NSGestureRecognizer base class with state management, target-action patterns, and delegate support
• Adds concrete gesture recognizers for click, pan, press, rotation, and magnification gestures with complete event handling
• Extends NSEvent to support magnification properties for enhanced gesture recognition capabilities

Reviewed Changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
NSGestureRecognizer.m	Core gesture recognizer base class implementation with state management and event handling
NSClickGestureRecognizer.m	Click gesture recognizer with button mask and multi-click support
NSPanGestureRecognizer.m	Pan gesture recognizer with translation/velocity tracking and multi-button support
NSPressGestureRecognizer.m	Press-and-hold gesture recognizer with timer-based duration validation
NSRotationGestureRecognizer.m	Rotation gesture recognizer supporting both mouse and scroll wheel input
NSMagnificationGestureRecognizer.m	Magnification gesture recognizer for zoom operations
NSEvent.m	Enhanced mouse event creation and serialization to support magnification data
Headers/AppKit/*.h	Updated header files with comprehensive documentation and API definitions

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[gcasa]

I think this PR is ready as well, @fredkiefer / @rfm