支持通过拖动标题栏退出最大化

[neveler]

close #5138

[Copilot]

Pull request overview

This PR implements support for exiting the maximized window state by dragging the title bar, addressing feature request #5138. When a maximized window's title bar is dragged, the window should un-maximize and follow the cursor.

Changes:

• Enabled mouse event handling when window is maximized
• Added logic to detect dragging on maximized windows and exit maximized state

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[Copilot]

When exiting maximized state during a drag operation, only mouseInitX is being updated but mouseInitY is not. This will cause incorrect vertical positioning when the user drags the window. Both coordinates should be updated to ensure the window follows the cursor properly. Additionally, stageInitX and stageInitY should be set to the new window position after un-maximizing to ensure proper drag calculations.

Suggested change

	mouseInitX = primaryStage.getWidth() / 2;
	// Reinitialize drag reference points after restoring from maximized state
	mouseInitX = mouseEvent.getScreenX();
	mouseInitY = mouseEvent.getScreenY();
	stageInitX = primaryStage.getX();
	stageInitY = primaryStage.getY();
	stageInitWidth = primaryStage.getWidth();
	stageInitHeight = primaryStage.getHeight();