Inspector: Add window/panel boundary constraints

[sunag]

Related issue: #32197

Description

When transitioning from a large screen to a small one, or when redirecting the browser, windows can get lost; this code ensures that the windows will always be visible on the screen.

[mrdoob]

			document.addEventListener( 'mousemove', onMove );
			document.addEventListener( 'mouseup', onEnd );
			document.addEventListener( 'touchmove', onMove, { passive: false } );
			document.addEventListener( 'touchend', onEnd );

		};

		resizer.addEventListener( 'mousedown', onStart );
		resizer.addEventListener( 'touchstart', onStart );

Better to use pointer events if possible.