Lazy Mouse: show a stroke trail instead of only a gray circle

When Lazy Mouse is enabled, the viewport only shows a gray circle for the delayed brush. While painting, that circle does not show the path the brush will follow, so it is hard to predict the stroke before it is applied.

Please add a trail line for the Lazy Mouse preview. The line should run from the cursor to the delayed brush position and follow the stroke path, updating as the cursor moves. This would make the brush trajectory visible while drawing, instead of only marking the delay distance with a circle.

The trail should be a viewport guide only and should not change the painted result.