GPU Motion Blur has received another round of visual and stability improvements.

• Circular cursor movement now produces a natural curved blur instead of straight streaks.
• Reduced subtle cursor position jumps during rapid movement.
• Improved GPU presentation stability while keeping the effect responsive.
• Curved blur is carefully limited to prevent unnatural rings or lingering trails.
• Expanded regression coverage for cursor roles, multi-monitor rendering, click-through behavior, and GPU effects.