Adds misc:debounce_drag config option to control mouse event debouncing
during window dragging and resizing operations.
Values:
- 0: Force off (always disabled, maximum smoothness)
- 1: Force on (always enabled, helpful for low-polling mice)
- 2: Auto (default, enabled on ≤60Hz monitors, disabled on >60Hz)
The original debounce logic (from #4553) was always enabled and helped
prevent stuttering on 60Hz monitors with low-polling mice (~125Hz), but
caused slightly reduced responsiveness on high-refresh setups. This change
makes the behavior adaptive by default while allowing manual override.
7df4e3a2e8