Refactors `GradientBlinds` to use mutable references for pointer position tracking instead of creating new objects on every `pointermove` event and animation frame. This reduces Garbage Collection overhead during high-frequency updates.
- Changes `pointerPosRef` to a stable object with an `active` flag.
- Updates `mouseTargetRef` (array) in-place instead of reassigning.
- Ensures distinct array references for dampening logic to prevent aliasing bugs.
Co-authored-by: ragusa-it <196988693+ragusa-it@users.noreply.github.com>
