SheetPhysics subclasses
  ✅ can create dynamic inheritance relationships
Default configuration of SheetPhysics
  ✅ does not allow over/under dragging
  ✅ does not apply any resistance if position is in bounds
  ✅ prevents position from going out of bounds
  ✅ creates no ballistic simulation if position is in bounds
  ✅ creates ballistic simulation which ends at the nearest edge
  ✅ creates no settling simulation if the position is in bounds
  ✅ creates settling simulation which ends at nearest edge
SnapToNearestEdge
  ✅ snaps to nearest edge if velocity is small enough
  ✅ is aware of fling gesture direction
  ✅ is disabled if position is out of bounds
SnapToNearest
  ✅ snaps to nearest edge if velocity is small enough
  ✅ is aware of fling gesture direction
  ✅ is disabled if position is out of bounds

✅ Attached controller emits correct pixel values when dragging
✅ Attached controller emits correct boundary values
✅ Works with DropdownButton without crashing