What problems was I solving

The DataGrid search component defined two useCallback wrappers, onPrevMatchPointerDown and onNextMatchPointerDown, that forwarded pointer events to onTriggerPointerDown without adding logic or differentiation. These wrappers were unnecessary overhead and added noise to the component.

What user-facing changes did I ship

None. This is an internal refactoring that preserves the existing pointer-down behavior of the previous/next match buttons.

How I implemented it

Removed the two wrapper callbacks from DataGridSearchImpl and wired the prev/next match button onPointerDown props directly to onTriggerPointerDown.

Description for the changelog

Removed no-op useCallback wrappers around the DataGrid search prev/next match pointer-down handlers and passed onTriggerPointerDown directly to the buttons. No user-facing behavior changed.