React useDropZone Hook Fixes File Drop Zone Flicker Caused by Child Elements

A common bug in React drag-and-drop implementations causes the drop zone highlight to flicker when a dragged file passes over child elements inside the container. This happens because the browser fires dragenter and dragleave events on every element the cursor crosses, including nested ones, making a simple boolean toggle unreliable. The useDropZone hook from @reactuses/core solves this by using an integer counter that increments on every dragenter and decrements on every dragleave, only setting isOver to false when the counter returns to zero. The hook also handles two other frequent mistakes: the need to call preventDefault on dragover to allow drops, and converting the FileList object into a standard File array. The result is a clean TypeScript-first API that accepts a ref and an onDrop callback, returning a stable boolean without any flickering.