Function onElementResize

onElementResize(
element: HTMLElement,
callback: (entry: ResizeObserverEntry) => void,
): () => void
Observes size changes on a specific HTML element using ResizeObserver.
Parameters
- element: HTMLElement
  The target HTML element to observe.
- callback: (entry: ResizeObserverEntry) => void
  Called with a ResizeObserverEntry when the element resizes.
Returns () => void
A cleanup function to disconnect the observer.
Example: Usage
```
const box = document.querySelector('#box')!
const stop = onElementResize(box, (entry) => {
  console.log('Element resized:', entry.contentRect)
})

// Later, to stop observing:
stop()
```
- Defined in dom/onResize.ts:105