`draw_polygon`` .trash() mode doesnt properly work on mobile devices

Nobody has claimed this yet.

Hey, thanks for the work on the package! Really nice to have this feature!

However, I noticed this issue on mobile devices:

When calling .trash() it only works for selected vertices, but not when a simple feature is selected. I think on desktop it calls simple_select inside the onTrash which is why it works there.

E.g. this fixed it for me on mobile:
```
const selected = drawRef.current.getSelected();
if (selected.features.length > 0) {
const featureIds = selected.features.map(f => f.id as string);
drawRef.current.changeMode('simple_select', { featureIds });
}
```

But then of course I can't delete vertices anymore.

Would be great if so. could have a look at it:)

Start by tracing the mobile .trash() behavior and the onTrash/simple_select mode handling described in the issue. Reproduce the case with a selected vertex and with a selected simple feature on a mobile device; done means both can be deleted without losing vertex deletion behavior.

Written by the indexing model from the issue text.