Enable smooth scrolling for nested scrollers also

Currently the style only applies to the root scroller `html`, missing nested scrollers. This will match any of them that use url hash targets inside. Also adds scroll padding. Nice use case shown by [Kevin here](https://www.youtube.com/watch?v=cCAtD_BAHNw).

```css
@media (--motionOK) {
:where(:has(:target)) {
scroll-behavior: smooth;
scroll-padding-block-start: max(2rem, 5svb);
}
}
```