When the page is zoomed in very close, such that <30% of the page is in view, it doesn't register changes to the 'current page'. This fixes that, passing in the 'centerPage' if 'visiblePages' is empty.
I don't love this fix, i think the visiblePages should always have *something* in it, but I can't quite figure out how to set that (since the normal update to visiblePages is happening in an observer that doesn't fire if nothing is in view).
the `safe` keyword for `justify-content`, in combo with `center`, means that the content will be centered in the viewport unless there is not enough space for it. If there is not enough space, it aligns it to the *start*/left edge, rather than keeping it centered and clipping the left edge of the page.
The memoization of the renderPages() method prevents a re-render when something like pageShadows is updated, so displayOptions are added to the dependency array in the memo method.
Prior to fix, the "next page" button in the toolbar wouldn't work well if there were multiple pages in view that were in a single 'row'. This is because the logic is to take the pages that are "visible", take the max of those pages, and then scroll to that page. But the issue is that if the 'max' page is in the same row as other pages, the range of visible pages doesn't change....the max will always be the same.
So the change here basically runs the scroll function twice-- if the first run results in the same 'max' page as before the scroll, it runs it again but with the target page being "max + 1", which will bump the target to the next row.
`frameDidMount` is equivalent to using iframe.addEventListener('load');
Let's not add a new listener and just use the existing event we already have. Functionality still works.
Reduce the visual prominence of the page input by using a darker background and a text color that matches the rest of the toolbar icons. Darker background still indicates this is an interactive item (is an input), hopefully.
Bad commit here with too much stuff. I apologize.
This sets up two Intersection Observers: the first captures every page that is at least 30% visible inside the `.pages` container, and the second captures every page that has at least one pixel on the horizontal center line of `.pages`. Both can be arrays of integers (page index).
The "visiblePages" array is duplicated and formatted into a "formattedPages" state, which gets displayed in the toolbar.
The toolbar displays that, unless the user clicks into the page input and enters their own integer (only a single integer, no range), which can then jump the preview to that page on Enter or blur().
The Arrow 'change page' buttons jump the preview back and forth by a 'full set'.
If one page is viewed at a time, this is moved on page a time, and if 10 pages are viewed at a time it jumps the pages by 10.
Left to do: adapt the "jump editor to match preview" divider button to work with new "centerPage".
