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41fdf48ad3
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".