Restore scroll position within an article on Next/Previous

Next/Previous replaces this screen's own back-stack entry with a fresh one
for the neighboring article, which recreates the WebView from scratch --
going back to an article you'd been partway through always landed you back
at the top. Tracks each article's scroll offset in an in-memory,
process-lifetime map (ReaderScrollPositions) as the WebView scrolls, and
restores it once the freshly-loaded page finishes laying out.

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