fix: stabilize webtoon segment preload scrolling#698
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Keep the scroll anchor stable while webtoon content reloads around end-of-chapter preloading. Unify anchor capture and restoration across deferred reloads and measured layout updates, and keep valid height cache entries when segment content changes.
everpcpc
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Summary
Why
Webtoon occasionally jumped by a small distance after reaching the last pages of a chapter. The issue was caused by content reload and layout correction paths restoring an older scroll position after the reader had already advanced slightly, which made the viewport snap backward after scrolling finished.
Impact
Validation
make formatmake build