The TOC occasionally flashed a scroll to the current item and then
snapped back to the top, and on slow mobile first-opens sometimes
stayed at the top entirely.
Root cause: `useOverlayScrollbars({ defer: true })` schedules OS
construction via `requestIdleCallback` with a ~2233 ms timeout. On a
busy first open the timeout fires before the browser goes idle, so OS
wraps the viewport late — and the wrap step resets the scroller's
`scrollTop` synchronously, undoing Virtuoso's earlier scroll to the
current item. Virtuoso's `rangeChanged` / `onScroll` don't propagate
the reset for another frame, so any guard based on tracked scroll
state reads stale.
* feat: Add option to split words in RSVP mode
* fix(rsvp): replace lookbehind regex with lookahead-only split in getHyphenParts
* feat: Add option to split words in RSVP mode
* fix(theme): update data-theme and themeCode when system theme changes
* feat(rsvp): split on ellipsis between letters and preserve delimiter type
* fix(rsvp): fix incorrect merged line
* feat(rsvp): insert blank frame between consecutive identical words
* refactor(sidebar): replace react-window and OverlayScrollbars with react-virtuoso and CSS scrollbars
* feat(toc): smooth scroll to active chapter on sidebar open
* test(theme-store): expand dark theme palette fixture with full color tokens
* refactor: remove dead code and consolidate duplicate CSS scrollbar rules
* fix(toc): fix auto-scroll on sidebar open and improve scroll behavior
- Add isSideBarVisible to scroll effect deps so it fires on sidebar open
- Use setTimeout delay for Virtuoso to finish layout before scrolling
- Add 10s cooldown on user scroll to re-enable auto-scroll
- Use smooth scroll for short distances (<16 items), instant for longer
- Track visible center via rangeChanged for accurate distance calculation
- Fix tab navigation background opacity (bg-base-200 instead of /20)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---------
Co-authored-by: Huang Xin <chrox.huang@gmail.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Huang Xin