humanspeak / svelte-virtual-chat / 27770732167

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fix(chat): preserve scroll progress through late growth (#30)

* fix(chat): preserve scroll progress through late growth

- Track directional scroll intent during wheel and keyboard input
- Preserve scroll progress while rendered content mutates after paint
- Add wheel scroll jump repro coverage for remount and persisted growth

* refactor(chat): dedup scroll-progress restore and viewport reads

- Reuse captureViewportGeometry() in isAtViewportBottom() instead of
  re-reading scrollTop/scrollHeight/clientHeight inline
- Collapse the repeated "restore progress then sync follow" block at
  three call sites into restoreProgressAndSyncFollow(), passing the
  adjusted geometry through to avoid a second DOM read
- Capture performance.now() once per scroll/rAF pass and reuse it
- Simplify matchesDirection to a single movedInDirection() helper

Behavior-preserving cleanup; unit tests and e2e (chromium/firefox)
remain green.

* test(chat): skip wheel-only spec on mobile safari

* test(chat): cover touch scroll jump path

* test(chat): harden scroll jump coverage

180 of 198 branches covered (90.91%)

Branch coverage included in aggregate %.

103 of 105 new or added lines in 2 files covered. (98.1%)

336 of 340 relevant lines covered (98.82%)

51.72 hits per line