Jesse_ChenandClaude Opus 5.5 da2613ffd9 fix(chat): attach scroll anchor when the scroller appears; only reader scroll releases a pin (BUG-1043, BUG-1044) ...

- The anchor listener and follow observer now attach whenever the scroller
  element itself appears (checked after every commit, no-op unless element,
  active or resetKey changed). The home page mounts `.conversation` after its
  loading screen with unchanged active/resetKey, so a directly opened session
  never got a listener, never landed on its newest content, showed the jump
  chip under short replies and did not follow after pressing it.
- After a pin, geometry no longer releases the hold: only a wheel, touch drag,
  scroll key or scrollbar press followed by a scroll within 1s does. The
  rectification pin rests 94px from the bottom, inside the 96px threshold,
  which dragged long replies to their last line.
- Real React lifecycle tests (loading screen -> reveal, 94px rest), DESIGN,
  BUG history, PROGRESS, CHANGELOG, device checklist and CDP screenshots.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017eEAG8HD3mm8gsKXgk8uU8

2026-09-26 10:42:12 +08:00

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