User chose the fade over chasing the WebView slide-teardown reflow. Open now: the cache-
rendered conversation is placed instantly and fades opacity 0->1 over 140ms. No transform,
no off-screen pane, no list-column display toggle -> nothing to reflow at the end, so the
~40ms end-of-slide settle cannot occur. Same afterOpenSlide queue flushes network reconcile/
pins/appends at fade-end. Desktop unaffected (fade is mobile-only via __freshOpen).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>