Switching away from the chat view and back left the hook with stale
metrics — keyboardOpen was false at remount even though the system
keyboard was still visible, so the .chat-thread transform never
re-applied and the message list anchored too high. focusin and
synchronous reads also captured offsetTop mid-transition.
Adds a tail of delayed re-reads (50ms, 200ms, 500ms) on focusin,
visibilitychange, and pageshow so iOS has time to settle before the
final snapshot is taken.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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