When the interaction zone grows/shrinks (composer ↔ permission prompt /
AskUserQuestion, D-78) the conversation viewport changed height but the scroll
offset didn't follow, leaving the last card hidden behind the taller box. Track
whether the view is pinned to the tail; a LayoutBuilder around the list detects
the viewport-height change and re-jumps to the bottom only when pinned, so a
scrolled-up reader is undisturbed.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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