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tallImg was no-img, so the balloon is a TEXT bubble stretching (even in a 17-msg chat). Add: composer/ textarea height+scrollHeight+rows+value+fontSize+lineHeight (why ~4 lines), whether chat-opening class + .content animationName are applied (why transition jumps), and the tall bubble's text + tallest child. Build marker -> 2026-07-18-batch116. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>