Chromium scrolls overflow:hidden ancestors when a textarea caret moves out of view (PageUp/PageDown in the prompt box, long prompts), shifting the whole app up and hiding the title bar with no way to scroll back. Snap html/body/#root back to zero on any root scroll event in the web, desktop, VS Code and mini-chat apps. Claude-Session: https://claude.ai/code/session_017TK5JAYDfT3Fotc23UEg98