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
