Chat stays centered while the workspace card fits beside it with 32px to spare. When it does not fit, chat moves left only as far as needed, narrows only after it reaches the left padding, and the card becomes a popover below a 640px chat. The card is lighter: 280px wide, 32px rows, no section labels, no "Project folder" hint.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>