Switch account no longer signs out up front — it just opens the sign-in panel, and the worker retires the old session once the replacement sign-in completes. Abandoning the switch leaves the session as it was. The header Sign in button now appears alongside the account chip while the panel is open, so the form keeps its one submit button, and a profile refresh landing mid-switch no longer closes the panel. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>