8c7f4e8008
The state callback in main_headless.py wrote events to stdout synchronously, so an EINVAL on the Tauri sidecar pipe (Windows) bubbled up through _set_state and tore down engine init and reload_engine. That turned PUT /api/config into a "Failed to fetch" for the user. The print is now pipe-safe and api_server isolates the chained callback so a future misbehaving listener cannot break the engine state machine. Settings also now persists remote.email on login and shows a "Logged in as <email>" indicator with a Log out button when an auth_token is present, instead of leaving the email/password fields blank on reload. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>