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874b30d97d
When WiFi disconnects while a roaming scan is in progress, the SCANNING state was transitioning to IDLE in retry_connect(). When the device then reconnected, check_connecting_finished() treated the IDLE state as a normal connection and reset roaming_attempts_ to 0. This caused the roaming counter to perpetually restart at 1/3 instead of progressing to 2/3, 3/3, creating an infinite loop of roaming scans every 5 minutes. This is most likely to occur on ESP8266 where disconnect callbacks run immediately in SDK system context (setting error_from_callback_ before the main loop can process scan results), compared to ESP32 IDF where events are queued and the scan-done event is typically processed before the disconnect. Fix by transitioning to RECONNECTING instead of IDLE when a disconnect occurs during SCANNING. This preserves the attempts counter on successful reconnection, allowing the device to reach the 3-attempt limit and stop scanning.
