fix: make ADB poll failures visible and stop stale-state cling; cancel tracked poll tasks on unload (B2, B5-prep); lint cleanups across daemon modules

custom_components/nvidia_shield/config_flow.py

@@ -3,10 +3,10 @@
 import logging
 
 import voluptuous as vol
-
 from homeassistant import config_entries
 from homeassistant.core import callback
-from homeassistant.helpers import entity_registry as er, selector
+from homeassistant.helpers import entity_registry as er
+from homeassistant.helpers import selector
 
 from .adb_session import AdbMediaSessionPoller, ensure_adb_key
 from .const import (