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/button.py

@@ -85,7 +85,11 @@ class NvidiaShieldPairAdbButton(ButtonEntity):
             ensure_adb_key, self.hass.config.config_dir
         )
 
-        _LOGGER.info("Attempting ADB pairing with %s:%d — approve the prompt on the Shield", host, port)
+        _LOGGER.info(
+            "Attempting ADB pairing with %s:%d — approve the prompt on the Shield",
+            host,
+            port,
+        )
 
         poller = AdbMediaSessionPoller(host, port, key_path)
         if await poller.connect():