feat(button,media_player): Pair ADB carries entity_category CONFIG (t30 G11) + BrowseMediaSource domain parameter at root and children (t30 G18, 2026-05-20 blog contract); stubs/tests pin both

custom_components/nvidia_shield/button.py

@@ -5,7 +5,7 @@ import logging
 from homeassistant.components.button import ButtonEntity
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.core import HomeAssistant
-from homeassistant.helpers.entity import DeviceInfo
+from homeassistant.helpers.entity import DeviceInfo, EntityCategory
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 
 from .adb_session import AdbMediaSessionPoller, ensure_adb_key
@@ -36,6 +36,7 @@ class NvidiaShieldPairAdbButton(ButtonEntity):
 
     _attr_has_entity_name = True
     _attr_name = "Pair ADB"
+    _attr_entity_category = EntityCategory.CONFIG
     _attr_icon = "mdi:link-variant"
 
     def __init__(self, hass: HomeAssistant, entry: ConfigEntry) -> None: