Remove volume_up/volume_down overrides from ws66i media player

Set _attr_volume_step to 1/MAX_VOL (1/38) and let the base class
handle volume stepping. The base class calls async_set_volume_level
which delegates to _set_volume, preserving the automatic unmute
behavior when volume changes.

https://claude.ai/code/session_01Gn8AeZ8HvyyDw53e1rynUA

homeassistant/components/ws66i/media_player.py

@@ -55,6 +55,7 @@ class Ws66iZone(CoordinatorEntity[Ws66iDataUpdateCoordinator], MediaPlayerEntity
         | MediaPlayerEntityFeature.TURN_OFF
         | MediaPlayerEntityFeature.SELECT_SOURCE
     )
+    _attr_volume_step = 1 / MAX_VOL
 
     def __init__(
         self,
@@ -147,20 +148,6 @@ class Ws66iZone(CoordinatorEntity[Ws66iDataUpdateCoordinator], MediaPlayerEntity
         await self.hass.async_add_executor_job(self._set_volume, int(volume * MAX_VOL))
         self._async_update_attrs_write_ha_state()
 
-    async def async_volume_up(self) -> None:
-        """Volume up the media player."""
-        await self.hass.async_add_executor_job(
-            self._set_volume, min(self._status.volume + 1, MAX_VOL)
-        )
-        self._async_update_attrs_write_ha_state()
-
-    async def async_volume_down(self) -> None:
-        """Volume down media player."""
-        await self.hass.async_add_executor_job(
-            self._set_volume, max(self._status.volume - 1, 0)
-        )
-        self._async_update_attrs_write_ha_state()
-
     def _set_volume(self, volume: int) -> None:
         """Set the volume of the media player."""
         # Can't set a new volume level when this zone is muted.