Fix initial state of UV protection window (#146408)

The `binary_sensor` is created when the config entry is loaded after the
`async_config_entry_first_refresh` has completed (during the forward of
setup to platforms). Therefore, the update coordinator will already have
data and will not trigger the invocation of
`_handle_coordinator_update`.

Fixing this just means performing the same update at initialization.

homeassistant/components/openuv/binary_sensor.py

@@ -49,6 +49,10 @@ class OpenUvBinarySensor(OpenUvEntity, BinarySensorEntity):
     @callback
     def _handle_coordinator_update(self) -> None:
         """Update the entity from the latest data."""
+        self._update_attrs()
+        super()._handle_coordinator_update()
+
+    def _update_attrs(self) -> None:
         data = self.coordinator.data
 
         for key in ("from_time", "to_time", "from_uv", "to_uv"):
@@ -78,5 +82,3 @@ class OpenUvBinarySensor(OpenUvEntity, BinarySensorEntity):
                     ATTR_PROTECTION_WINDOW_STARTING_TIME: as_local(from_dt),
                 }
             )
-
-        super()._handle_coordinator_update()

homeassistant/components/openuv/entity.py

@@ -31,3 +31,8 @@ class OpenUvEntity(CoordinatorEntity):
             name="OpenUV",
             entry_type=DeviceEntryType.SERVICE,
         )
+
+        self._update_attrs()
+
+    def _update_attrs(self) -> None:
+        """Override point for updating attributes during init."""