fix: persist execute switch state across HA restarts

SmartThingsExecuteSwitch used `_assumed_on = True` in __init__,
so beep and display_lighting always showed ON after HA restart
even when they were turned OFF before. ARTIK051 doesn't report
OCF execute state, so `_get_ocf_options()` returns None.

Fix: Use `_attr_assumed_on` as a class-level default and
restore the last known state from HA's state registry in
`async_added_to_hass()` via `async_get_last_state()`. If no
previous state exists, defaults to ON (beep is enabled by default
on Samsung ACs).

Author: blka

custom_components/smartthings/manifest.json

@@ -10,5 +10,5 @@
   "codeowners": ["@blka"],
   "iot_class": "cloud_push",
   "loggers": ["pysmartthings"],
-  "version": "1.1.0"
+  "version": "1.1.1"
 }

custom_components/smartthings/switch.py

@@ -645,6 +645,7 @@ class SmartThingsExecuteSwitch(SmartThingsEntity, SwitchEntity):
     """Define a SmartThings OCF execute switch for Samsung AC devices."""
 
     entity_description: SmartThingsExecuteSwitchEntityDescription
+    _attr_assumed_on: bool = True
 
     def __init__(
         self,
@@ -658,7 +659,14 @@ def __init__(
         self._attr_unique_id = (
             f"{device.device.device_id}_{MAIN}_execute_{entity_description.key}"
         )
-        self._assumed_on = True
+
+    async def async_added_to_hass(self) -> None:
+        """Restore last known state after HA restart."""
+        await super().async_added_to_hass()
+        last_state = await self.async_get_last_state()
+        if last_state is not None:
+            self._attr_assumed_on = last_state.state == "on"
+            self.async_write_ha_state()
 
     def _get_ocf_options(self) -> list[str] | None:
         """Extract OCF options list from execute capability data attribute."""
@@ -699,7 +707,7 @@ def is_on(self) -> bool:
         options = self._get_ocf_options()
         if options is not None:
             return self.entity_description.off_option not in options
-        return self._assumed_on
+        return self._attr_assumed_on
 
     async def async_turn_on(self, **kwargs: Any) -> None:
         """Turn the switch on."""
@@ -708,7 +716,7 @@ async def async_turn_on(self, **kwargs: Any) -> None:
             Command.EXECUTE,
             [OCF_MODE_HREF, {OCF_OPTIONS_KEY: [self.entity_description.on_option]}],
         )
-        self._assumed_on = True
+        self._attr_assumed_on = True
         self.async_write_ha_state()
 
     async def async_turn_off(self, **kwargs: Any) -> None:
@@ -718,5 +726,5 @@ async def async_turn_off(self, **kwargs: Any) -> None:
             Command.EXECUTE,
             [OCF_MODE_HREF, {OCF_OPTIONS_KEY: [self.entity_description.off_option]}],
         )
-        self._assumed_on = False
+        self._attr_assumed_on = False
         self.async_write_ha_state()