settings: add destroyed check in async callbacks

src/settings/setting/base.py

@@ -172,6 +172,8 @@ class BaseSetting:
                 return SearcherFactory.create(self.search_target).search()
 
             def _on_success(result):
+                if self._destroyed:
+                    return
                 self.map = result
                 self._normalize_map()
                 self._map_ready = True
@@ -182,15 +184,21 @@ class BaseSetting:
                 return self._get_backend_range_sync()
 
             def _on_success(result):
+                if self._destroyed:
+                    return
                 self.map = self._build_map_from_range(result)
                 self._normalize_map()
                 self._map_ready = True
                 self._notify_map_updated()
 
         def _on_error(exc):
+            if self._destroyed:
+                return
             self.logger.error(f"Map load failed for {self.name}: {exc}")
 
         def _on_done():
+            if self._destroyed:
+                return
             self._map_loading = False
             self._set_busy(False)
 
@@ -218,13 +226,19 @@ class BaseSetting:
             return self._get_backend_value_sync()
 
         def _on_success(value):
+            if self._destroyed:
+                return
             self._current_value = value
             self._update_widget()
 
         def _on_error(exc):
+            if self._destroyed:
+                return
             self.logger.error(f"Value load failed for {self.name}: {exc}")
 
         def _on_done():
+            if self._destroyed:
+                return
             self._value_loading = False
             self._set_busy(False)
 
@@ -244,9 +258,13 @@ class BaseSetting:
             return self._set_backend_value_sync(value)
 
         def _on_error(exc):
+            if self._destroyed:
+                return
             self.logger.error(f"Value save failed for {self.name}: {exc}")
 
         def _on_done():
+            if self._destroyed:
+                return
             self._set_busy(False)
 
         self._executor.submit(_save, on_error=_on_error, on_done=_on_done)