fix(centralui): safe-invoke fire-and-forget calls in AlarmSummary and TreeView (review 2026-10-21 07/M-4)

src/ZB.MOM.WW.ScadaBridge.CentralUI/Components/Shared/TreeView.razor

@@ -207,7 +207,7 @@ else
         // Clear selection if the selected key no longer exists in the current items tree
         if (Selectable && SelectedKey != null && _items is not null && !KeyExistsInTree(_items, SelectedKey))
         {
-            _ = SelectedKeyChanged.InvokeAsync(null);
+            _ = SafeFireAndForgetAsync(() => SelectedKeyChanged.InvokeAsync(null));
         }
     }
 
@@ -553,10 +553,22 @@ else
         if (StorageKey != null)
         {
             var json = System.Text.Json.JsonSerializer.Serialize(_expandedKeys.ToList());
-            _ = JSRuntime.InvokeVoidAsync("treeviewStorage.save", StorageKey, json);
+            _ = SafeFireAndForgetAsync(() =>
+                JSRuntime.InvokeVoidAsync("treeviewStorage.save", StorageKey, json).AsTask());
         }
     }
 
+    // Fire-and-forget calls (an EventCallback, a JS persist) can race circuit teardown;
+    // swallow the expected disposal/disconnect failures so no unobserved-task exception
+    // reaches the log (review 2026-10-21 07/M-4).
+    private static async Task SafeFireAndForgetAsync(Func<Task> work)
+    {
+        try { await work(); }
+        catch (ObjectDisposedException) { }
+        catch (JSDisconnectedException) { }
+        catch (TaskCanceledException) { }
+    }
+
     private async Task OnContentClick(object key)
     {
         // Clicking a node makes it the tab entry point (roving tabindex follows the