fix(m9/T24b): try/finally around _busy in move dialog (circuit-teardown lock)

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

@@ -88,8 +88,9 @@
 
         _busy = true;
         _error = null;
+        try
+        {
             var result = await MoveService.MoveAsync(ConnectionId, target);
-        _busy = false;
 
             if (result.Success)
             {
@@ -102,4 +103,9 @@
                 _error = result.Error ?? "Move failed.";
             }
         }
+        finally
+        {
+            _busy = false;
+        }
+    }
 }