Feat: Add a loop variable to the loop operator. #10427 (#11423)

### What problem does this PR solve?

Feat: Add a loop variable to the loop operator. #10427

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/agent/canvas/index.less

@@ -8,4 +8,7 @@
     border: 0;
     background-color: transparent;
   }
+  :global(.react-flow__node-group.selectable.selected) {
+    box-shadow: none;
+  }
 }