style(接口自动化): 统一步骤样式

frontend/src/business/components/api/automation/scenario/EditApiScenario.vue

@@ -521,8 +521,9 @@
             this.$refs.apiImport.open();
             break;
         }
-
-        this.selectedNode.expanded = true;
+        if (this.selectedNode) {
+          this.selectedNode.expanded = true;
+        }
         this.sort();
       },
       nodeClick(data, node) {

frontend/src/business/components/api/automation/scenario/LoopController.vue

@@ -5,8 +5,8 @@
     @remove="remove"
     :data="controller"
     :draggable="true"
-    color="#015478"
-    background-color="#E6EEF2"
+    color="#02A7F0"
+    background-color="#F4F4F5"
     :title="$t('api_test.automation.loop_controller')">
 
     <template v-slot:headerLeft>
@@ -16,7 +16,6 @@
       <el-radio @change="changeRadio" class="ms-radio" v-model="controller.loopType" label="WHILE">{{$t('loop.while')}}</el-radio>
     </template>
 
-
     <div v-if="controller.loopType==='LOOP_COUNT'" draggable>
       <el-row>
         <el-col :span="8">