perf(components): 优化“环境区域”编辑器侧栏样式

src/views/EnvArea/Graphics.vue

@@ -72,7 +72,7 @@ const assetsChange = () => {
     display: flex;
     padding: 8px 16px;
     background-color: #fff;
-    box-shadow: 0px 1px 0px 0px #e4e7ed;
+    border-bottom: 1px solid #e4e7ed;
 
     .t-radio-group.t-radio-group--filled {
       padding: 0px;