perf: 优化站内信布局；显示站内信关闭按钮

src/components/Table/TableFormatters/LabelsFormatter.vue

@@ -1,7 +1,7 @@
 <template>
   <div class="label-container">
     <a class="label-formatter-col">
-      <span v-if="!iLabels || iLabels.length === 0">
+      <span v-if="!iLabels || iLabels.length === 0" style="vertical-align: top;">
         <el-tag effect="plain" size="mini">
           <i class="fa fa-tag" /> -
         </el-tag>

src/layout/components/NavHeader/SiteMessages.vue

@@ -203,7 +203,7 @@ export default {
 
 <style lang="scss" scoped>
 .drawer {
-  height: calc(100% - 40px);
+  height: calc(100% - 0px);
 }
 
 .el-badge ::v-deep .el-badge__content.is-fixed {

src/layout/components/NavHeader/index.vue

@@ -180,6 +180,10 @@ export default {
           font-size: 16px;
         }
 
+        & > > > i.el-dialog__close.el-icon-close {
+          color: #7c7e7f;
+        }
+
         & > > > .svg-icon {
           color: #FFF;
           font-size: 16px;