style(项目管理): 消息管理UI样式优化

--bug=1035836 --user=吕梦园
https://www.tapd.cn/55049933/bugtrace/bugs/view/1155049933001035836
--bug=1035831 --user=吕梦园
https://www.tapd.cn/55049933/bugtrace/bugs/view/1155049933001035831
--bug=1035805 --user=吕梦园
https://www.tapd.cn/55049933/bugtrace/bugs/view/1155049933001035805
--bug=1035802 --user=吕梦园
https://www.tapd.cn/55049933/bugtrace/bugs/view/1155049933001035802

frontend/src/views/project-management/messageManagement/components/messageList.vue

@@ -445,6 +445,11 @@
 </script>
 
 <style lang="less" scoped>
+  :deep(.arco-table-cell-expand-icon) {
+    .arco-table-cell-inline-icon {
+      margin-right: 8px;
+    }
+  }
   :deep(.gray-td-bg) {
     td {
       background-color: var(--color-text-n9);

frontend/src/views/project-management/messageManagement/components/messagePreview.vue

@@ -21,7 +21,7 @@
         <a-avatar>MS</a-avatar>
         <div class="flex flex-1 flex-col overflow-hidden">
           <div class="font-medium text-[var(--color-text-1)]" v-html="subject || '-'"></div>
-          <div class="mt-[4px] flex-1 text-[var(--color-text-2)]" v-html="template || '-'"></div>
+          <div class="my-[4px] flex-1 text-[var(--color-text-2)]" v-html="template || '-'"></div>
           <div class="text-[var(--color-text-4)]">{{ dayjs().format('YYYY-MM-DD HH:mm:ss') }}</div>
         </div>
       </div>

frontend/src/views/project-management/messageManagement/components/robotList.vue

@@ -569,6 +569,7 @@
   .robot-list-container {
     @apply relative;
 
+    border-radius: var(--border-radius-small);
     background-color: var(--color-text-n9);
     .ms-container--shadow-y();
     .robot-list {

frontend/src/views/project-management/messageManagement/edit.vue

@@ -59,8 +59,8 @@
           <div class="font-medium text-[var(--color-text-1)]">
             {{ t('project.messageManagement.messageTemplate') }}
           </div>
-          <div class="flex whitespace-nowrap text-[rgb(var(--warning-6))]">
-            <icon-exclamation-circle class="mr-[4px] mt-[2px] text-[rgb(var(--warning-6))]" />
+          <div class="ml-[8px] flex items-center whitespace-nowrap text-[rgb(var(--warning-6))]">
+            <icon-exclamation-circle class="mr-[4px] text-[rgb(var(--warning-6))]" />
             {{
               currentLocale === 'zh-CN'
                 ? '引用消息变量格式为：${变量名称}'