style(agent): 优化工作流页面样式

- 移除工作流卡片标题的自定义颜色样式- 优化 Markdown 渲染容器的样式，确保图片自适应- 调整历史记录项弹出框的样式，使其背景透明无圆角

src/views/agent/work-flow/index.vue

@@ -41,8 +41,9 @@
               <div class="text ellipsis-title" @click="getHistoryInfo(item)">
                 {{ item.title }}
               </div>
-              <a-trigger position="bottom" :auto-fit-position="true" :unmount-on-close="true">
-                <SvgIcon size="12" name="svg-more"  style="float: right" />
+              <div class="trigger-container">
+                <a-trigger position="top" trigger="click" :auto-fit-position="false" :unmount-on-close="true ">
+                  <SvgIcon size="12" name="svg-more"  class="icon-more"  />
                   <template #content>
                     <div class="">
                       <div class="history-item-dropdown">
@@ -70,6 +71,7 @@
             </div>
           </div>
         </div>
+      </div>
       <div class="right-wap">
         <div class="header">
           <div class="body">

src/views/agent/work-flow/style.scss

@@ -225,8 +225,19 @@
             text-overflow: ellipsis;
             cursor: pointer;
           }
+          .trigger-container {
+            position: relative;
+            .icon-more {
+              display: none;
+              float: right;
+              cursor: pointer;
+            }
+          }
           &:hover {
             background: var(--BG-200, #E6E6E8);
+            .trigger-container .icon-more {
+              display: block;
+            }
           }
 
         }