feat(hrm): 添加流程抄送标记已读未读功能

- 扩展操作列宽度从100到150以适应新功能
- 添加标记未读链接在已读状态下显示
- 实现handleUnread方法用于取消已读状态
- 优化表格操作按钮布局结构

ruoyi-ui/src/views/hrm/flow/cc.vue

@@ -37,11 +37,14 @@
             {{ parseTime(scope.row.createTime) }}
           </template>
         </el-table-column>
-        <el-table-column label="操作" width="100" fixed="right">
+        <el-table-column label="操作" width="150" fixed="right">
           <template #default="scope">
             <el-link v-if="activeTab === 'unread'" type="primary" @click.stop="handleRead(scope.row)">
               标记已读
             </el-link>
+            <el-link v-if="activeTab === 'read'" type="warning" @click.stop="handleUnread(scope.row)">
+              标记未读
+            </el-link>
             <el-link type="primary" @click.stop="goDetail(scope.row)">
               详情
             </el-link>