style(web): 统一后台图标与全局视觉

src/views/operation/NoticeManagementView.vue

@@ -3,7 +3,7 @@
 <script setup>
 import { onMounted, reactive, ref } from 'vue'
 import { ElMessage, ElMessageBox } from 'element-plus'
-import { Plus } from '@element-plus/icons-vue'
+import { AppIcons } from '@/constants/icons'
 import {
   createNoticeApi,
   deleteNoticeApi,
@@ -184,7 +184,7 @@ onMounted(load)
       class="primary-button"
       @click="openCreate"
     >
-      <el-icon><Plus /></el-icon>
+      <AppIcon :icon="AppIcons.add" />
       新建公告
     </el-button>
   </PageHeading>