feat: 完善报销单审批流程及退回原因追踪

新增直属领导审批通过接口和审批待办列表查询，报销单退回
支持原因码分类和审批环节标记，优化票据附件去重和路径
回退查找，前端新增退回原因对话框、审批收件箱和工作台
图标组件，补充工具函数和单元测试覆盖。

web/src/utils/requestViewModel.js

@@ -194,7 +194,13 @@ export function normalizeRequestForUi(request) {
   const sceneTarget = String(request.sceneTarget || request.location || request.city || request.entity || '').trim() || '待补充'
   const occurredDisplay = String(request.occurredDisplay || request.period || request.occurredAt || '').trim() || '待补充'
   const applyTime = String(request.applyTime || parseRequestDateFromId(request.id) || '').trim() || '待补充'
-  const workflowNode = String(request.workflowNode || request.node || '').trim() || '待提交'
+  const workflowNode = String(
+    request.workflowNode
+    || request.node
+    || request.approval_stage
+    || request.approvalStage
+    || ''
+  ).trim() || '待提交'
   const secondaryStatusValue =
     String(request.secondaryStatusValue || request.travel || '').trim()
     || (detailVariant === 'travel' ? '待安排行程' : '待补充票据')