feat(P20T1-4): 差旅前端入口与审批移动端联动

client/src/pages/MobileApprovalsPage.tsx

@@ -29,6 +29,9 @@ function entityLabel(entityType: string | undefined) {
   if (entityType === "purchase_request") {
     return "采购";
   }
+  if (entityType === "travel_request") {
+    return "差旅";
+  }
   return entityType || "未知";
 }
 
@@ -189,6 +192,14 @@ export function MobileApprovalsPage() {
                   <div>金额：{selectedTask.purchaseRequest.totalAmount ?? "-"}</div>
                 </>
               ) : null}
+              {selectedTask.travelRequest ? (
+                <>
+                  <div>差旅单号：{selectedTask.travelRequest.requestNo ?? selectedTask.travelRequest.id}</div>
+                  <div>申请人：{selectedTask.travelRequest.applicant?.name ?? "-"}</div>
+                  <div>出差类型：{selectedTask.travelRequest.tripType === "international" ? "国际" : "国内"}</div>
+                  <div>预估金额：{selectedTask.travelRequest.estimatedAmount ?? "-"}</div>
+                </>
+              ) : null}
             </div>
 
             <Textarea