重构 Wave3 详情与移动体验（05-28-frontend-ux-wave3-business-mobile）

client/src/pages/MobilePurchaseRequestDetailPage.tsx

@@ -54,6 +54,11 @@ export function MobilePurchaseRequestDetailPage() {
 
   const detail = detailQuery.data ?? null;
   const displayCode = detail ? resolvePurchaseDisplayCode(detail) : "采购详情";
+  const nextStepText = detail
+    ? detail.pendingWorkflow?.task?.stepName
+      ? `当前在 ${detail.pendingWorkflow.task.stepName}，可从审批详情处理；本页用于核对采购依据。`
+      : resolvePurchaseStatusHint(detail)
+    : "";
 
   return (
     <PageScaffold className="space-y-3 pb-4">
@@ -77,7 +82,7 @@ export function MobilePurchaseRequestDetailPage() {
 
       {detail ? (
         <>
-          <section className="mobile-card" data-testid="mobile-purchase-detail-summary">
+          <section className="mobile-card mobile-focus-card mobile-page-stack" data-testid="mobile-purchase-detail-summary">
             <div className="flex items-start justify-between gap-3">
               <div className="min-w-0">
                 <h2 className="truncate text-base font-semibold text-zinc-900">{displayCode}</h2>
@@ -96,9 +101,14 @@ export function MobilePurchaseRequestDetailPage() {
                 <div className="text-xs text-zinc-500">申请人</div>
                 <div className="mt-1 truncate font-medium text-zinc-900">{detail.applicant?.name ?? "-"}</div>
               </div>
+              <div>
+                <div className="text-xs text-zinc-500">当前节点</div>
+                <div className="mt-1 truncate font-medium text-zinc-900">{detail.pendingWorkflow?.task?.stepName ?? "-"}</div>
+              </div>
             </div>
-            <div className="mt-3 rounded-lg bg-zinc-50 px-3 py-2 text-xs leading-5 text-zinc-600">
-              {resolvePurchaseStatusHint(detail)}
+            <div className="mobile-subcard bg-white text-sm">
+              <div className="text-xs font-semibold text-zinc-500">下一步</div>
+              <div className="mt-1 leading-6 text-zinc-700">{nextStepText}</div>
             </div>
           </section>