fix(WEB): 생산지시 생성 에러 표시 및 Loader2 import 수정

- 생산지시 생성 실패 시 에러 메시지가 UI에 표시되지 않던 문제 수정
- WorkOrderDetail.tsx에서 Loader2 import 누락 수정

src/app/[locale]/(protected)/sales/order-management-sales/[id]/production-order/page.tsx

@@ -530,6 +530,17 @@ export default function ProductionOrderCreatePage() {
         }
       />
 
+      {/* 에러 메시지 표시 */}
+      {error && order && (
+        <div className="mb-4 p-4 bg-red-50 border border-red-200 rounded-lg flex items-start gap-3">
+          <AlertCircle className="h-5 w-5 text-red-500 flex-shrink-0 mt-0.5" />
+          <div>
+            <p className="text-sm font-medium text-red-800">생산지시 생성 실패</p>
+            <p className="text-sm text-red-600 mt-1">{error}</p>
+          </div>
+        </div>
+      )}
+
       <div className="space-y-6">
         {/* 수주 정보 */}
         <Card>

src/components/production/WorkOrders/WorkOrderDetail.tsx

@@ -7,7 +7,7 @@
 
 import { useState, useEffect, useCallback } from 'react';
 import { useRouter } from 'next/navigation';
-import { FileText, List, AlertTriangle, Play, CheckCircle2 } from 'lucide-react';
+import { FileText, List, AlertTriangle, Play, CheckCircle2, Loader2 } from 'lucide-react';
 import { ContentLoadingSpinner } from '@/components/ui/loading-spinner';
 import { Button } from '@/components/ui/button';
 import { Badge } from '@/components/ui/badge';