feat: [stocks] 재고 관리 페이지 신규 + 회계 모듈 타입/코드 정리

- 재고 관리 페이지 및 컴포넌트 신규 추가
- 회계 6개 모듈 중복 타입 제거, 코드 간소화 (-212줄)
- AccountSubjectSelect 마이너 수정
- Popover 외부 클릭 다이얼로그 이슈 가이드 문서

src/app/[locale]/(protected)/sales/stocks/[id]/page.tsx

@@ -0,0 +1,75 @@
+'use client';
+
+/**
+ * 재고생산 상세/수정 페이지
+ *
+ * - 기본: 상세 보기 (StockProductionDetail)
+ * - ?mode=edit: 수정 (StockProductionForm)
+ */
+
+import { useState, useEffect } from 'react';
+import { useParams, useSearchParams } from 'next/navigation';
+import { Loader2 } from 'lucide-react';
+import { toast } from 'sonner';
+import { StockProductionDetail } from '@/components/stocks/StockProductionDetail';
+import { StockProductionForm } from '@/components/stocks/StockProductionForm';
+import { getStockOrderById, type StockOrder } from '@/components/stocks/actions';
+
+function EditStockContent({ id }: { id: string }) {
+  const [order, setOrder] = useState<StockOrder | null>(null);
+  const [loading, setLoading] = useState(true);
+
+  useEffect(() => {
+    async function load() {
+      try {
+        const result = await getStockOrderById(id);
+        if (result.__authError) {
+          toast.error('인증이 만료되었습니다.');
+          return;
+        }
+        if (result.success && result.data) {
+          setOrder(result.data);
+        } else {
+          toast.error(result.error || '데이터를 불러오는데 실패했습니다.');
+        }
+      } finally {
+        setLoading(false);
+      }
+    }
+    load();
+  }, [id]);
+
+  if (loading) {
+    return (
+      <div className="flex items-center justify-center min-h-[400px]">
+        <div className="flex flex-col items-center gap-4">
+          <Loader2 className="h-8 w-8 animate-spin text-blue-600" />
+          <p className="text-muted-foreground">데이터를 불러오는 중...</p>
+        </div>
+      </div>
+    );
+  }
+
+  if (!order) {
+    return (
+      <div className="flex items-center justify-center min-h-[400px]">
+        <p className="text-muted-foreground">데이터를 찾을 수 없습니다.</p>
+      </div>
+    );
+  }
+
+  return <StockProductionForm initialData={order} isEditMode />;
+}
+
+export default function StockDetailPage() {
+  const params = useParams();
+  const searchParams = useSearchParams();
+  const id = params.id as string;
+  const mode = searchParams.get('mode');
+
+  if (mode === 'edit') {
+    return <EditStockContent id={id} />;
+  }
+
+  return <StockProductionDetail orderId={id} />;
+}

src/app/[locale]/(protected)/sales/stocks/page.tsx

@@ -0,0 +1,27 @@
+'use client';
+
+/**
+ * 재고생산관리 페이지
+ *
+ * - 기본: 목록 (StockProductionList)
+ * - ?mode=new: 등록 (StockProductionForm)
+ */
+
+import { useSearchParams } from 'next/navigation';
+import { StockProductionList } from '@/components/stocks/StockProductionList';
+import { StockProductionForm } from '@/components/stocks/StockProductionForm';
+
+function CreateStockContent() {
+  return <StockProductionForm />;
+}
+
+export default function StocksPage() {
+  const searchParams = useSearchParams();
+  const mode = searchParams.get('mode');
+
+  if (mode === 'new') {
+    return <CreateStockContent />;
+  }
+
+  return <StockProductionList />;
+}