fix: [items] 품목 폼 저장/에러 시 하드코딩 경로 → router.back() 전환

src/components/items/DynamicItemForm/index.tsx

@@ -405,8 +405,7 @@ export default function DynamicItemForm({
         }
       }
 
-      router.push('/production/screen-production');
+      router.back();
-      router.refresh();
       });
     } catch (error) {
       // 2025-12-11: 백엔드에서 중복 에러 반환 시 다이얼로그 표시

src/components/items/ItemDetailEdit.tsx

@@ -350,7 +350,7 @@ export function ItemDetailEdit({ itemCode, itemType: urlItemType, itemId: urlIte
       <div className="flex flex-col items-center justify-center py-12 gap-4">
         <p className="text-destructive">{error}</p>
         <button
-          onClick={() => router.push('/production/screen-production')}
+          onClick={() => router.back()}
           className="text-primary hover:underline"
         >
           품목 목록으로 돌아가기
@@ -365,7 +365,7 @@ export function ItemDetailEdit({ itemCode, itemType: urlItemType, itemId: urlIte
       <div className="flex flex-col items-center justify-center py-12 gap-4">
         <p className="text-muted-foreground">품목 정보를 불러올 수 없습니다.</p>
         <button
-          onClick={() => router.push('/production/screen-production')}
+          onClick={() => router.back()}
           className="text-primary hover:underline"
         >
           품목 목록으로 돌아가기

src/components/items/ItemForm/index.tsx

@@ -175,8 +175,7 @@ export default function ItemForm({ mode, initialData, onSubmit }: ItemFormProps)
         certificationFileName: certificationFile?.name,
       };
       await onSubmit(finalData);
-      router.push('/production/screen-production');
+      router.back();
-      router.refresh();
     } catch {
       toast.error('품목 저장에 실패했습니다.');
     } finally {