feat(WEB): 절곡 자재투입 LOT 매핑 프론트엔드 연동

- actions.ts: MaterialForInput에 workOrderItemId/lotPrefix/partType/category 필드 추가
- MaterialInputModal: dynamic_bom 세부품목 단위 그룹핑 + category 배지 표시
- 작업일지 4개 섹션 lotNoMap prop 추가 (GuideRail/BottomBar/ShutterBox/SmokeBarrier)
- WorkLogModal: materialLots에서 BD-* 필터링 → lotNoMap 빌드 후 전달
- utils.ts: lengthToCode() 래퍼 함수 추가

src/components/production/WorkerScreen/WorkLogModal.tsx

@@ -209,8 +209,15 @@ export function WorkLogModal({
         return <ScreenWorkLogContent data={order} materialLots={materialLots} />;
       case 'slat':
         return <SlatWorkLogContent data={order} materialLots={materialLots} />;
-      case 'bending':
-        return <BendingWorkLogContent data={order} />;
+      case 'bending': {
+        const lotNoMap: Record<string, string> = {};
+        for (const lot of materialLots) {
+          if (lot.item_code.startsWith('BD-')) {
+            lotNoMap[lot.item_code] = lot.lot_no;
+          }
+        }
+        return <BendingWorkLogContent data={order} lotNoMap={lotNoMap} />;
+      }
       default:
         return <WorkLogContent data={order} />;
     }