fix: [자재투입] 검색결과 key 중복 경고 수정

src/components/production/WorkerScreen/MaterialInputModal.tsx

@@ -794,8 +794,8 @@ export function MaterialInputModal({
                         {searchResults.length > 0 ? (
                           <div className="space-y-1">
                             <p className="text-[11px] text-blue-600 font-medium">{searchResults.length}건 검색됨:</p>
-                            {searchResults.map((s) => (
-                              <div key={s.itemId} className={cn(
+                            {searchResults.map((s, si) => (
+                              <div key={`${s.itemId}-${si}`} className={cn(
                                 "text-[11px] px-2 py-1.5 rounded border",
                                 s.availableQty > 0 ? "bg-white border-emerald-200" : "bg-gray-50 border-gray-200"
                               )}>