feat: [공정관리] 품목 선택 모달에 전체 선택 체크박스 추가

src/components/process-management/RuleModal.tsx

@@ -307,7 +307,28 @@ export function RuleModal({ open, onOpenChange, onAdd, editRule, processId, proc
             <Table>
               <TableHeader>
                 <TableRow className="bg-muted/50">
-                  <TableHead className="w-[40px]"></TableHead>
+                  <TableHead className="w-[40px]">
+                    {itemList.length > 0 && (
+                      <Checkbox
+                        checked={
+                          itemList.filter((item) => !isItemDisabled(item)).length > 0 &&
+                          itemList.filter((item) => !isItemDisabled(item)).every((item) => selectedItemIds.has(item.id))
+                        }
+                        onCheckedChange={(checked) => {
+                          setSelectedItemIds((prev) => {
+                            const newSet = new Set(prev);
+                            const selectableItems = itemList.filter((item) => !isItemDisabled(item));
+                            if (checked) {
+                              selectableItems.forEach((item) => newSet.add(item.id));
+                            } else {
+                              selectableItems.forEach((item) => newSet.delete(item.id));
+                            }
+                            return newSet;
+                          });
+                        }}
+                      />
+                    )}
+                  </TableHead>
                   <TableHead className="w-[80px]">품목유형</TableHead>
                   <TableHead>품목코드</TableHead>
                   <TableHead>품목명</TableHead>