feat(66): Stack 컴포넌트에 Stack 내보내기 추가 및 export 수정

Author: Seojunhwan

src/components/ui/Stack/Stack.tsx

@@ -26,7 +26,7 @@ export type StackProps<T extends ElementType> =
  * </Stack>
  * ```
  */
-const Stack = <T extends ElementType = "div">({
+export const Stack = <T extends ElementType = "div">({
   as,
   className,
   direction,

src/components/ui/Stack/index.ts

@@ -1 +1 @@
-export { HStack, type StackProps, VStack } from "./Stack";
+export { HStack, Stack, type StackProps, VStack } from "./Stack";