chore: add stories for Stack (#12375)

site/src/components/Stack/Stack.stories.tsx

@@ -0,0 +1,47 @@
+import type { Meta, StoryObj } from "@storybook/react";
+import { Stack } from "./Stack";
+
+const meta: Meta<typeof Stack> = {
+  title: "components/Stack",
+  component: Stack,
+  args: {
+    children: (
+      <>
+        <span>チェンソーマン</span>
+        <span>ジョジョの奇妙な冒険</span>
+        <span>スパイファミリー</span>
+        <span>葬送のフリーレン</span>
+        <span>少女革命ウテナ</span>
+        <span>PSYCHO-PASS サイコパス</span>
+        <span>機動戦士ガンダム 水星の魔女</span>
+        <span>勇気爆発バーンブレイバーン</span>
+        <span>Re:ゼロから始める異世界生活</span>
+        <span>ダンジョン飯</span>
+      </>
+    ),
+  },
+};
+
+export default meta;
+type Story = StoryObj<typeof Stack>;
+
+export const Vertical: Story = {};
+
+export const VerticalCenter: Story = {
+  args: {
+    alignItems: "center",
+  },
+};
+
+export const Horizontal: Story = {
+  args: {
+    direction: "row",
+  },
+};
+
+export const HorizontalWrap: Story = {
+  args: {
+    direction: "row",
+    wrap: "wrap",
+  },
+};