style(storybook): refine patterns data and layout stories

src/patterns/loading-screen.stories.tsx

@@ -33,12 +33,12 @@ export const All: Story = {
   render: () => (
     <StoryPage>
       <StoryPageHeader title="Loading Screen" />
-      <StorySection title="Overview">
-        <LoadingScreen />
-      </StorySection>
       <StorySection title="Variants">
+        {/* Default spans the full width; the other two share an equal 2-column row (1 column below 2 × 560px). */}
         <StateBoard
+          min={560}
           states={[
+            { id: "default", label: "Default", wide: true, children: <LoadingScreen /> },
             { id: "label", label: "Custom label", children: <LoadingScreen>데이터를 불러오는 중</LoadingScreen> },
             { id: "narrow", label: "Narrow parent (240px)", children: <div style={{ width: 240 }}><LoadingScreen /></div> },
           ]}