style(storybook): refine overlay story layout

src/components/hover-card.stories.tsx

@@ -1,5 +1,6 @@
 import type { Meta, StoryObj } from "@storybook/react-vite"
 import { HoverCard, HoverCardContent, HoverCardTrigger } from "@hm-design/ui"
+import { StateBoard, type BoardState } from "@/components/story-board"
 import { StoryPage, StoryPageHeader, StorySection } from "@/components/story-page"
 
 // Hover Card is a Radix overlay (Portal) for a richer preview than Tooltip. The representative Story shows real triggers
@@ -48,17 +49,34 @@ const meta = { title: "Components/Overlay/Hover Card", component: HoverCard, par
 export default meta
 type Story = StoryObj<typeof meta>
 
+// Representative-page layout (Storybook presentation only): equal columns on PC (iframe width 1000px and up), fewer below that
+// (200px minimum). Each specimen sits in its own single-column StateBoard (min larger than any column), so every subtitle and divider
+// has the width of its column; a section with fewer specimens than columns leaves the remaining columns empty. The trigger keeps its
+// own size (the wrapper div stretches, the inline-flex trigger does not). Overlays open in a portal, so this layout never affects them.
+function SpecimenGrid({ states, columns = 4 }: { states: BoardState[]; columns?: 4 | 5 }) {
+  return (
+    <div className={`grid items-start gap-6 [grid-template-columns:repeat(auto-fill,minmax(min(100%,200px),1fr))] ${columns === 5 ? "min-[1000px]:grid-cols-5" : "min-[1000px]:grid-cols-4"}`}>
+      {states.map((state) => (
+        <StateBoard key={state.id} min={10000} states={[{ ...state, children: <div>{state.children}</div> }]} />
+      ))}
+    </div>
+  )
+}
+
+// Representative Story: Overview and Usage are merged into one Variants section (Basic, Long Content).
 export const All: Story = {
   name: "Hover Card",
   parameters: { layout: "fullscreen", controls: { disable: true } },
   render: () => (
     <StoryPage>
       <StoryPageHeader title="Hover Card" />
-      <StorySection title="Overview">
-        <Preview />
-      </StorySection>
-      <StorySection title="Usage">
-        <LongContent />
+      <StorySection title="Variants">
+        <SpecimenGrid
+          states={[
+            { id: "basic", label: "Basic", children: <Preview /> },
+            { id: "long-content", label: "Long Content", children: <LongContent /> },
+          ]}
+        />
       </StorySection>
     </StoryPage>
   ),