docs(storybook): simplify sidebar Story pages around the UI

Drop the category kicker from the 83 sidebar Stories (kicker is now optional;
hidden verification Stories keep it) and shorten or remove repeated, obvious
or internal page/section descriptions. Required specs, limits, virtual-data
and undecided-value notices stay. Story IDs, exports, fixtures, shared state
notes and package code are unchanged. Record: docs/reports/storybook-ui-simplification-2026-10-22.md

src/components/collapsible.stories.tsx

@@ -3,7 +3,7 @@ import type { Meta, StoryObj } from "@storybook/react-vite"
 import { ChevronDownIcon } from "lucide-react"
 import { Button, Collapsible, CollapsibleContent, CollapsibleTrigger } from "@hm-design/ui"
 import { StateBoard } from "@/components/story-board"
-import { STORY_KICKER, StoryPage, StoryPageHeader, StorySection } from "@/components/story-page"
+import { StoryPage, StoryPageHeader, StorySection } from "@/components/story-page"
 
 // The representative "Collapsible" Story shows one independent disclosure per state with real, clickable triggers. The same
 // sections also exist as Stories tagged `verification` (hidden from the sidebar). Collapsible is a single disclosure: no divider
@@ -81,13 +81,12 @@ export const All: Story = {
   render: () => (
     <StoryPage>
       <StoryPageHeader
-        kicker={STORY_KICKER.components}
         title="Collapsible"
-        description="하나의 영역을 펼치고 접는 단일 disclosure입니다. 구분선 체계와 애니메이션은 없습니다."
+        description="구분선·애니메이션 없음"
       />
       <StorySection title="Overview">{board("closed")}</StorySection>
       <StorySection title="States">{board("open", "disabled")}</StorySection>
-      <StorySection title="Usage" description="긴 콘텐츠와, Button을 trigger로 쓰는 제어형 조합입니다.">{board("long", "controlled")}</StorySection>
+      <StorySection title="Usage">{board("long", "controlled")}</StorySection>
     </StoryPage>
   ),
 }