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/center/center-spatial.stories.tsx

@@ -1,7 +1,7 @@
 import type { Meta, StoryObj } from "@storybook/react-vite"
 import { RouteLine } from "@hm-design/center-graphic"
 import { CenterSpatialInformationReferenceDemo } from "@hm-design/center-graphic/reference"
-import { STORY_KICKER, StoryPage, StoryPageHeader, StorySection } from "@/components/story-page"
+import { StoryPage, StoryPageHeader, StorySection } from "@/components/story-page"
 import { CENTER_BOUNDARY, withRepresentation } from "./center-shared"
 
 // Owners: ui-viz docs/visualization/route.md, spatial-map.md, spatial-section.md, composition.md.
@@ -20,9 +20,8 @@ export const Spatial: Story = {
   render: () => (
     <StoryPage className="sb-center-spatial-page">
       <StoryPageHeader
-        kicker={STORY_KICKER.center}
         title="Spatial"
-        description="CENTER 노선·공간 정보 Reference입니다. 노선 레이어 순서(Shadow → Outline → Primary Stroke)는 확정이며, 전체 지도 레이어 순서는 Candidate, line join은 TBD입니다."
+        description="노선 레이어 순서 확정 · 전체 지도 레이어 순서 Candidate · line join TBD"
       />
       <StorySection title="Overview" description={CENTER_BOUNDARY}>
         {withRepresentation(() => <CenterSpatialInformationReferenceDemo />)}