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/radio-group.stories.tsx

@@ -1,7 +1,7 @@
 import type { Meta, StoryObj } from "@storybook/react-vite"
 import { Label, RadioGroup, RadioGroupItem } 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"
 
 // Current HM Radio Group. ui-viz has no Radio spec, so it was reference only.
 
@@ -54,9 +54,8 @@ export const All: Story = {
   render: () => (
     <StoryPage>
       <StoryPageHeader
-        kicker={STORY_KICKER.components}
         title="Radio Group"
-        description="여러 선택지 중 하나를 고르는 컨트롤입니다. 그룹 안에서는 방향키로 이동·선택합니다(Radix roving focus)."
+        description="그룹 안에서 방향키로 이동·선택"
       />
       <StorySection title="Overview">
         <StateBoard min={240} states={[{ id: "vertical", label: "Vertical (default) · Checked / Unchecked", children: <Group prefix="v" defaultValue="b" /> }]} />
@@ -75,7 +74,7 @@ export const All: Story = {
           ]}
         />
       </StorySection>
-      <StorySection title="Validation" description="aria-invalid로 Error 테두리를 표시합니다.">
+      <StorySection title="Validation" description="aria-invalid → Error 테두리">
         <StateBoard min={240} states={[{ id: "error", label: "Error", children: <Group prefix="e" invalid /> }]} />
       </StorySection>
     </StoryPage>