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/sonner.stories.tsx

@@ -2,7 +2,7 @@ import type { ReactNode } from "react"
 import type { Meta, StoryObj } from "@storybook/react-vite"
 import { Button, toast, Toaster } from "@hm-design/ui"
 import { StateBoard } from "./story-board"
-import { STORY_KICKER, StoryPage, StoryPageHeader, StorySection } from "./story-page"
+import { StoryPage, StoryPageHeader, StorySection } from "./story-page"
 
 // Toast is created with the real Sonner API (`toast`, re-exported by @hm-design/ui); nothing is a static specimen.
 // One <Toaster /> is mounted in .storybook/preview.tsx for every Story (an app mounts it once at its root).
@@ -125,14 +125,13 @@ export const All: Story = {
   render: () => (
     <StoryPage>
       <StoryPageHeader
-        kicker={STORY_KICKER.components}
         title="Sonner"
-        description="작업 결과를 잠시 띄우는 Toast 알림입니다. 실제 Sonner API(toast)로 만들며, Toaster는 앱 루트에 한 번 둡니다."
+        description="Toaster는 앱 루트에 한 번"
       />
-      <StorySection title="Variants" description="버튼을 눌러 각 유형의 Toast를 띄웁니다.">
+      <StorySection title="Variants">
         <Board ids={["types"]} />
       </StorySection>
-      <StorySection title="Usage" description="Action / Cancel / Close, Promise, 여러 개 쌓기와 긴 메시지입니다.">
+      <StorySection title="Usage">
         <Board ids={["action", "promise", "stack"]} />
       </StorySection>
     </StoryPage>