feat(storybook): add shared SW notice and refine SW previews

- Add StoryNotice and a withSWNotice decorator so every visible SW Story
  shows the common notice above its title; non-SW Stories are unaffected.
- Align the SW Header overview with the common SW Story page layout, let the
  preview Stage fill the available width and keep inner scroll on narrow screens.
- Rename SW/Footer to SW/하단 명령어바 (sidebar title only, Story IDs fixed via
  id: "sw-footer"), drop the top SWHeader from its preview and lower the
  workspace height bounds by the removed 49px.

src/sw/sw-header-home-menu.stories.tsx

@@ -1,5 +1,6 @@
 import { useLayoutEffect, useRef, useState, type ReactNode } from "react"
 import type { Meta, StoryObj } from "@storybook/react-vite"
+import { withSWNotice } from "./sw-story-notice"
 // Public API only, like a consuming project.
 import {
   SWHeader, SWHeaderPropertyBar, SWHomeMenu, SWHomeMenuItem, SWHomeMenuSection, SWPopup, SWPopupRow, SWPopupSection,
@@ -25,6 +26,7 @@ const KICKER = "HM DESIGN SYSTEM / SW"
 const meta = {
   title: "SW/Header",
   parameters: { layout: "fullscreen", controls: { disable: true } },
+  decorators: [withSWNotice],
 } satisfies Meta
 export default meta
 type Story = StoryObj<typeof meta>