style(storybook): group overlay, disclosure and navigation story pages

- Sheet + Drawer, Tooltip + Hover Card, Accordion + Collapsible,
  Dialog + Alert Dialog, Dropdown Menu + Context Menu on one page each
  (specimens moved to *-examples.tsx; absorbed Stories keep their IDs)
- Popover, Tabs content spacing, Breadcrumb, Menubar and Command tidied
- Component docs updated to the new representative pages

docs/components/breadcrumb.md

@@ -69,7 +69,7 @@ Component Mapping 위치: `packages/ui/src/theme/breadcrumb.css` (`--hm-breadcru
 
 ## 9. Storybook
 
-- 대표 Story `All`("Breadcrumb"): Variants(Basic(3 depth), Ellipsis(Dropdown Menu 조합), Custom link(asChild)와 custom separator)를 PC 균등 3열로, Usage(Long path, 최대 900px)를 한 페이지에 둔다(2026-11-09 Overview 제거).
+- 대표 Story `All`("Breadcrumb"): Variants(Basic(3 depth), Ellipsis(Dropdown Menu 조합), Custom(asChild link와 custom separator))를 iframe 1000px 이상 균등 3열·미만 1열로, Usage(Long path, 섹션 전체 너비, 좁으면 자연 줄바꿈)를 한 페이지에 둔다(2026-11-09 Overview 제거, 2026-11-13 Custom 명칭·1/3열·900px 제한 제거).
 - verification: `Basic`, `Ellipsis`, `Long Path`.
 
 ## 10. 사용자 확정 결정