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

src/components/command.stories.tsx

@@ -59,7 +59,7 @@ function Grouped() {
             환경설정
             <CommandShortcut>⌘,</CommandShortcut>
           </CommandItem>
-          <CommandItem disabled>결제 (사용 불가)</CommandItem>
+          <CommandItem disabled>결제</CommandItem>
         </CommandGroup>
       </CommandList>
     </Command>
@@ -80,7 +80,7 @@ function Long() {
   )
 }
 
-// Same 3-column track as the Form pages (1 column on narrow screens). Each cell is a one-specimen StateBoard so subtitles, dividers and
+// Same 3-column track as the Form pages (1 column on narrow screens). Each cell is a one-specimen StateBoard so subtitles and
 // command boxes line up; sections with fewer specimens leave the remaining tracks empty.
 const Grid = ({ children }: { children: ReactNode }) => (
   <div className="grid items-start gap-6 [grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr))] min-[1000px]:grid-cols-3">{children}</div>