feat(storybook): refine Manager LNB, HM Color and Patterns/Layout/LNB

- Manager LNB: 246px width, 16px brand title, 14px/700 menu and section
  titles, depth1 48px / depth2+ 42px rows, 24px section gap
- Foundation: rename Color to HM Color (Story ID foundation-color--all kept),
  remove Company Colors subtitle and the page-title bottom border
- Patterns/Layout/LNB: Storybook-only overrides in lnb.stories.css
  (240px column, 212px min width, 14px menu, 48/42px rows, profile text,
  group dividers); representative board dividers per section
- Sync story inventory and docs (brand-color-steps, lnb); shared package
  defaults and tokens are unchanged

.storybook/qa/STORY-INVENTORY.md

@@ -499,11 +499,11 @@ Source: `src/components/tooltip.stories.tsx`; meta.tags: []
 - All — Tooltip; tags: []; PRIMARY; KEEP. Representative story or distinct reference page.
 - Open — Open; tags: ["verification"]; VERIFICATION; HIDE. Keep direct URL and tag-filter access; excluded from default sidebar.
 
-### Foundation/Color
+### Foundation/HM Color
 
 Source: `src/foundation/color.stories.tsx`; meta.tags: []
 
-- All — Color; tags: []; PRIMARY; KEEP. Representative story or distinct reference page.
+- All — HM Color; tags: []; PRIMARY; KEEP. Representative story or distinct reference page.
 
 ### Foundation/Company Colors