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/manager.js

@@ -31,6 +31,9 @@ document.head.appendChild(toolbarStyle)
 addons.setConfig({
   layout: {
     showPanel: false,
+    // LNB width 246px. recentVisibleSizes keeps the same width when the sidebar is collapsed and expanded again.
+    navSize: 246,
+    recentVisibleSizes: { navSize: 246 },
   },
   theme: create({
     base: 'light',