style(storybook): localize 조직도 and 노선도 menus, Department Colors 3 columns

- OrgChart -> 조직도 and sub menus (개요, 부서별 색상, 전체 구성, 확장 조직도); Story IDs kept
- 노선도 menu/page titles in Korean (제목, 정보, 노선·공간, 시설물)
- Department Colors cards 3 columns (2 under 960px)

src/org-chart/department-colors-preview.css

@@ -1,7 +1,7 @@
 /* Department Colors Storybook adapter only. The actual Tunnel sample/stage
    frame comes from center-stories.css; this sheet never selects employee cards. */
 .hm-orgchart-department-preview .hm-orgchart-department-colors-design {
-  grid-template-columns: repeat(2, minmax(0, 1fr));
+  grid-template-columns: repeat(3, minmax(0, 1fr));
   gap: var(--sb-center-column-gap);
 }
 
@@ -43,6 +43,12 @@
   background: transparent;
 }
 
+@media (max-width: 960px) {
+  .hm-orgchart-department-preview .hm-orgchart-department-colors-design {
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+  }
+}
+
 @media (max-width: 760px) {
   .hm-orgchart-department-preview .hm-orgchart-department-colors-design {
     grid-template-columns: minmax(0, 1fr);