App shell
Copied Academia school chrome: SchoolSwitcher + SchoolSidebar (flat nav, Help, Back, user) + Header + InfoSidebar. Demo nav labels are placeholders — hosts pass their own items. Fonts load via host font.config (Academia copy).
Sidebar: Academia SchoolSidebar (structure copied; nav data below is mock). Right drawer: Help or Ctrl/⌘+I. User menu: avatar at the bottom.