Add Zona de marca brandbooks and strategist calendar generation.

Per-tenant brandbooks power ads, RRSS calendars, LinkedIn B2B and blog; Nov calendars now create from trends + client DNA instead of copying history.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/components/DashboardShell.tsx

@@ -21,6 +21,7 @@ import {
   Menu,
   X,
   Leaf,
+  BookMarked,
 } from 'lucide-react';
 import TenantSwitcher from '@/components/TenantSwitcher';
 import type { DashboardModuleId } from '@/lib/tenant-modules';
@@ -65,6 +66,13 @@ const NAV_ITEMS: NavItem[] = [
     iconClass: 'text-emerald-500',
     moduleId: 'estrategia',
   },
+  {
+    href: '/dashboard/marca',
+    label: 'Zona de marca',
+    icon: BookMarked,
+    iconClass: 'text-rose-500',
+    moduleId: 'marca',
+  },
   {
     href: '/dashboard/ad-tracker',
     label: 'Ads',