fix: dashboard updates when switching sites

- Added SiteContext for global site selection state
- Updated admin layout with SiteProvider
- Updated SiteSwitcher to use shared context
- Dashboard now refetches data when site changes

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/web/components/layout/site-switcher.tsx

@@ -4,40 +4,16 @@ import { useState, useEffect, useRef } from 'react';
 import { useSession } from 'next-auth/react';
 import { MapPin, ChevronDown, Check } from 'lucide-react';
 import { cn } from '@/lib/utils';
-
-interface Site {
-  id: string;
-  name: string;
-}
+import { useSite } from '@/contexts/site-context';
 
 export function SiteSwitcher() {
   const { data: session } = useSession();
-  const [sites, setSites] = useState<Site[]>([]);
-  const [selectedSiteId, setSelectedSiteId] = useState<string | null>(null);
+  const { sites, selectedSiteId, selectedSite, setSelectedSiteId, isLoading } = useSite();
   const [isOpen, setIsOpen] = useState(false);
-  const [isLoading, setIsLoading] = useState(true);
   const dropdownRef = useRef<HTMLDivElement>(null);
 
   const isSuperAdmin = session?.user?.role === 'SUPER_ADMIN';
 
-  useEffect(() => {
-    async function fetchSites() {
-      try {
-        const response = await fetch('/api/sites');
-        if (response.ok) {
-          const data = await response.json();
-          setSites(data.data || []);
-        }
-      } catch (error) {
-        console.error('Failed to fetch sites:', error);
-      } finally {
-        setIsLoading(false);
-      }
-    }
-
-    fetchSites();
-  }, []);
-
   useEffect(() => {
     function handleClickOutside(event: MouseEvent) {
       if (dropdownRef.current && !dropdownRef.current.contains(event.target as Node)) {
@@ -49,7 +25,6 @@ export function SiteSwitcher() {
     return () => document.removeEventListener('mousedown', handleClickOutside);
   }, []);
 
-  const selectedSite = sites.find((site) => site.id === selectedSiteId);
   const displayName = selectedSiteId ? selectedSite?.name : 'Todas las sedes';
 
   // For non-SUPER_ADMIN users, just show their assigned site