feat(ui): make dashboard responsive for iPhone and mobile devices

- Add Sheet primitive component for mobile drawers
- Add MobileNav with hamburger menu for dashboard layout
- Hide desktop sidebars on mobile; show mobile header
- Make dashboard header responsive with stacked layout on small screens
- Hide selector text on mobile, show icons only
- Convert fixed-width filters to responsive widths (CFDI, Clientes, Admin, Documentos, Alertas)
- Cap dialog widths to 95vw on mobile (CFDI viewer, Documentos, Reportes, Contribuyentes, Facturación)
- Make calendar grid smaller and use single-letter weekdays on mobile
- Update viewport to include viewport-fit=cover for Samsung safe areas

apps/web/components/cfdi/cfdi-viewer-modal.tsx

@@ -192,7 +192,7 @@ export function CfdiViewerModal({ cfdi, open, onClose }: CfdiViewerModalProps) {
 
   return (
     <Dialog open={open} onOpenChange={(isOpen) => !isOpen && onClose()}>
-      <DialogContent className="max-w-4xl max-h-[90vh] overflow-y-auto">
+      <DialogContent className="max-w-[95vw] md:max-w-4xl max-h-[90vh] overflow-y-auto">
         <DialogHeader>
           <div className="flex items-center justify-between">
             <DialogTitle>Vista de Factura</DialogTitle>