feat: add Excel export, keyboard shortcuts, and print view for CFDIs

- Add export to Excel button with xlsx library for filtered data
- Add keyboard shortcuts (Esc to close popovers/forms)
- Add print button to invoice viewer modal with optimized print styles

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

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

@@ -6,7 +6,7 @@ import { Dialog, DialogContent, DialogHeader, DialogTitle } from '@/components/u
 import { Button } from '@/components/ui/button';
 import { CfdiInvoice } from './cfdi-invoice';
 import { getCfdiXml } from '@/lib/api/cfdi';
-import { Download, FileText, Loader2 } from 'lucide-react';
+import { Download, FileText, Loader2, Printer } from 'lucide-react';
 
 interface CfdiConcepto {
   descripcion: string;
@@ -120,6 +120,45 @@ export function CfdiViewerModal({ cfdi, open, onClose }: CfdiViewerModalProps) {
     }
   };
 
+  const handlePrint = () => {
+    if (!invoiceRef.current) return;
+
+    // Create a print-specific stylesheet
+    const printStyles = document.createElement('style');
+    printStyles.innerHTML = `
+      @media print {
+        body * {
+          visibility: hidden;
+        }
+        #cfdi-print-area, #cfdi-print-area * {
+          visibility: visible;
+        }
+        #cfdi-print-area {
+          position: absolute;
+          left: 0;
+          top: 0;
+          width: 100%;
+          padding: 20px;
+        }
+        @page {
+          size: A4;
+          margin: 15mm;
+        }
+      }
+    `;
+    document.head.appendChild(printStyles);
+
+    // Add ID to the invoice container for print targeting
+    invoiceRef.current.id = 'cfdi-print-area';
+
+    // Trigger print
+    window.print();
+
+    // Clean up
+    document.head.removeChild(printStyles);
+    invoiceRef.current.removeAttribute('id');
+  };
+
   if (!cfdi) return null;
 
   return (
@@ -156,6 +195,16 @@ export function CfdiViewerModal({ cfdi, open, onClose }: CfdiViewerModalProps) {
                 )}
                 XML
               </Button>
+              <Button
+                variant="outline"
+                size="sm"
+                onClick={handlePrint}
+                disabled={downloading !== null}
+                title="Imprimir factura"
+              >
+                <Printer className="h-4 w-4 mr-1" />
+                Imprimir
+              </Button>
             </div>
           </div>
         </DialogHeader>