feat(admin): add event attendees export (CSV) with status filters

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

frontend/src/app/admin/events/[id]/page.tsx

@@ -1,10 +1,10 @@
 'use client';
 
-import { useState, useEffect } from 'react';
+import { useState, useEffect, useRef, useCallback } from 'react';
 import { useParams, useRouter } from 'next/navigation';
 import Link from 'next/link';
 import { useLanguage } from '@/context/LanguageContext';
-import { eventsApi, ticketsApi, emailsApi, paymentOptionsApi, Event, Ticket, EmailTemplate, PaymentOptionsConfig } from '@/lib/api';
+import { eventsApi, ticketsApi, emailsApi, paymentOptionsApi, adminApi, Event, Ticket, EmailTemplate, PaymentOptionsConfig } from '@/lib/api';
 import Card from '@/components/ui/Card';
 import Button from '@/components/ui/Button';
 import {
@@ -34,6 +34,8 @@ import {
   BoltIcon,
   BuildingLibraryIcon,
   ArrowPathIcon,
+  ArrowDownTrayIcon,
+  ChevronDownIcon,
 } from '@heroicons/react/24/outline';
 import toast from 'react-hot-toast';
 import clsx from 'clsx';
@@ -85,6 +87,23 @@ export default function AdminEventDetailPage() {
   });
   const [submitting, setSubmitting] = useState(false);
   
+  // Export state
+  const [showExportDropdown, setShowExportDropdown] = useState(false);
+  const [exporting, setExporting] = useState(false);
+  const exportBtnRef = useRef<HTMLButtonElement>(null);
+  const [exportDropdownPos, setExportDropdownPos] = useState({ top: 0, right: 0 });
+
+  const toggleExportDropdown = useCallback(() => {
+    if (!showExportDropdown && exportBtnRef.current) {
+      const rect = exportBtnRef.current.getBoundingClientRect();
+      setExportDropdownPos({
+        top: rect.bottom + 4,
+        right: window.innerWidth - rect.right,
+      });
+    }
+    setShowExportDropdown((v) => !v);
+  }, [showExportDropdown]);
+  
   // Tickets tab state
   const [ticketSearchQuery, setTicketSearchQuery] = useState('');
   const [ticketStatusFilter, setTicketStatusFilter] = useState<'all' | 'confirmed' | 'checked_in'>('all');
@@ -341,6 +360,28 @@ export default function AdminEventDetailPage() {
     }
   };
 
+  const handleExport = async (status: 'confirmed' | 'checked_in' | 'confirmed_pending' | 'all') => {
+    if (!event) return;
+    setExporting(true);
+    setShowExportDropdown(false);
+    try {
+      const { blob, filename } = await adminApi.exportAttendees(event.id, { status, format: 'csv' });
+      const url = URL.createObjectURL(blob);
+      const a = document.createElement('a');
+      a.href = url;
+      a.download = filename;
+      document.body.appendChild(a);
+      a.click();
+      document.body.removeChild(a);
+      URL.revokeObjectURL(url);
+      toast.success('Export downloaded');
+    } catch (error: any) {
+      toast.error(error.message || 'Failed to export attendees');
+    } finally {
+      setExporting(false);
+    }
+  };
+
   // Filtered tickets for attendees tab
   const filteredTickets = tickets.filter((ticket) => {
     // Status filter
@@ -710,6 +751,21 @@ export default function AdminEventDetailPage() {
               </div>
               {/* Action Buttons */}
               <div className="flex items-center gap-2">
+                {/* Export Button */}
+                <Button
+                  ref={exportBtnRef}
+                  variant="outline"
+                  onClick={toggleExportDropdown}
+                  disabled={exporting}
+                >
+                  {exporting ? (
+                    <div className="w-4 h-4 mr-2 border-2 border-gray-400 border-t-transparent rounded-full animate-spin" />
+                  ) : (
+                    <ArrowDownTrayIcon className="w-4 h-4 mr-2" />
+                  )}
+                  Export
+                  <ChevronDownIcon className="w-3 h-3 ml-1" />
+                </Button>
                 <Button variant="outline" onClick={() => setShowManualTicketModal(true)}>
                   <EnvelopeIcon className="w-4 h-4 mr-2" />
                   Manual Ticket
@@ -988,6 +1044,49 @@ export default function AdminEventDetailPage() {
         </div>
       )}
 
+      {/* Export Dropdown (rendered outside Card to avoid overflow:hidden clipping) */}
+      {showExportDropdown && (
+        <>
+          <div
+            className="fixed inset-0 z-40"
+            onClick={() => setShowExportDropdown(false)}
+          />
+          <div
+            className="fixed w-48 bg-white border border-secondary-light-gray rounded-btn shadow-lg z-50"
+            style={{ top: exportDropdownPos.top, right: exportDropdownPos.right }}
+          >
+            <button
+              onClick={() => handleExport('confirmed')}
+              className="w-full text-left px-4 py-2 text-sm hover:bg-gray-50 rounded-t-btn"
+            >
+              Export Confirmed
+            </button>
+            <button
+              onClick={() => handleExport('checked_in')}
+              className="w-full text-left px-4 py-2 text-sm hover:bg-gray-50"
+            >
+              Export Checked-in
+            </button>
+            <button
+              onClick={() => handleExport('confirmed_pending')}
+              className="w-full text-left px-4 py-2 text-sm hover:bg-gray-50"
+            >
+              Export Confirmed &amp; Pending
+            </button>
+            <button
+              onClick={() => handleExport('all')}
+              className="w-full text-left px-4 py-2 text-sm hover:bg-gray-50"
+            >
+              Export All
+            </button>
+            <div className="border-t border-secondary-light-gray" />
+            <div className="px-4 py-2 text-xs text-gray-400 rounded-b-btn">
+              Format: CSV
+            </div>
+          </div>
+        </>
+      )}
+
       {/* Add at Door Modal */}
       {showAddAtDoorModal && (
         <div