fix: DataTables and Chart.js loading issues

- Fixed DataTables order column index (was 6, table has 6 columns 0-5)
- Changed order to [[3, 'desc']] for date column
- Removed invalid chart.min.css link (Chart.js 4.x has no separate CSS)
- Changed loadDashboardData call to window.loadDashboardData

public/admin.html

@@ -14,7 +14,6 @@
     <!-- Google Fonts -->
     <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap" rel="stylesheet">
     <!-- Chart.js -->
-    <link href="https://cdn.jsdelivr.net/npm/chart.js@4.4.1/dist/chart.min.css" rel="stylesheet">
     <!-- DataTables -->
     <link href="https://cdn.jsdelivr.net/npm/datatables.net-bs5@1.13.8/css/dataTables.bootstrap5.min.css" rel="stylesheet">
     <!-- Lightpick -->
@@ -2792,7 +2791,7 @@ Ver todos
             },
             pageLength: 10,
             ordering: true,
-            order: [[6, 'desc']]
+            order: [[3, 'desc']]  // Sort by date column (0-indexed)
         });
 
         // ============ CHARTS ============
@@ -3233,14 +3232,14 @@ Ver todos
                  userRoleEl.textContent = roleNames[user.role] || user.role;
              }
              
-             // Initialize admin panel
+              // Initialize admin panel
               if (window.admin) {
                   window.admin.init();
               }
               
               // Load dashboard data after auth check
-              if (typeof loadDashboardData === 'function') {
-                  loadDashboardData();
+              if (typeof window.loadDashboardData === 'function') {
+                  window.loadDashboardData();
               }
           } catch (error) {
               console.error('Auth check failed:', error);