Fix sidebar alert badge not clearing on acknowledge (fixes #186)

Dashboard/Controls/AlertsHistoryContent.xaml.cs

@@ -23,6 +23,8 @@ namespace PerformanceMonitorDashboard.Controls
 {
     public partial class AlertsHistoryContent : UserControl
     {
+        public event EventHandler? AlertsDismissed;
+
         private List<AlertHistoryDisplayItem> _allAlerts = new();
 
         /* Column filter state */
@@ -219,6 +221,7 @@ private void DismissSelected_Click(object sender, RoutedEventArgs e)
 
             service.HideAlerts(keys);
             LoadAlerts();
+            AlertsDismissed?.Invoke(this, EventArgs.Empty);
         }
 
         private void DismissAll_Click(object sender, RoutedEventArgs e)
@@ -247,6 +250,7 @@ private void DismissAll_Click(object sender, RoutedEventArgs e)
 
             service.HideAllAlerts(hoursBack > 0 ? hoursBack : 8760, serverName);
             LoadAlerts();
+            AlertsDismissed?.Invoke(this, EventArgs.Empty);
         }
 
         #endregion

Dashboard/MainWindow.xaml.cs

@@ -606,6 +606,7 @@ private void OpenAlertsTab()
             }
 
             _alertsHistoryContent = new AlertsHistoryContent();
+            _alertsHistoryContent.AlertsDismissed += (_, _) => UpdateAlertBadge();
 
             var headerPanel = new StackPanel { Orientation = Orientation.Horizontal };
             var headerText = new TextBlock
@@ -1568,6 +1569,15 @@ private void AcknowledgeServerAlerts_Click(object sender, RoutedEventArgs e)
                 {
                     serverTab.UpdateBadges(null, _alertStateService);
                 }
+
+                // Hide alerts in the email alert log so the sidebar badge updates
+                var server = _serverManager.GetAllServers().FirstOrDefault(s => s.Id == serverId);
+                if (server != null)
+                {
+                    _emailAlertService.HideAllAlerts(8760, server.DisplayName);
+                    UpdateAlertBadge();
+                    _alertsHistoryContent?.RefreshAlerts();
+                }
             }
         }