feat: add customer online status to conversation response and update UI accordingly

internal/services/ws_connection_manager.go

@@ -104,6 +104,14 @@ func (m *WsConnectionManager) FindByTopics(topics []string) []*ClientSession {
 	return ret
 }
 
+func (m *WsConnectionManager) HasTopic(topic string) bool {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+
+	sessions := m.topics[topic]
+	return len(sessions) > 0
+}
+
 func (m *WsConnectionManager) subscribeLocked(session *ClientSession, topic string) {
 	if _, exists := session.Topics[topic]; exists {
 		return

internal/services/ws_service.go

@@ -386,6 +386,14 @@ func (s *wsService) PublishToTopics(topics []string, event RealtimeEvent) {
 	}
 }
 
+func (s *wsService) IsVisitorOnline(visitorID string) bool {
+	visitorID = strings.TrimSpace(visitorID)
+	if visitorID == "" {
+		return false
+	}
+	return s.manager.HasTopic(s.visitorTopic(visitorID))
+}
+
 func (s *wsService) routeConversationTopics(conversation *models.Conversation) []string {
 	if conversation == nil {
 		return nil