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

internal/builders/conversation_builder.go

@@ -37,6 +37,7 @@ func BuildConversation(item *models.Conversation) response.ConversationResponse
 		AgentLastReadMessageID:    readStateMessageID(agentReadState),
 		AgentLastReadSeqNo:        readStateSeqNo(agentReadState),
 		AgentLastReadAt:           readStateAt(agentReadState),
+		CustomerOnline:            services.WsService.IsVisitorOnline(item.ExternalID),
 		ClosedAt:                  utils.FormatTimePtr(item.ClosedAt),
 		ClosedBy:                  item.ClosedBy,
 		CloseReason:               item.CloseReason,

internal/pkg/dto/response/conversation_response.go

@@ -41,6 +41,7 @@ type ConversationResponse struct {
 	AgentLastReadMessageID    int64                           `json:"agentLastReadMessageId"`
 	AgentLastReadSeqNo        int64                           `json:"agentLastReadSeqNo"`
 	AgentLastReadAt           string                          `json:"agentLastReadAt,omitempty"`
+	CustomerOnline            bool                            `json:"customerOnline"`
 	ClosedAt                  string                          `json:"closedAt,omitempty"`
 	ClosedBy                  int64                           `json:"closedBy"`
 	ClosedByName              string                          `json:"closedByName,omitempty"`

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