sendMessage(): void {
  if (this.isConnected) {
    this.agentService.chatWs(this.conversationId, message);
  } else {
    this.agentService.chat(this.conversationId, message).subscribe({
      next: (response) => {
        this.messages.push({ role: 'assistant', content: response.message });
      }
    });
  }
}