DialogCurrentTypingDto

{
    "sender": {
        "id": "550e8400-e29b-41d4-a716-446655440000",
        "type": "lead",
        "first_name": "Иван",
        "last_name": "Петров",
        "username": "ivan_petrov",
        "avatar_url": "https://example.com/avatar.jpg"
    },
    "platform": "web",
    "started_at": "2026-01-28T10:00:00.000Z",
    "streaming": true
}