[
  {
    "id": "1",
    "title": "Broadcast messages",
    "participants": [
      {
        "name": "Toufik Alam",
        "role": "Admin",
        "avatar": "https://i.pravatar.cc/150?img=12"
      },
      {
        "name": "Toufik Alam",
        "role": "Academic head",
        "avatar": "https://i.pravatar.cc/150?img=12"
      }
    ],
    "messages": [
      {
        "id": 1,
        "sender": "Toufik Alam",
        "role": "Admin",
        "timestamp": "2025-10-02 10:38 AM",
        "text": "Hi!"
      },
      {
        "id": 2,
        "sender": "Toufik Alam",
        "role": "Admin",
        "timestamp": "2025-10-02 10:38 AM",
        "text": "This is a test broadcast message"
      },
      {
        "id": 3,
        "sender": "Toufik Alam",
        "role": "Admin",
        "timestamp": "2025-10-02 10:38 AM",
        "text": "Hi!"
      },
      {
        "id": 4,
        "sender": "Toufik Alam",
        "role": "Admin",
        "timestamp": "2025-10-02 10:38 AM",
        "attachment": {
          "name": "Celisal ic particles.pdf",
          "type": "pdf",
          "url": "https://example.com/files/celisalic-particles.pdf"
        }
      },
      {
        "id": 5,
        "sender": "Toufik Alam",
        "role": "Admin",
        "timestamp": "2025-10-02 10:38 AM",
        "text": "This is a test broadcast message"
      },
      {
        "id": 6,
        "sender": "Toufik Alam",
        "role": "Academic head",
        "timestamp": "2025-10-02 10:38 AM",
        "text": "Hi!"
      },
      {
        "id": 7,
        "sender": "Toufik Alam",
        "role": "Academic head",
        "timestamp": "2025-10-02 10:38 AM",
        "attachment": {
          "name": "Celisal ic particles.pdf",
          "type": "pdf",
          "url": "https://example.com/files/celisalic-particles.pdf"
        }
      },
      {
        "id": 8,
        "sender": "Toufik Alam",
        "role": "Academic head",
        "timestamp": "2025-10-02 10:38 AM",
        "text": "This is a test broadcast message"
      }
    ]
  }
]