The radio group is not focusable

[fahmyiqbal]

This issue is a:

• bug report
• feature request
• styling change request

Current behavior:

The radio group cannot be focused when it is accessed using the tab key at https://susunjadwal.cs.ui.ac.id/susun and https://susunjadwal.cs.ui.ac.id/edit/...

Requested behavior:

The radio group must be accessible using either the tab key or the arrow keys.

Why this behavior is better:

It is crucial for web accessibility.