Should we allow focusing on random "empty" cells?

[luongvo]

Following https://github.com/composeuisuite/ohteepee/issues/8, I agree it's a feature that allows the user to edit the wrong input ✅

https://github.com/user-attachments/assets/ce295b52-ef2a-43c6-a292-0430baba29c0

However, I don't think we should allow this behavior on "empty" cells. Saying the input is empty, the user can skip a char, such as 1_23. This is a weird behavior so I at least want to have a flag to disable this case ❌

https://github.com/user-attachments/assets/ba1d7e18-f014-4df8-a311-8a317ec1f4d3