UX / Feature suggestion - stay in hunk viewing mode after discard

One thing I've noticed trying out lazygit, it seemed a bit unintuitive when you do `commits -> select some commit with enter -> select some file with enter -> `d` to discard some hunk` it exits hunk editing mode and you always need to reenter it, it feels like exiting hunk mode should be explicit for user in that case.

See the demo below - note that after each discard user needs to reenter hunk viewing mode.

https://github.com/user-attachments/assets/46b4b126-7b15-40eb-864e-2be30d9be6c7

Start by reproducing the commits → file → hunk discard flow shown in the issue and trace how lazygit handles the discard action. The change is done when discarding a hunk keeps the user in hunk viewing mode, while leaving that mode remains an explicit action.

Written by the indexing model from the issue text.