front: stdcm: move the computation modal box so that it doesn't hide simulation n°3 & 4

[axrolld]

Description

The computation modal box is hiding simulation tab 3 & 4. It would be nice to set them free 🕊

AC

Mockup required on the expected behavior.

[thibautsailly]

Could we just add some space above the simulations navigation? It will be necessary to display the computation result later anyway:

[thibautsailly]

The mockup initially provided more space to correctly display the computation message and the simulations navigation, but I agree it isn't easy to spot:

I'll probably have to reorganise the Sketch document so it's easier to get to specific states of this form.