New horizontal tabs

[robin-lecomte]

Two new horizontal tab variants:

1. Classic
2. Line, featuring an underline for differentiation, or specific uses

@lysianelagadic @PanchoutNathan what do you think?

[robin-lecomte]

I’m still torn between making the buttons blue or black. I’m trying to limit the use of blue in the UI kit to clearly prioritize the options and avoid heavy cognitive overload: blue everywhere = choices everywhere?