Fix error on prod when debug store module is absent

Simplifying a bit style function, as points can also have a fill (it won't change the look and feel)

I've used two colors defined in our SCSS as starting point for the highlighting colors, and use a tool that "spread" the colors to chose the two middle points (also making sure it is color blind safe)

instead of adding a border around the feature detail, we now change the whole feature detail's background color to signify it is highlighted

…d_feature

PB-123 : Change color of hovered feature