Active tab is only differentiated by color

[mopotek]

Issue

• Active tab is only differentiated from other tabs by green color
• this goes against accessibility best practices

Fix suggestion

• apply bold style to active tab
• maybe filled icon style for active tab?

[Dehelssey]

That's something i fixed in my latest designs of Mangane

BUT, since we're not ready yet to move on to this UI, yeah, we should totally implement something in the meantine.
I assume we could go with bold label. Or a bar or dot at the bottom. Maybe a background.
The current icon set doesn't provide "filled" version for every icons though