Option to combine the tabs-bar into the titlebar

[jvanmourik]

Description

It would be nice to have an option which places the file tabs inside the titlebar. This would reduce the footprint of the editor and be in line with Zed's "Your editor should disappear" design goal.

If applicable, add mockups / screenshots to help present your vision of the feature

[dmkjfs]

+1, pretty annoying to see 2 or 3 bars that use space, instead of just one. I usually don't use the tab bar at all when im on laptop