Wrap tabs as needed

[leonardgerardatomicmachinescom]

I generate a lot of tabs and end up needing to scroll left right all the time. This MR allows the notebook to put tabs on multiple lines as needed.

[karolzak]

Thanks for your first contribution @leonardgerardatomicmachinescom ! I'm not sure I fully understand what this change does, could you please share some screenshot examples of before and after for me to better understand this? Thanks!