Talking about that, I'm also using the new Libadwaita ToolbarView in Junction.
Combined with Breakpoint, not only it makes it easy to have dynamic header / footer bars but it also takes care of the small-er design concerns that are easy to miss.
An other great primititve 👌️
Looking forward porting Tangram to it and having a Library entry for it in Workbench.
https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/class.ToolbarView.html
@sonny@floss.social wow, it looks super neat :D