sidebar: show hamburger menu on subcategory header too
Right now it is only visible on the main category header. This commit puts it on the subcategory header page so that it's never inaccessible when the window is at its default size rather than widescreen or maximized.
Menu open | DIY back button hovered |
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This exposes that the DIY back button is kind of weird in its current state, and it might be happier as a ToolButton now. I could do that in this MR as a separate commit, or in another follow-up one, if people think that would be better. It would certainly remove a lot of code.
cc @teams/vdg