Change "Show Artist" functionality to be hover-based on desktop
There is precisely one circumstance under which the "Show Artist" button in the navigation toolbar appears and is useful: when you have accessed an album from the "Albums" view in the sidebar. In every other circumstance, it is redundant because you got to the Album view by navigating there from the artist view first, so you can just click the back button. As a result, most of the time that this button is displayed, it is just taking up space, causing artist and album names to elide earlier, and not being very relevant.
Removing it entirely is overkill though. So instead, let's make the artist name in the navigation toolbar clickable, and clicking on it will take the user to the artist view. This way we can remove the button. Making the UX hover-based makes it less discoverable, but this is an acceptable price to pay for such an esoteric and mostly-useless piece of functionality, and it re-uses users' familiarity with other clickable labels in the headerbar.
This change is only made for the desktop UI; no changes are made for the mobile UI, since hover-based UIs don't work at all there.
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