Remove the elevation component from all toolbars and the bottom bar.
Material3 states that top and bottom app bars should not cast a drop
shadow. Auxio ignored this and used one anyway. This largely stemmed
from incorrect use of the AppBarLayout styles, which were mostly just
incorrect M2 styles with a new background plastered over. Fix this
by creating a new style that inherits the proper M3 styles and then
using that on all AppBarLayout instances in the app.
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