* Add better library item selectors
Inspired by the J2K method of library item selection.
* Tweak theme selection colors
It was missing for Hot Pink and Midnight Dusk.
The selector color is 75% alpha of the color accent, this looked fitting for all themes.
(cherry picked from commit 88d9ffe92e41ab8a4d24655a32aa87a20ee8bd01)
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