Why not make it easy on yourself and use qt(6|5)ct and Kvantum to theme Sigil? That way, you can start with something that already "works" for the most part. No need to come up with your own qss to customize every aspect of Sigil when there's likely a Kvantum theme that will get you very close.
I'm also not certain why you have 3 extra TreeView# selectors with identical colors when the original global TreeView selector would suffice. It would be one thing if you wanted different colors for the different Sigil TreeViews, but that doesn't seem to be the case.
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