ExtendedСSS and cosmetic rules are not applied to elements inside shadow dom

[spellcascade]

While working on the no-doomscroll filter list for Reddit, I encountered cases where some left sidebar items (Home, Popular, Explore, All) are rendered inside a Shadow DOM, which prevents selectors from applying to them with our current approach.

Rules:

reddit.com##left-nav-top-section h2
reddit.com##left-nav-top-section li

See if we can find a way to detect these elements and apply our rules.