AppV2 dark mode color issues [FoundryVTT v13]

[KitCat420]

When using the zinc color scheme with a dark application theme, there's a rogue CSS rule that makes a.active elements unreadable, and the scrollbar is rather hard to spot. The same happens on the oceanic theme.

A problem similar in nature happens when using light application theme where most the CSS applies to default applications but doesn't affect all rules, making most the text barely readable, as a lot of the underlying HTML structure has changed.

It might be a good idea to scope all CSS that is app related to Application v1, purposefully excluding any AppV2 applications until the system is utilizing AppV2 itself and can thus apply sensible styling.