8cac0b4fc1
Three component stylesheets carried `:where(.dark) &` rules to react to the `<html>.dark` class. Angular's emulated CSS encapsulation descends into `:where()` and rewrites its contents with the `_ngcontent-XXX` scoping attribute — the produced selector then demands that `<html>` (which carries `.dark`) also carry the scoping attribute, which it doesn't, so the rules never matched. Visible symptom: the main page background and a handful of inner states (sidebar hover/focus/active, theme-switcher menu surface) stayed light even when `.dark` was on `<html>` and every Tailwind `dark:` utility in the templates was working correctly. Fixes: - `app.scss` and `sidebar.scss` switch to `:host-context(.dark)` for their dark variants. The Angular template compiler recognises `:host-context()` and expands it without forcing the ancestor to carry the scoping attribute. - `theme-switcher` switches to `ViewEncapsulation.None`. Its CDK menu opens in an overlay portal outside the component's host, so even `:host-context()` would miss it. The styles ship globally; the BEM-style class names (`.theme-switcher__menu`, ...) are specific enough to keep the rules contained. Drive-by: - Remove the right border on the header logo zone — the visible vertical hairline above the sidebar was extra noise; the alignment of widths already carries the visual relationship to the rail below.