fix(dark mode): dark mode adjustments (#1069)

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/1069
Reviewed-by: dpschen <dpschen@noreply.kolaente.de>
Co-authored-by: konrad <k@knt.li>
Co-committed-by: konrad <k@knt.li>

src/components/quick-actions/quick-actions.vue

@@ -507,6 +507,8 @@ export default {
 		.active-cmd {
 			font-size: 1.25rem;
 			margin-left: .5rem;
+			background-color: var(--grey-100);
+			color: var(--grey-800);
 		}
 	}
 

src/styles/custom-properties/colors.scss

@@ -76,7 +76,9 @@
   --card-border-color: var(--grey-200);
   --logo-text-color: hsl(180, 1%, 15%);
 
-
+  --link: var(--primary);
+  --link-hover: hsla(var(--primary-h), var(--primary-s), var(--primary-l), .75);
+  --border: var(--grey-200);
 
   &.dark {
     // Light mode colours reversed for dark mode