loading-spinner: Adjust --spinner-color and --spinner-bg-color for color mode

Author: eth3lbert

app/components/loading-spinner.module.css

@@ -1,6 +1,6 @@
 .spinner {
-    --spinner-color: black;
-    --spinner-bg-color: rgba(0, 0, 0, .2);
+    --spinner-color: light-dark(black, white);
+    --spinner-bg-color: light-dark(rgba(0, 0, 0, .2), rgba(255, 255, 255, .2));
     --spinner-size: 16px;
 
     display: inline-block;