Extract foundry highlight text shadow to mixin

src/scss/components/_check.scss

@@ -1,9 +1,11 @@
+@use "../utils/mixins";
+
 .ds4-check {
     cursor: pointer;
     display: flex;
     justify-content: space-between;
 
     &:hover {
-        text-shadow: 0 0 10px red;
+        @include mixins.foundry-highlight-text-shadow;
     }
 }

src/scss/utils/_mixins.scss

@@ -30,3 +30,7 @@
         background-color: transparent;
     }
 }
+
+@mixin foundry-highlight-text-shadow {
+    text-shadow: 0 0 10px red;
+}