chore(app): use new utilities

Author: benjamincanac

src/App.vue

@@ -30,7 +30,7 @@
 
       <UFooter>
         <template #left>
-          <p class="text-sm text-(--ui-text-muted)">
+          <p class="text-sm text-muted">
             Copyright © {{ new Date().getFullYear() }}
           </p>
         </template>