Revert design changes

app/javascript/dashboard/components-next/sidebar/Sidebar.vue

@@ -476,7 +476,9 @@ const menuItems = computed(() => {
 </script>
 
 <template>
-  <aside class="w-[12.5rem] h-screen flex flex-col text-sm pb-1">
+  <aside
+    class="w-[12.5rem] bg-n-solid-2 rtl:border-l ltr:border-r border-n-weak h-screen flex flex-col text-sm pb-1"
+  >
     <section class="grid gap-2 mt-2 mb-4">
       <div class="flex items-center min-w-0 gap-2 px-2">
         <div class="grid flex-shrink-0 size-6 place-content-center">