Default UI redesign (#7429)

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* Update default.sidebar.vue

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* Update sticky-sidebar.ts

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* Update messaging-room.form.vue

* Update timeline.vue

src/client/pages/notifications.vue

@@ -1,8 +1,6 @@
 <template>
-<div>
-	<div class="_section">
-		<XNotifications class="_content" @before="before" @after="after" page/>
-	</div>
+<div class="_root">
+	<XNotifications class="_content" @before="before" @after="after" page/>
 </div>
 </template>