add Notifications view

src/views/NotificationsView.tsx

@@ -1,7 +1,7 @@
 export function NotificationsView() {
   return (
-    <div className="flex flex-1 flex-col gap-1 p-4">
+    <div className="flex flex-1 flex-col gap-1 p-4 items-center">
-      <p className="text-sm text-muted-foreground">Notifications coming soon.</p>
+      <p className="text-sm text-muted-foreground">No notifications.</p>
     </div>
   )
 }