Refresh file list when there are queued snapshots (#697)

* add destroy hook

* refresh details modal in interval

* refactor to refresh assets list

* disable create snapshot button when there is a pending snapshot

bookmarks/frontend/behaviors/dropdown.js

@@ -1,8 +1,8 @@
-import { registerBehavior } from "./index";
+import { Behavior, registerBehavior } from "./index";
 
-class DropdownBehavior {
+class DropdownBehavior extends Behavior {
   constructor(element) {
-    this.element = element;
+    super(element);
     this.opened = false;
     this.onOutsideClick = this.onOutsideClick.bind(this);