feat: improve drag & drop

* permits multiple drag & drop
 * synchronize grid & list view on selection
 * permits copy during ddrag & drop (use sift/alt key according your OS)
 * use batch move / copy on drag & drop

static/js/core/notifications.js

@@ -79,7 +79,6 @@ const notifications = (() => {
     }
     function _renderBadge() {
         const badge = $('notif-badge');
-        console.log(`badge`, badge);
         if (!badge) return;
         if (_badgeCount > 0) {
             badge.classList.remove("hidden");