added slider and some ui fixes

codeeditor-app/elements/session-list/session-list.less

@@ -0,0 +1,15 @@
+@import url('../../../shared/theme.less');
+
+session-list:empty::before {
+    display: block;
+    position: relative;
+    padding: 10px;
+    color: @primary-text-color-dark;
+    content: "There is no sessions within the last 30 days";
+}
+
+@media (prefers-color-scheme: dark) {
+    session-list {
+        color: @primary-text-color-white;
+    }
+}

codeeditor-app/elements/session-list/session-list.ts

@@ -38,9 +38,9 @@ export class SessionList extends BaseElement {
 
                     this.appendChild(ele);
                 }
+                //do this in item instead:
                 else {
-                    exists.setAttribute("numberOfChanges", session.numberOfChanges);
-                    exists.getElementsByClassName("session-list-item-number-of-changes")[0].innerHTML = session.numberOfChanges;
+                    (<any>exists).updateNumberOfChanges(session.numberOfChanges);
                 }
             }
         });