Fix space hierarchy not updating when user mutates it

src/dispatcher/actions.ts

@@ -193,4 +193,9 @@ export enum Action {
      * Switches space. Should be used with SwitchSpacePayload.
      */
     SwitchSpace = "switch_space",
+
+    /**
+     * Signals to the visible space hierarchy that a change has occurred an that it should refresh.
+     */
+    UpdateSpaceHierarchy = "update_space_hierarchy",
 }