Add loading state (#1027)

* add loading state

* update snapshots

* add border radius

* fix comment breaking build jsx

src/appState.ts

@@ -5,6 +5,7 @@ export const DEFAULT_FONT = "20px Virgil";
 
 export function getDefaultAppState(): AppState {
   return {
+    isLoading: false,
     draggingElement: null,
     resizingElement: null,
     multiElement: null,
@@ -47,6 +48,7 @@ export function clearAppStateForLocalStorage(appState: AppState) {
     isResizing,
     collaborators,
     isCollaborating,
+    isLoading,
     ...exportedState
   } = appState;
   return exportedState;