[frontend] bugfix: Incorrect read-only state after opening app publish history (#251)

1.shapes cannot move after exiting app detail page in readonly mode;
2. sometimes the graph doesn't go into readonly mode.

Author: reeeborn33

app-engine/frontend/src/components/timeLine/index.tsx

@@ -67,6 +67,7 @@ const TimeLineFc = (props) => {
       setTimeList([]);
       setPage(1);
       hasMoreRef.current = true;
+      elsaReadOnlyRef.current = true;
       window.agent?.readOnly();
 
       Promise.all([

app-engine/frontend/src/pages/components/header.tsx

@@ -164,6 +164,9 @@ const ChoreographyHead = (props) => {
 
   // 实时保存数据
   const updateGraph = async () => {
+    if (preview) {
+      return;
+    }
     const currentApp = cloneDeep(appInfo);
     currentApp.flowGraph.appearance = window.agent.serialize();
     await updateFlowInfo(tenantId, appId, currentApp.flowGraph);