fix(core): load chat history content correctly (#13149)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Bug Fixes**
* Improved session handling in chat to prevent potential errors when
reloading sessions.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/core/src/desktop/pages/workspace/chat/index.tsx

@@ -125,7 +125,10 @@ export const Component = () => {
         .getSession(workspaceId, sessionId)
         .then(session => {
           setCurrentSession(session);
-          chatContent?.reloadSession();
+          if (chatContent) {
+            chatContent.session = session;
+            chatContent.reloadSession();
+          }
           chatTool?.closeHistoryMenu();
         })
         .catch(console.error)