模拟器画布如何实现重新加载

## **Describe the bug (required)** / **详细描述 bug（必填）**


刷新这个iframe，并且重新加载资产包。rerender没有用。

Start by reproducing the simulator canvas behavior shown in the issue, focusing on refreshing the iframe and reloading the asset package; the issue does not name a file, test, or entry point. Trace the existing rerender path and determine why it does not reload these resources. Done means the simulator canvas and its asset package reload reliably.

Written by the indexing model from the issue text.