The latest compiled prompt may not be reflected in the text area

[SegaraRai]

We may need to try updating the value several times until it is reflected correctly, especially when closing with Ctrl-Enter.

[SegaraRai]

I think I've figured out the cause. When Ctrl+Z is handled incorrectly by ComfyUI, the workflow node and the UI textarea node are recreated. Before reflecting the value, it is necessary to check if the node exists in the document. If it does not exist, then the appropriate node must be searched for based on host application-specific logic. (It may have disappeared.)

Additionally, when addressing this issue in a subsequent commit, ensure that keyboard shortcuts like Ctrl+Z are not handled by ComfyUI while Prompt Studio is open. This requires adding a window.addEventListener("keydown") in the demo and confirming via E2E testing that the event does not reach the host application.