QWEN 2511 image replace node

### Custom Node Testing

- [x] I have tried disabling custom nodes and the issue persists (see [how to disable custom nodes](https://docs.comfy.org/troubleshooting/custom-node-issues#step-1%3A-test-with-all-custom-nodes-disabled) if you need help)

### Expected Behavior

Node settings should remain unchanged during multiple runs unless specifically altered by the user.

### Actual Behavior

Qwen 2511 Image Edit: replacing input images resets UNet to default FP16 and clears prompt, even when saved as a normal workflow.

### Steps to Reproduce

Do a clothing replacement using FP8 model. Then upload new images for another run. Observe unet_name field.

### Debug Logs

```powershell
Nothing in the logs about this.
```

### Other

_No response_

Start by reproducing the clothing-replacement workflow with an FP8 model, then replace the input images in the Qwen 2511 Image Edit node. Done means the selected UNet remains unchanged and the prompt is preserved across multiple runs, including when the workflow is saved normally.

Written by the indexing model from the issue text.