ValueError when running sam3_image_interactive.ipynb

### Bug Description
When running the `sam3_image_interactive.ipynb` notebook step-by-step, the model throws a `ValueError: Expected grad to be disabled` during the inference/activation step.

I was able to run it by changing `torch.inference_mode().__enter__()` to `torch.set_grad_enabled(False)` but I wanted to flag this in case someone else encounters it too or if someone can help me understand why that happened.