Add editor NIfTI download and float32 exports

Add quick ANTs registration profile

Make ANTs prep timeout and CPU detection robust

I changed prep_utils.py (line 266) so every ANTs subprocess now sets:

Register + normalize should stay CPU. That ANTs prep step is not the GPU-dependent part,

Dockerfile

Implemented a fix for the “runs forever” behavior by removing the two biggest blind spots: repeated runtime sync work and unbounded ANTs subprocess time.

...

Implemented. streamlit_app.py is now an integrated prep app with the flow described: