Fix TARGET_SIZE: use 64x64x64 to match VesselMNIST3D training data

Add file header inspection to diagnose invalid NIfTI files

Add detailed file debugging to diagnose file path issues

Fix file validation: detect and handle misnamed .nii.gz files

Remove unused io import

Fix NIfTI encoding to use temp files instead of BytesIO

Fix Grad-CAM gradient issue and add debug logging

Add Grad-CAM visualization with 3D

Update app.py

Update app.py

Update app.py

Update app.py

Update app.py

Update app.py

Update app.py

Update app.py

Update app.py

Update app.py

Update app.py

Update app.py

Update requirements.txt

Update requirements.txt

Update app.py

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