visualize3d() makes training freeze when saving 3D previews due to incorrect PyVista off-screen timing

[perctrix]

This pull request makes a focused improvement to the 3D visualization workflow in mipcandy/data/visualization.py. The main change ensures that when a screenshot is requested, the Plotter is created in off-screen mode, which is the correct way to capture screenshots without displaying a window.

Visualization update:

• In the _visualize3d_with_pyvista function, the Plotter is now initialized with off_screen=True if a screenshot is requested, instead of setting p.off_screen after creation. This ensures proper off-screen rendering for screenshots.

fixed #54

[ATATC]

Pull Request Status Update

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Reasons behind This Decision

Good.

What to Expect Next

It will be merged shortly.