Various Bugfixes + Spaces Demo

[painebenjamin]

Hello!

I was impatient and wanted to get this to work, so I tried installing from your branch. There were various issues that needed to be fixed for it to work, though.

You can see a working version running in a ZeroGPU space: https://huggingface.co/spaces/benjamin-paine/Lumina-Image-2.0

In addition to these code changes, I had to do two other things:

1. I had to change ffn_dim_multiplier from null to 1.5 in transformer/config.json
2. I had to rename the context_refiner.<N>.norm1.norm weights to remove the final .norm part since you made the context_refiner normalization layers plain RMSNorms.

Both of those changes are in a repository on HF at https://huggingface.co/benjamin-paine/Lumina-Image-2.0/tree/main.

Once the model is settled in your main repository I'll go ahead and delete my copies so there's no confusion. :)

Thank you for your hard work!