In the previous commit, the LLaVA model was updated to support partial loading.
In this commit, the SigLIP model is updated in the same way.
This model is used for FLUX Redux. It's <4GB and only ever run in isolation, so it won't benefit from partial loading for the vast majority of users. Regardless, I think it is best if we make _all_ models work with partial loading.
PS: I also fixed the initial load dtype issue, described in the prev commit. It's probably a non-issue for this model, but we may as well fix it.
