fix krea2 GGUF dequant dtype on mps - #9573
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Summary
Fix Krea-2 GGUF generation producing noise on Apple MPS devices.
Krea-2 GGUF dequantization now uses FP32 on MPS, where BF16 dequantization was found to produce noisy images. Other devices retain existing BF16-safe behavior, while explicit precision settings remain honored outside MPS.
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What's Newcopy (if doing a release after this PR)