bf16 dequant only in warmup (no generate fallback) — surface warmup failures

app.py

@@ -180,7 +180,6 @@ def generate(
             gr.Warning("`outlines` is not installed — upsampling without structural constraints.")
         final_prompt = upsample_prompt(prompt, int(width), int(height))
 
-    _ensure_bf16_transformers()
     generator = torch.Generator(device="cuda").manual_seed(int(seed))
     preset = MODES.get(mode, MODES["Default · 20 steps"])
     image = pipe(