fix warmup

app.py

@@ -177,7 +177,7 @@ with gr.Blocks(title="MathComp Retrieval (Qwen3 Embedding 4B)", theme=gr.themes.
     status_md = gr.Markdown("⏳ Loading model… (first time may take a bit)")
     def warmup():
         try:
-            _ = get_embedder("4B", True)  # safe default
+            _ = get_embedder()  # safe default
             return "✅ Model ready."
         except Exception as e:
             return f"⚠️ Warmup failed: {e}"