fix: declare model as global in transcribe function for proper access

app.py

@@ -24,6 +24,7 @@ def transcribe(audio, state=""):
     if audio is None:
         return state, state
 
+    global model
     # Move model to GPU if available
     if torch.cuda.is_available():
         print(f"CUDA device: {torch.cuda.get_device_name(0)}")