fix: gr.Markdown does not accept scale kwarg, wrap in Column instead

app.py

@@ -324,11 +324,10 @@ def build_app() -> gr.Blocks:
 
         # HF OAuth login — must be at top level of Blocks for the redirect to work
         with gr.Row():
-            gr.LoginButton(scale=0)
-            gr.Markdown(
-                "_Sign in with your HuggingFace account so we can credit your contribution._",
-                scale=1,
-            )
+            with gr.Column(scale=0, min_width=200):
+                gr.LoginButton()
+            with gr.Column(scale=1):
+                gr.Markdown("_Sign in with your HuggingFace account so we can credit your contribution._")
 
         with gr.Row():
             # ---- Left column: config + exercise ----