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

app.py

@@ -346,8 +346,10 @@ with gr.Blocks(
 
     # ── Header ────────────────────────────────────────────────────────────────
     with gr.Row(elem_id="title-row"):
-        gr.Markdown("# FlipVQA-Miner: Multimodal Knowledge Extraction", scale=5)
-        lang_btn = gr.Button(T["zh"]["lang_btn"], elem_id="lang-btn", scale=0, size="sm")
+        with gr.Column(scale=5):
+            gr.Markdown("# FlipVQA-Miner: Multimodal Knowledge Extraction")
+        with gr.Column(scale=0, min_width=110):
+            lang_btn = gr.Button(T["zh"]["lang_btn"], elem_id="lang-btn", size="sm")
 
     subtitle_md = gr.Markdown(T["zh"]["subtitle"])
     desc_md     = gr.Markdown(T["zh"]["desc"])