fix: gr.Code language param incompatible with gradio 5

app.py

@@ -859,7 +859,7 @@ Query Input
         # ── Tab 4: Citation ───────────────────────
         with gr.Tab("📚 Citation"):
             gr.HTML('<div class="section-header">BibTeX</div>')
-            gr.Code(value=BIBTEX, language="", label="BibTeX")
+            gr.Textbox(value=BIBTEX, label="BibTeX", lines=10, max_lines=15)
 
             gr.Markdown("""
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