Fix Streamlit compatibility issue with container border parameter

app.py

@@ -164,10 +164,12 @@ if st.session_state.messages and len(st.session_state.messages) > 0:
             
             # Show conversation preview
             st.markdown("**Conversation Preview for HF Expert:**")
-            with st.container(border=True):
-                for i, msg in enumerate(st.session_state.messages[-5:]):  # Last 5 messages
-                    role = "👤 You" if msg["role"] == "user" else "🤖 Assistant"
-                    st.markdown(f"**{role}:** {msg['content'][:100]}{'...' if len(msg['content']) > 100 else ''}")
+            # Create a container-like appearance without using the border parameter
+            st.markdown("---")
+            for i, msg in enumerate(st.session_state.messages[-5:]):  # Last 5 messages
+                role = "👤 You" if msg["role"] == "user" else "🤖 Assistant"
+                st.markdown(f"**{role}:** {msg['content'][:100]}{'...' if len(msg['content']) > 100 else ''}")
+            st.markdown("---")
         
         with col2:
             if st.button("🧠 Activate HF Expert",