Clear conversation state when entering debrief mode

app.py

@@ -253,6 +253,8 @@ else:
         col1, col2, col3 = st.columns([1, 2, 1])
         with col2:
             if st.button("🤔 I'm Ready to Debrief", use_container_width=True):
+                # Clear previous conversation state
+                st.session_state.messages = []
                 st.session_state.in_debrief = True
                 
                 # Get the original setup parameters