Update src/app.py

added chat history download functionality

src/app.py

@@ -210,6 +210,29 @@ tab1, tab2, tab3 = st.tabs(["💬 Chat Playground", "📂 Knowledge & Tools", "
 # === TAB 1: CHAT ===
 with tab1:
     st.header("Discussion & Analysis")
+
+    # Chat History Downloader
+    # Only show the button if there is actually a conversation to save
+    if st.session_state.get("messages"):
+        # 1. Format the history log
+        chat_log = f"# ⚓ Navy AI Toolkit - Chat Log\n"
+        chat_log += f"Date: {datetime.now().strftime('%Y-%m-%d %H:%M')}\n"
+        chat_log += f"Model: {st.session_state.get('model_selector_radio', 'Unknown')}\n\n"
+        chat_log += "---\n\n"
+        
+        for msg in st.session_state.messages:
+            role = msg["role"].upper()
+            content = msg["content"]
+            chat_log += f"**{role}**: {content}\n\n"
+            
+        # 2. Render the Download Button (Right below header)
+        st.download_button(
+            label="💾 Download Conversation",
+            data=chat_log,
+            file_name=f"chat_session_{datetime.now().strftime('%Y%m%d_%H%M')}.md",
+            mime="text/markdown"
+        )
+    
     if "messages" not in st.session_state: st.session_state.messages = []
     
     # RENDER DEBUG OVERLAY (If enabled in Admin)