fixing bug where changing theme was clearing narratiin

chatbot.py

@@ -100,6 +100,7 @@ def render_chatbot(code, output, error):
     st.session_state.setdefault('conversation', [])
     st.session_state.setdefault('chat_summary', "")
     st.session_state.setdefault('chat_display_count', 5)
+    st.session_state.setdefault('narrations', [])  # persist narrations
 
     c1, c2 = st.columns([4, 1], gap='small')
     with c1:
@@ -147,18 +148,22 @@ def render_chatbot(code, output, error):
         st.markdown(f'<div class="chat-message bot-message">{formatted}</div>', unsafe_allow_html=True)
 
         # 🔊 Speak
-        speak_btn = st.button(f"🔊 Narrate #{i+1}")
-        if speak_btn:
-            status_placeholder = st.empty()
-            status_placeholder.info("🧠 Generating narration...")
-            bot = CodeAssistantBot()
-            narration = bot.narrate_response(code, output, error, a, st.session_state.chat_summary)
-            status_placeholder.info("🎙️ Converting to audio...")
-            audio_filename = f"audio_{uuid.uuid4().hex}.mp3"
-            asyncio.run(text_to_speech(narration, audio_filename))
-            status_placeholder.success("🔊 Narration ready!")
-            st.audio(audio_filename, format="audio/mp3", autoplay=True)
-
+        if len(st.session_state.narrations) > i:
+            narration_text, narration_file = st.session_state.narrations[i]
+            st.audio(narration_file, format="audio/mp3")
+        else:
+            speak_btn = st.button(f"🔊 Narrate #{i+1}", key=f"narrate_{i}")
+            if speak_btn:
+                status_placeholder = st.empty()
+                status_placeholder.info("🧠 Generating narration...")
+                bot = CodeAssistantBot()
+                narration = bot.narrate_response(code, output, error, a, st.session_state.chat_summary)
+                status_placeholder.info("🎙️ Converting to audio...")
+                audio_filename = f"audio_{uuid.uuid4().hex}.mp3"
+                asyncio.run(text_to_speech(narration, audio_filename))
+                st.session_state.narrations.append((narration, audio_filename))
+                status_placeholder.success("🔊 Narration ready!")
+                st.rerun()
 
     if start > 0 and st.button("🔽 Show more"):
         st.session_state.chat_display_count += 5