added scrolling node and got rid of prolific url (code only)

src/streamlit_app.py

@@ -992,6 +992,7 @@ def screen_chat(s):
         st.info(f"Maximum turns ({MAX_TURNS}) reached. Please proceed.")
     else:
         st.caption(f"Turns: {num_turns} / minimum {MIN_TURNS}")
+    st.caption("💡 If you don't see the latest messages, scroll down while hovering over the conversation.")
 
     if num_turns < MAX_TURNS:
         user_msg = st.text_area(
@@ -1155,16 +1156,7 @@ def screen_done(s):
     st.markdown("---")
     st.success(
         f"**Your completion code:** `{PROLIFIC_COMPLETION_CODE}`\n\n"
-        "You can either click the button below to return to Prolific automatically, "
-        "or copy the code above and paste it on the Prolific website."
-    )
-    st.markdown(
-        f"""<a href="{PROLIFIC_COMPLETION_URL}" target="_self">
-        <button style="background:#2563eb;color:white;border:none;padding:12px 28px;
-                       font-size:1rem;border-radius:6px;cursor:pointer;margin-top:8px;">
-            ✅ Return to Prolific
-        </button></a>""",
-        unsafe_allow_html=True,
+        "Please copy this code and paste it on the Prolific website to complete your submission."
     )