Update src/streamlit_app.py

src/streamlit_app.py

@@ -164,7 +164,8 @@ if "show_more" not in st.session_state:
 def set_user_query(q):
     st.session_state["user_query_input"] = q
 
-doc_choice = st.radio("", ["-- Select --", "Sample PDF", "Upload Custom PDF"], index=1)
+# <-- FIX: default index is 0 so "-- Select --" is shown on load
+doc_choice = st.radio("", ["-- Select --", "Sample PDF", "Upload Custom PDF"], index=0)
 
 if doc_choice == "-- Select --":
     st.info("⬅️ Select a document to begin.")