Update app.py

app.py

@@ -378,7 +378,7 @@ def display_pet_details(pet_id):
         if st.button("Add to Favorites"):
             st.session_state.favorites.append(pet)
             st.success(f"Added {pet['name']} to favorites!")
-            st.experimental_rerun()
+            st.rerun()
     else:
         if st.button("Remove from Favorites"):
             st.session_state.favorites = [p for p in st.session_state.favorites if p['id'] != pet['id']]