fix: skip second trace loop when helper succeeds to avoid duplicate traces

explorer.py

@@ -1963,6 +1963,7 @@ def build_trajectories_tab(db_path: str, window_size: str) -> None:
 
     fig = go.Figure()
     trace_count = 0
+    helper_succeeded = False
     # New: delegate plotting selection to helper for testability
     # Note: select_trajectory_plot_data returns (fig, trace_count, banner_text)
     try:
@@ -1973,6 +1974,7 @@ def build_trajectories_tab(db_path: str, window_size: str) -> None:
         if fig2 is not None:
             fig = fig2
             trace_count = trace_count2
+            helper_succeeded = True
             if banner_text:
                 try:
                     st.caption(banner_text)
@@ -2002,6 +2004,8 @@ def build_trajectories_tab(db_path: str, window_size: str) -> None:
                 st.text_area("select_trajectory_plot_data traceback", tb, height=240)
             except Exception:
                 pass
+    print(f"[TRAJ DEBUG] helper_succeeded={helper_succeeded}")
+    if not helper_succeeded:
         for party in selected_parties:
             if party not in centroids:
                 continue