The flow command returned no data because:
1. The CSRF token may not be in the DOM yet when Angular is still
initializing — add a polling loop (up to 5s) to wait for it
2. The unusual_activity list is empty outside market hours — fall back
to the mostActive list which always has data
3. Remove the DOM table fallback that never matched (barchart uses
Angular components, not standard <tr> elements)
Alex Yang