Move repeated table rendering helpers into a new application/helpers/dashboard_helper.php and load it from the Dashboard controller to remove duplication in views. Improve mobile/responsive dashboard behavior: detect mobile user agent to reduce recent-QSO rows, add mobile-specific quick links, collapse cards for compact display, and adjust HTMX polling intervals and targets. Add htmx loading indicators and last-updated timestamps with a small JS handler, and include minor CSS tweaks. Also add a session validation early-return in radio_display_component and load the user_agent library in the controller.
