ui: one badge per enabled signal, an N signals overflow, and the order kept in memory

src/ui_signals.cpp

@@ -602,6 +602,7 @@ void rebuild_signal_panels(App& app) {
     gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(app.trigger_toggle), FALSE);
   }
   signal_pages_sync(app);
+  sync_signal_badges(app);
   app.signal_generation = app.model->generation();
 }