ui: stale tooltip wording

The dock button's tooltip, the guided-tour menu row's tooltip and the m / g shortcut labels still described a side panel and tabs.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/ui.cpp

@@ -4893,7 +4893,7 @@ GtkWidget* build_toolbar(App& app) {
 
   app.menu_tour_row = menu_button("Guided tour", "Ctrl+T");
   gtk_widget_set_tooltip_text(app.menu_tour_row,
-                              "walk over the plot, the side panel, the trigger, the signals and "
+                              "walk over the plot, the badges, the trigger, the dock, the signals and "
                               "the status line, one step at a time");
   g_signal_connect(app.menu_tour_row, "clicked", G_CALLBACK(on_tour_clicked), &app);
   gtk_box_append(GTK_BOX(help_box), app.menu_tour_row);