guest pwa: hide tasks when inactive and improve empty gallery state

resources/js/guest-v2/components/AppShell.tsx

@@ -24,7 +24,7 @@ export default function AppShell({ children }: AppShellProps) {
   const [compassOpen, setCompassOpen] = React.useState(false);
   const [notificationsOpen, setNotificationsOpen] = React.useState(false);
   const [settingsOpen, setSettingsOpen] = React.useState(false);
-  const { tasksEnabled, event, token } = useEventData();
+  const { tasksEnabled, hasActiveTasks, event, token } = useEventData();
   const notificationCenter = useOptionalNotificationCenter();
   const navigate = useNavigate();
   const location = useLocation();
@@ -73,7 +73,8 @@ export default function AppShell({ children }: AppShellProps) {
           key: 'tasks',
           label: t('navigation.tasks', 'Tasks'),
           icon: <Sparkles size={18} color={actionIconColor} />,
-          onPress: goTo('/tasks'),
+          onPress: hasActiveTasks ? goTo('/tasks') : undefined,
+          disabled: !hasActiveTasks,
         }
       : {
           key: 'settings',