refactor(guest): retire legacy guest app and move shared modules

resources/js/shared/guest/lib/engagement.ts

@@ -0,0 +1,8 @@
+import type { EventData } from '../services/eventApi';
+
+export function isTaskModeEnabled(event?: EventData | null): boolean {
+  if (!event) return true;
+  const mode = event.engagement_mode;
+  if (!mode) return true;
+  return mode === 'tasks';
+}