Deduplicate guest tasks list and restore header icon

resources/js/guest/lib/__tests__/taskUtils.test.ts

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+import { dedupeTasksById } from '../taskUtils';
+
+describe('dedupeTasksById', () => {
+  it('returns empty array for empty input', () => {
+    expect(dedupeTasksById([])).toEqual([]);
+  });
+
+  it('keeps the first occurrence and preserves order', () => {
+    const tasks = [
+      { id: 1, title: 'A' },
+      { id: 2, title: 'B' },
+      { id: 1, title: 'A-dup' },
+      { id: 3, title: 'C' },
+    ];
+
+    expect(dedupeTasksById(tasks)).toEqual([
+      { id: 1, title: 'A' },
+      { id: 2, title: 'B' },
+      { id: 3, title: 'C' },
+    ]);
+  });
+});

resources/js/guest/lib/taskUtils.ts

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+export type TaskIdentity = {
+  id: number;
+};
+
+export function dedupeTasksById<T extends TaskIdentity>(tasks: T[]): T[] {
+  const seen = new Set<number>();
+  const unique: T[] = [];
+
+  tasks.forEach((task) => {
+    if (seen.has(task.id)) {
+      return;
+    }
+    seen.add(task.id);
+    unique.push(task);
+  });
+
+  return unique;
+}