Deduplicate guest tasks list and restore header icon

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

@@ -0,0 +1,22 @@
+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' },
+    ]);
+  });
+});