Fix: Await second microtask tick in copyUrl reject test

The .catch() handler on a rejected promise resolves on the second
microtask tick, not the first — one extra await Promise.resolve() is
needed before the assertion.

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

ui/src/app/detail/detail.component.spec.ts

@@ -190,6 +190,7 @@ describe('DetailComponent', () => {
     spyOn(navigator.clipboard, 'writeText').and.returnValue(Promise.reject(new Error('denied')));
     component.copyUrl();
     await Promise.resolve();
+    await Promise.resolve();
     expect(toast.show).toHaveBeenCalledWith('Failed to copy URL', 'error');
   });
 });