refactor: enforce frontend view model boundaries

src/app/ui/AppBreadcrumbs/AppBreadcrumbs.test.tsx

@@ -16,6 +16,7 @@ function renderBreadcrumbs(
 	accounts?: { id: string; name: string }[],
 ) {
 	useBrokerageAccounts.mockReturnValue({ data: accounts });
+
 	return render(
 		<MantineProvider>
 			<MemoryRouter initialEntries={[path]}>
@@ -70,6 +71,7 @@ describe("AppBreadcrumbs", () => {
 			"page",
 		);
 		expect(screen.getByRole("navigation")).toHaveAttribute("data-depth", "3");
+
 		for (const separator of screen.getAllByText("→")) {
 			expect(separator).toHaveAttribute("aria-hidden", "true");
 		}