refactor: align frontend ownership boundaries

Close audit gaps across API drift, query policy, UI, and tests.

src/app/routes/RouteErrorBoundary.test.tsx

@@ -1,8 +1,8 @@
 import { MantineProvider } from "@mantine/core";
-import { cleanup, render, screen, waitFor } from "@testing-library/react";
+import { render, screen, waitFor } from "@testing-library/react";
 import type { FC } from "react";
 import { MemoryRouter, useLocation, useNavigate } from "react-router";
-import { afterEach, describe, expect, it, vi } from "vitest";
+import { describe, expect, it, vi } from "vitest";
 import { RouteErrorBoundary } from "./RouteErrorBoundary";
 
 let authenticated = false;
@@ -52,7 +52,6 @@ function renderBoundary(path: string) {
 }
 
 describe("RouteErrorBoundary", () => {
-	afterEach(cleanup);
 	it("offers login after a public route error without error details", () => {
 		authenticated = false;
 		renderBoundary("/login");