style: drop redundant comments and apply formatting

Frontend now uses double quotes and semicolons. No behaviour change.

src/test/helpers.tsx

@@ -1,65 +1,71 @@
-import { render } from '@testing-library/react'
-import userEvent from '@testing-library/user-event'
-import { MemoryRouter } from 'react-router'
-import { vi } from 'vitest'
-import type { Book, Genre, User } from '../api'
-import { AppRoutes } from '../App'
-import { AuthProvider } from '../auth/AuthContext'
+import { render } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { MemoryRouter } from "react-router";
+import { vi } from "vitest";
+import type { Book, Genre, User } from "../api";
+import { AppRoutes } from "../App";
+import { AuthProvider } from "../auth/AuthContext";
 
-export const alice: User = { id: 1, username: 'alice' }
+export const alice: User = { id: 1, username: "alice" };
 export const genres: Genre[] = [
-  { id: 3, name: 'Fantasy' },
-  { id: 5, name: 'Science Fiction' },
-]
+  { id: 3, name: "Fantasy" },
+  { id: 5, name: "Science Fiction" },
+];
 export const dune: Book = {
   id: 7,
-  title: 'Dune',
-  author: 'Frank Herbert',
-  genre: { id: 5, name: 'Science Fiction' },
+  title: "Dune",
+  author: "Frank Herbert",
+  genre: { id: 5, name: "Science Fiction" },
   total_pages: 380,
   current_page: 142,
-  status: 'reading',
-  created_at: '2026-10-01T10:00:00+00:00',
-  updated_at: '2026-10-01T10:00:00+00:00',
-}
+  status: "reading",
+  created_at: "2026-10-01T10:00:00+00:00",
+  updated_at: "2026-10-01T10:00:00+00:00",
+};
 
-type Reply = [status: number, body?: unknown]
-type Handler = (request: { body: unknown; url: URL }) => Reply
-export type Call = { method: string; path: string; body: unknown }
+type Reply = [status: number, body?: unknown];
+type Handler = (request: { body: unknown; url: URL }) => Reply;
+export type Call = { method: string; path: string; body: unknown };
 
-/** Replaces fetch (the network boundary) with route handlers keyed by "METHOD /api/path". */
 export function mockApi(routes: Record<string, Handler>): Call[] {
-  const calls: Call[] = []
+  const calls: Call[] = [];
   vi.stubGlobal(
-    'fetch',
+    "fetch",
     vi.fn(async (input: string, init: RequestInit = {}) => {
-      const url = new URL(input, 'http://localhost')
-      const method = init.method ?? 'GET'
-      const body = typeof init.body === 'string' ? JSON.parse(init.body) : undefined
-      calls.push({ method, path: url.pathname + url.search, body })
-      const handler = routes[`${method} ${url.pathname}`]
-      const [status, data] = handler ? handler({ body, url }) : [500, { error: `No mock for ${method} ${url.pathname}` }]
+      const url = new URL(input, "http://localhost");
+      const method = init.method ?? "GET";
+      const body =
+        typeof init.body === "string" ? JSON.parse(init.body) : undefined;
+      calls.push({ method, path: url.pathname + url.search, body });
+      const handler = routes[`${method} ${url.pathname}`];
+      const [status, data] = handler
+        ? handler({ body, url })
+        : [500, { error: `No mock for ${method} ${url.pathname}` }];
       return new Response(status === 204 ? null : JSON.stringify(data), {
         status,
-        headers: { 'Content-Type': 'application/json' },
-      })
+        headers: { "Content-Type": "application/json" },
+      });
     }),
-  )
-  return calls
+  );
+  return calls;
 }
 
 export function signedIn(routes: Record<string, Handler> = {}): Call[] {
-  return mockApi({ 'GET /api/auth/me': () => [200, alice], 'GET /api/genres': () => [200, genres], ...routes })
+  return mockApi({
+    "GET /api/auth/me": () => [200, alice],
+    "GET /api/genres": () => [200, genres],
+    ...routes,
+  });
 }
 
 export function renderApp(url: string) {
-  const user = userEvent.setup()
+  const user = userEvent.setup();
   render(
     <MemoryRouter initialEntries={[url]}>
       <AuthProvider>
         <AppRoutes />
       </AuthProvider>
     </MemoryRouter>,
-  )
-  return user
+  );
+  return user;
 }