Complete training workflow and acceptance hardening

frontend/src/features/auth/Login.tsx

@@ -1,10 +1,22 @@
 // Экран входа. Ставится перед всеми остальными: номер занятия перестал быть
 // пропуском, по ссылке пускает роль, а не знание адреса (lct-23).
 
-import { useState, type MouseEvent, type ReactNode } from "react";
+import { useEffect, useState, type MouseEvent, type ReactNode } from "react";
 
 import { DEMO_MODE, SCREENS, useDemoLogin, useLogin, useLogout, useMe } from "./useAuth";
 
+const preloadScreenModule: Record<string, () => Promise<unknown>> = {
+  "/trainee": () => import("@/pages/trainee/Call"),
+  "/instructor": () => import("@/pages/instructor/Instructor"),
+  "/wall": () => import("@/pages/wall/Wall"),
+  "/profile": () => import("@/pages/profile/Profile"),
+  "/groups": () => import("@/pages/groups/Groups"),
+  "/dds": () => import("@/pages/dds/Dds"),
+  "/phone": () => import("@/pages/phone/Phone"),
+  "/materials": () => import("@/pages/materials/Materials"),
+  "/admin": () => import("@/pages/admin/Admin"),
+};
+
 function DemoLinks() {
   const openScreen = (event: MouseEvent<HTMLAnchorElement>, path: string) => {
     event.preventDefault();
@@ -33,6 +45,12 @@ export function RequireAuth({ screen, children }: { screen: string; children: Re
   const me = useMe();
   const logout = useLogout();
 
+  // Fetch only static route code while the signed cookie is being checked;
+  // user data and the screen itself remain gated by the role check below.
+  useEffect(() => {
+    void preloadScreenModule[screen]?.().catch(() => undefined);
+  }, [screen]);
+
   if (me.isLoading) {
     return <main className="page"><p>Проверяем доступ…</p></main>;
   }
@@ -76,7 +94,7 @@ function Login() {
             <tr>
               <th>Логин</th>
               <td>
-                <input value={name} autoFocus onChange={(event) => setName(event.target.value)} />
+                <input aria-label="Логин" value={name} autoFocus onChange={(event) => setName(event.target.value)} />
               </td>
             </tr>
             <tr>
@@ -84,6 +102,7 @@ function Login() {
               <td>
                 <input
                   type="password"
+                  aria-label="Пароль"
                   value={password}
                   onChange={(event) => setPassword(event.target.value)}
                 />

frontend/src/features/auth/useAuth.ts

@@ -73,7 +73,7 @@ export function useLogout() {
 /** Какие экраны открыты роли. Повторяет domain/roles.py: список короткий
  *  и меняется редко, а держать его на сервере ради двух строк — лишний запрос. */
 export const SCREENS: Record<Role, string[]> = {
-  admin: ["/admin", "/profile", "/groups", "/materials"],
+  admin: ["/admin", "/wall", "/profile", "/groups", "/materials"],
   instructor: ["/instructor", "/wall", "/profile", "/dds", "/phone", "/groups", "/materials"],
   trainee: ["/trainee", "/dds", "/phone", "/profile", "/materials"],
 };