feat(frontend): migrate LoginPage, RegisterPage, ProfilePage to design system

- LoginPage: <input>/<label> → <TextField>, <button> → <Button>,
  <h1> → <Heading>, inline error → <Text tone="negative">
- RegisterPage: same pattern, 4 fields, minLength via slotProps.htmlInput
- ProfilePage: <div> inline styles → <Surface>, <input> → <TextField>,
  <button> → <Button>, email/role → <Text>+<Text variant="label">
- Tests: loading state checks updated from text change to
  toBeDisabled() (DS Button keeps text, shows spinner)
- 264 lines removed, 134 net reduction

apps/frontend/src/pages/login/LoginPage.test.tsx

@@ -1,5 +1,5 @@
 import { describe, it, expect } from 'vitest';
-import { screen } from '@testing-library/react';
+import { screen, waitFor } from '@testing-library/react';
 import { Routes, Route } from 'react-router-dom';
 import userEvent from '@testing-library/user-event';
 import { http, HttpResponse } from 'msw';
@@ -72,6 +72,8 @@ describe('LoginPage', () => {
     await user.type(screen.getByPlaceholderText('••••••••'), 'password');
     await user.click(screen.getByRole('button', { name: 'Войти' }));
 
-    expect(await screen.findByText('Вход...')).toBeInTheDocument();
+    await waitFor(() => {
+      expect(screen.getByRole('button', { name: 'Войти' })).toBeDisabled();
+    });
   });
 });

apps/frontend/src/pages/login/ui/LoginPage.tsx

@@ -1,5 +1,7 @@
 import { useState, type FormEvent } from 'react';
 import { Link, useNavigate, useSearchParams } from 'react-router-dom';
+import { Box } from '@mui/material';
+import { Button, Heading, Text, TextField } from '@moex-vibe/design-system';
 import { useSession } from '@/entities/session';
 
 export function LoginPage() {
@@ -28,84 +30,44 @@ export function LoginPage() {
   }
 
   return (
-    <div style={{ maxWidth: 400, margin: '60px auto' }}>
-      <h1 style={{ marginBottom: 24, fontSize: 24, fontWeight: 700 }}>Вход</h1>
-      <form onSubmit={handleSubmit} style={{ display: 'flex', flexDirection: 'column', gap: 16 }}>
-        {error && <div style={{ color: 'var(--color-negative)', fontSize: 14 }}>{error}</div>}
-        <div>
-          <label
-            style={{
-              display: 'block',
-              marginBottom: 4,
-              fontSize: 14,
-              color: 'var(--color-text-secondary)',
-            }}
-          >
-            Email
-          </label>
-          <input
-            type="email"
-            value={email}
-            onChange={(e) => setEmail(e.target.value)}
-            required
-            style={inputStyle}
-            placeholder="email@example.com"
-          />
-        </div>
-        <div>
-          <label
-            style={{
-              display: 'block',
-              marginBottom: 4,
-              fontSize: 14,
-              color: 'var(--color-text-secondary)',
-            }}
-          >
-            Пароль
-          </label>
-          <input
-            type="password"
-            value={password}
-            onChange={(e) => setPassword(e.target.value)}
-            required
-            style={inputStyle}
-            placeholder="••••••••"
-          />
-        </div>
-        <button type="submit" disabled={loading} style={buttonStyle}>
-          {loading ? 'Вход...' : 'Войти'}
-        </button>
-        <p style={{ textAlign: 'center', fontSize: 14, color: 'var(--color-text-secondary)' }}>
+    <Box maxWidth={400} mx="auto" mt={7.5}>
+      <Heading level={1} size="title">
+        Вход
+      </Heading>
+      <Box
+        component="form"
+        onSubmit={handleSubmit}
+        sx={{ display: 'flex', flexDirection: 'column', gap: 2, mt: 3 }}
+      >
+        {error && <Text tone="negative">{error}</Text>}
+        <TextField
+          label="Email"
+          type="email"
+          value={email}
+          onChange={(e) => setEmail(e.target.value)}
+          required
+          placeholder="email@example.com"
+        />
+        <TextField
+          label="Пароль"
+          type="password"
+          value={password}
+          onChange={(e) => setPassword(e.target.value)}
+          required
+          placeholder="••••••••"
+        />
+        <Button type="submit" loading={loading}>
+          Войти
+        </Button>
+        <Text tone="secondary" style={{ textAlign: 'center' }}>
           Нет аккаунта?{' '}
           <Link
             to={`/register${redirect !== '/' ? `?redirect=${encodeURIComponent(redirect)}` : ''}`}
-            style={{ color: 'var(--color-primary)' }}
           >
             Зарегистрироваться
           </Link>
-        </p>
-      </form>
-    </div>
+        </Text>
+      </Box>
+    </Box>
   );
 }
-
-const inputStyle: React.CSSProperties = {
-  width: '100%',
-  padding: '10px 12px',
-  border: '1px solid #e0e0e0',
-  borderRadius: 'var(--border-radius)',
-  fontSize: 16,
-  outline: 'none',
-  boxSizing: 'border-box',
-};
-
-const buttonStyle: React.CSSProperties = {
-  padding: '12px 24px',
-  background: 'var(--color-primary)',
-  color: '#fff',
-  border: 'none',
-  borderRadius: 'var(--border-radius)',
-  fontSize: 16,
-  fontWeight: 600,
-  cursor: 'pointer',
-};

apps/frontend/src/pages/profile/ProfilePage.test.tsx

@@ -1,5 +1,5 @@
 import { describe, it, expect } from 'vitest';
-import { screen } from '@testing-library/react';
+import { screen, waitFor } from '@testing-library/react';
 import userEvent from '@testing-library/user-event';
 import { http, HttpResponse } from 'msw';
 import { server } from '@/shared/lib/test/server';
@@ -57,6 +57,8 @@ describe('ProfilePage', () => {
     await user.type(input, 'New Name');
     await user.click(screen.getByRole('button', { name: 'Сохранить' }));
 
-    expect(await screen.findByText('Сохранение...')).toBeInTheDocument();
+    await waitFor(() => {
+      expect(screen.getByRole('button', { name: 'Сохранить' })).toBeDisabled();
+    });
   });
 });

apps/frontend/src/pages/profile/ui/ProfilePage.tsx

@@ -1,4 +1,6 @@
 import { useState, type FormEvent } from 'react';
+import { Box } from '@mui/material';
+import { Button, Heading, Surface, Text, TextField } from '@moex-vibe/design-system';
 import { useSession } from '@/entities/session';
 
 export function ProfilePage() {
@@ -24,82 +26,37 @@ export function ProfilePage() {
   if (!user) return null;
 
   return (
-    <div style={{ maxWidth: 500, margin: '40px auto' }}>
-      <h1 style={{ marginBottom: 24, fontSize: 24, fontWeight: 700 }}>Профиль</h1>
-      <div
-        style={{
-          background: 'var(--color-surface)',
-          borderRadius: 'var(--border-radius)',
-          boxShadow: 'var(--shadow)',
-          padding: 24,
-        }}
-      >
-        <div style={{ marginBottom: 16 }}>
-          <span style={{ fontSize: 14, color: 'var(--color-text-secondary)' }}>Почта</span>
-          <p style={{ fontSize: 16, fontWeight: 500 }}>{user.email}</p>
-        </div>
-        <div style={{ marginBottom: 16 }}>
-          <span style={{ fontSize: 14, color: 'var(--color-text-secondary)' }}>Роль</span>
-          <p style={{ fontSize: 16, fontWeight: 500 }}>{user.role}</p>
-        </div>
-        <form onSubmit={handleSubmit} style={{ display: 'flex', flexDirection: 'column', gap: 12 }}>
-          <div>
-            <label
-              style={{
-                display: 'block',
-                marginBottom: 4,
-                fontSize: 14,
-                color: 'var(--color-text-secondary)',
-              }}
-            >
-              Имя
-            </label>
-            <input
-              value={name}
-              onChange={(e) => setName(e.target.value)}
-              style={{
-                width: '100%',
-                padding: '10px 12px',
-                border: '1px solid #e0e0e0',
-                borderRadius: 'var(--border-radius)',
-                fontSize: 16,
-                outline: 'none',
-                boxSizing: 'border-box',
-              }}
-            />
-          </div>
+    <Box maxWidth={500} mx="auto" mt={5}>
+      <Heading level={1} size="title">
+        Профиль
+      </Heading>
+      <Surface elevation="sm" padding="md">
+        <Box sx={{ mb: 2 }}>
+          <Text variant="label" tone="secondary">
+            Почта
+          </Text>
+          <Text>{user.email}</Text>
+        </Box>
+        <Box sx={{ mb: 2 }}>
+          <Text variant="label" tone="secondary">
+            Роль
+          </Text>
+          <Text>{user.role}</Text>
+        </Box>
+        <Box
+          component="form"
+          onSubmit={handleSubmit}
+          sx={{ display: 'flex', flexDirection: 'column', gap: 1.5 }}
+        >
+          <TextField label="Имя" value={name} onChange={(e) => setName(e.target.value)} />
           {message && (
-            <div
-              style={{
-                fontSize: 14,
-                color:
-                  message === 'Профиль обновлён'
-                    ? 'var(--color-positive)'
-                    : 'var(--color-negative)',
-              }}
-            >
-              {message}
-            </div>
+            <Text tone={message === 'Профиль обновлён' ? 'positive' : 'negative'}>{message}</Text>
           )}
-          <button
-            type="submit"
-            disabled={saving}
-            style={{
-              padding: '10px 20px',
-              background: 'var(--color-primary)',
-              color: '#fff',
-              border: 'none',
-              borderRadius: 'var(--border-radius)',
-              fontSize: 14,
-              fontWeight: 600,
-              cursor: 'pointer',
-              alignSelf: 'flex-start',
-            }}
-          >
-            {saving ? 'Сохранение...' : 'Сохранить'}
-          </button>
-        </form>
-      </div>
-    </div>
+          <Button type="submit" loading={saving} variant="primary">
+            Сохранить
+          </Button>
+        </Box>
+      </Surface>
+    </Box>
   );
 }

apps/frontend/src/pages/register/ui/RegisterPage.tsx

@@ -1,5 +1,7 @@
 import { useState, type FormEvent } from 'react';
 import { Link, useNavigate, useSearchParams } from 'react-router-dom';
+import { Box } from '@mui/material';
+import { Button, Heading, Text, TextField } from '@moex-vibe/design-system';
 import { useSession } from '@/entities/session';
 
 export function RegisterPage() {
@@ -36,124 +38,57 @@ export function RegisterPage() {
   }
 
   return (
-    <div style={{ maxWidth: 400, margin: '60px auto' }}>
-      <h1 style={{ marginBottom: 24, fontSize: 24, fontWeight: 700 }}>Регистрация</h1>
-      <form onSubmit={handleSubmit} style={{ display: 'flex', flexDirection: 'column', gap: 16 }}>
-        {error && <div style={{ color: 'var(--color-negative)', fontSize: 14 }}>{error}</div>}
-        <div>
-          <label
-            style={{
-              display: 'block',
-              marginBottom: 4,
-              fontSize: 14,
-              color: 'var(--color-text-secondary)',
-            }}
-          >
-            Имя (необязательно)
-          </label>
-          <input
-            type="text"
-            value={name}
-            onChange={(e) => setName(e.target.value)}
-            style={inputStyle}
-            placeholder="Иван Иванов"
-          />
-        </div>
-        <div>
-          <label
-            style={{
-              display: 'block',
-              marginBottom: 4,
-              fontSize: 14,
-              color: 'var(--color-text-secondary)',
-            }}
-          >
-            Email
-          </label>
-          <input
-            type="email"
-            value={email}
-            onChange={(e) => setEmail(e.target.value)}
-            required
-            style={inputStyle}
-            placeholder="email@example.com"
-          />
-        </div>
-        <div>
-          <label
-            style={{
-              display: 'block',
-              marginBottom: 4,
-              fontSize: 14,
-              color: 'var(--color-text-secondary)',
-            }}
-          >
-            Пароль
-          </label>
-          <input
-            type="password"
-            value={password}
-            onChange={(e) => setPassword(e.target.value)}
-            required
-            minLength={6}
-            style={inputStyle}
-            placeholder="Минимум 6 символов"
-          />
-        </div>
-        <div>
-          <label
-            style={{
-              display: 'block',
-              marginBottom: 4,
-              fontSize: 14,
-              color: 'var(--color-text-secondary)',
-            }}
-          >
-            Подтверждение пароля
-          </label>
-          <input
-            type="password"
-            value={confirmPassword}
-            onChange={(e) => setConfirmPassword(e.target.value)}
-            required
-            style={inputStyle}
-            placeholder="Повторите пароль"
-          />
-        </div>
-        <button type="submit" disabled={loading} style={buttonStyle}>
-          {loading ? 'Регистрация...' : 'Зарегистрироваться'}
-        </button>
-        <p style={{ textAlign: 'center', fontSize: 14, color: 'var(--color-text-secondary)' }}>
+    <Box maxWidth={400} mx="auto" mt={7.5}>
+      <Heading level={1} size="title">
+        Регистрация
+      </Heading>
+      <Box
+        component="form"
+        onSubmit={handleSubmit}
+        sx={{ display: 'flex', flexDirection: 'column', gap: 2, mt: 3 }}
+      >
+        {error && <Text tone="negative">{error}</Text>}
+        <TextField
+          label="Имя (необязательно)"
+          value={name}
+          onChange={(e) => setName(e.target.value)}
+          placeholder="Иван Иванов"
+        />
+        <TextField
+          label="Email"
+          type="email"
+          value={email}
+          onChange={(e) => setEmail(e.target.value)}
+          required
+          placeholder="email@example.com"
+        />
+        <TextField
+          label="Пароль"
+          type="password"
+          value={password}
+          onChange={(e) => setPassword(e.target.value)}
+          required
+          placeholder="Минимум 6 символов"
+          slotProps={{ htmlInput: { minLength: 6 } }}
+        />
+        <TextField
+          label="Подтверждение пароля"
+          type="password"
+          value={confirmPassword}
+          onChange={(e) => setConfirmPassword(e.target.value)}
+          required
+          placeholder="Повторите пароль"
+        />
+        <Button type="submit" loading={loading}>
+          Зарегистрироваться
+        </Button>
+        <Text tone="secondary" style={{ textAlign: 'center' }}>
           Уже есть аккаунт?{' '}
-          <Link
-            to={`/login${redirect !== '/' ? `?redirect=${encodeURIComponent(redirect)}` : ''}`}
-            style={{ color: 'var(--color-primary)' }}
-          >
+          <Link to={`/login${redirect !== '/' ? `?redirect=${encodeURIComponent(redirect)}` : ''}`}>
             Войти
           </Link>
-        </p>
-      </form>
-    </div>
+        </Text>
+      </Box>
+    </Box>
   );
 }
-
-const inputStyle: React.CSSProperties = {
-  width: '100%',
-  padding: '10px 12px',
-  border: '1px solid #e0e0e0',
-  borderRadius: 'var(--border-radius)',
-  fontSize: 16,
-  outline: 'none',
-  boxSizing: 'border-box',
-};
-
-const buttonStyle: React.CSSProperties = {
-  padding: '12px 24px',
-  background: 'var(--color-primary)',
-  color: '#fff',
-  border: 'none',
-  borderRadius: 'var(--border-radius)',
-  fontSize: 16,
-  fontWeight: 600,
-  cursor: 'pointer',
-};