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+# Yandex ID + VK ID OAuth — Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Add Yandex and VK OAuth login buttons to the client, enrich user profiles with firstName/lastName/gender/avatar from OAuth providers, and rename `name` → `displayName` across the project.
+
+**Architecture:** Server OAuth flow already exists (`oauth-social.js`). We update the User model (rename `name`→`displayName`, add 4 fields), enrich `findOrCreateUserFromOAuth()` to save profile data, then add an FSD feature `features/auth-oauth/` with Yandex/VK login buttons on the AuthPage.
+
+**Tech Stack:** Prisma (SQLite), Fastify, React + MUI + Effector + TypeScript
+
+---
+
+### Task 1: Update Prisma User model
+
+**Files:**
+- Modify: `server/prisma/schema.prisma:80`
+
+- [ ] **Step 1: Rename `name` → `displayName` and add new fields**
+
+```diff
+ model User {
+   id           String   @id @default(cuid())
+   email        String   @unique
+-  name         String?
++  displayName  String?
++  firstName    String?
++  lastName     String?
++  gender       String?
++  avatar       String?
+   phone        String?
+   passwordHash String?
+   createdAt    DateTime @default(now())
+   updatedAt    DateTime @updatedAt
+
+   codes AuthCode[]
+   addresses ShippingAddress[]
+   cartItems CartItem[]
+   orders Order[]
+   reviews Review[]
+   orderMessageReadStates UserOrderMessageReadState[]
+   oauthAccounts OAuthAccount[]
+   notificationPreference NotificationPreference?
+   notificationLogs NotificationLog[]
+ }
+```
+
+- [ ] **Step 2: Reset DB to apply schema change**
+
+```bash
+cd server && npm run db:reset:test
+```
+
+Expected: "Your database has been reset" or similar. Migration runs and seed applies.
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add server/prisma/schema.prisma
+git commit -m "feat: rename User.name→displayName, add firstName/lastName/gender/avatar"
+```
+
+---
+
+### Task 2: Update server `mapUserForClient` and profile handler in auth.js
+
+**Files:**
+- Modify: `server/src/routes/auth.js:5-15`
+- Modify: `server/src/routes/auth.js:116-138`
+
+- [ ] **Step 1: Update `mapUserForClient` to use `displayName` and add new fields**
+
+Replace lines 5-15 with:
+
+```js
+function mapUserForClient(user) {
+  const adminEmail = normalizeEmail(process.env.ADMIN_EMAIL)
+  const userEmail = normalizeEmail(user.email)
+  return {
+    id: user.id,
+    email: user.email,
+    displayName: user.displayName,
+    firstName: user.firstName,
+    lastName: user.lastName,
+    gender: user.gender,
+    avatar: user.avatar,
+    phone: user.phone,
+    isAdmin: Boolean(adminEmail) && userEmail === adminEmail,
+  }
+}
+```
+
+- [ ] **Step 2: Update `PATCH /api/me/profile` to use `displayName`**
+
+Replace lines 114-138 with:
+
+```js
+  fastify.patch('/api/me/profile', { preHandler: [fastify.authenticate] }, async (request, reply) => {
+    const userId = request.user.sub
+    const nameRaw = request.body?.displayName
+    const displayName = nameRaw === null || nameRaw === undefined ? null : String(nameRaw).trim()
+    const phoneRaw = request.body?.phone
+    const phone = phoneRaw === null || phoneRaw === undefined ? null : String(phoneRaw).trim()
+
+    if (displayName !== null && displayName.length > 40) return reply.code(400).send({ error: 'Имя/ник максимум 40 символов' })
+    if (phone !== null) {
+      const compact = phone.replace(/[\s()-]/g, '')
+      if (compact.length > 20) return reply.code(400).send({ error: 'Телефон слишком длинный' })
+      if (compact.length && !/^\+?\d{7,20}$/.test(compact)) {
+        return reply.code(400).send({ error: 'Некорректный телефон' })
+      }
+    }
+
+    const updated = await prisma.user.update({
+      where: { id: userId },
+      data: {
+        displayName: displayName && displayName.length ? displayName : null,
+        phone: phone && phone.length ? phone : null,
+      },
+    })
+    return { user: mapUserForClient(updated) }
+  })
+```
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add server/src/routes/auth.js
+git commit -m "feat: use displayName in mapUserForClient and profile update"
+```
+
+---
+
+### Task 3: Update admin-users.js — rename `name` → `displayName`
+
+**Files:**
+- Modify: `server/src/routes/api/admin-users.js`
+
+- [ ] **Step 1: Replace all `name` → `displayName` throughout**
+
+Replace line 24 (`OR` clause):
+```
+          OR: [{ email: { contains: q } }, { displayName: { contains: q } }],
+```
+
+Replace line 35 (select):
+```
+        displayName: true,
+```
+
+Replace line 46 (map):
+```
+      displayName: u.displayName,
+```
+
+Replace lines 63-64 (create — body field and validation):
+```
+    const nameRaw = body.displayName
+    const displayName = nameRaw === null || nameRaw === undefined ? null : String(nameRaw).trim()
+    if (displayName !== null && displayName.length > 40) {
+```
+
+Replace line 79 (create data):
+```
+        displayName: displayName && displayName.length ? displayName : null,
+```
+
+Replace line 86 (create response):
+```
+      displayName: user.displayName,
+```
+
+Replace lines 120-127 (update):
+```
+    if (body.displayName !== undefined) {
+      const nameRaw = body.displayName
+      const name = nameRaw === null || nameRaw === undefined ? null : String(nameRaw).trim()
+      if (name !== null && name.length > 40) {
+        reply.code(400).send({ error: 'Имя/ник максимум 40 символов' })
+        return
+      }
+      data.displayName = name && name.length ? name : null
+    }
+```
+
+Replace line 134 (update response):
+```
+      displayName: user.displayName,
+```
+
+- [ ] **Step 2: Commit**
+
+```bash
+git add server/src/routes/api/admin-users.js
+git commit -m "refactor: rename name→displayName in admin-users"
+```
+
+---
+
+### Task 4: Update admin-reviews.js and review-display.js — rename `name` → `displayName`
+
+**Files:**
+- Modify: `server/src/routes/api/admin-reviews.js:59`
+- Modify: `server/src/lib/review-display.js:4`
+
+- [ ] **Step 1: Update admin-reviews.js line 59**
+
+Replace:
+```
+      userName: existing.user?.name || existing.user?.email || '',
+```
+With:
+```
+      userName: existing.user?.displayName || existing.user?.email || '',
+```
+
+- [ ] **Step 2: Update review-display.js line 4**
+
+Replace:
+```
+  const name = typeof user.name === 'string' ? user.name.trim() : ''
+```
+With:
+```
+  const name = typeof user.displayName === 'string' ? user.displayName.trim() : ''
+```
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add server/src/routes/api/admin-reviews.js server/src/lib/review-display.js
+git commit -m "refactor: rename name→displayName in review files"
+```
+
+---
+
+### Task 5: Enrich VK OAuth — save firstName, lastName, gender, avatar
+
+**Files:**
+- Modify: `server/src/routes/oauth-social.js:119-152`
+
+- [ ] **Step 1: Update VK to fetch `photo_200` instead of `photo_50`, extract sex, and save all new fields**
+
+Replace lines 119-152 with:
+
+```js
+    let firstName = null
+    let lastName = null
+    let gender = null
+    let avatar = null
+    try {
+      if (accessTokenVk && vkUserId) {
+        const u = new URL('https://api.vk.com/method/users.get')
+        u.searchParams.set('access_token', accessTokenVk)
+        u.searchParams.set('users_ids', String(vkUserId))
+        u.searchParams.set('fields', 'photo_200,sex')
+        u.searchParams.set('v', '5.199')
+        const profRes = await fetch(u.toString())
+        const prof = await profRes.json()
+        const u0 = prof?.response?.[0]
+        if (u0) {
+          firstName = u0.first_name ?? null
+          lastName = u0.last_name ?? null
+          avatar = u0.photo_200 ?? null
+          if (u0.sex === 1) gender = 'female'
+          else if (u0.sex === 2) gender = 'male'
+        }
+      }
+    } catch {
+      // ignore profile extras
+    }
+
+    const user = await findOrCreateUserFromOAuth({
+      provider: 'vk',
+      providerUserId: String(vkUserId),
+      accessToken: accessTokenVk ?? null,
+      suggestedEmail: emailSuggestion,
+    })
+
+    const displayName = [firstName, lastName].filter(Boolean).join(' ').trim()
+    const updateData = {}
+    if (displayName && !user.displayName) updateData.displayName = displayName
+    if (firstName) updateData.firstName = firstName
+    if (lastName) updateData.lastName = lastName
+    if (gender) updateData.gender = gender
+    if (avatar) updateData.avatar = avatar
+    if (Object.keys(updateData).length > 0) {
+      await prisma.user.update({ where: { id: user.id }, data: updateData })
+    }
+```
+
+- [ ] **Step 2: Commit**
+
+```bash
+git add server/src/routes/oauth-social.js
+git commit -m "feat: enrich VK OAuth with firstName/lastName/gender/avatar"
+```
+
+---
+
+### Task 6: Enrich Yandex OAuth — save firstName, lastName, gender, avatar
+
+**Files:**
+- Modify: `server/src/routes/oauth-social.js:229-243`
+
+- [ ] **Step 1: Update Yandex to extract and save all new fields**
+
+Replace lines 229-243 (from `const user = await findOrCreateUserFromOAuth(...)` to the end of the Yandex callback) with:
+
+```js
+    const user = await findOrCreateUserFromOAuth({
+      provider: 'yandex',
+      providerUserId: yaUserId,
+      accessToken: yaToken,
+      suggestedEmail: emailGuess || null,
+    })
+
+    const updateData = {}
+    const displayName = [info.first_name, info.last_name].filter(Boolean).join(' ').trim() || info.display_name || info.real_name
+    if (displayName && !user.displayName) updateData.displayName = displayName
+    if (info.first_name) updateData.firstName = info.first_name
+    if (info.last_name) updateData.lastName = info.last_name
+    if (info.sex === 'male' || info.sex === 'female') updateData.gender = info.sex
+    if (info.default_avatar_id && !info.is_avatar_empty) {
+      updateData.avatar = `https://avatars.yandex.net/get-yapic/${info.default_avatar_id}/islands-200`
+    }
+    if (Object.keys(updateData).length > 0) {
+      await prisma.user.update({ where: { id: user.id }, data: updateData })
+    }
+```
+
+- [ ] **Step 2: Commit**
+
+```bash
+git add server/src/routes/oauth-social.js
+git commit -m "feat: enrich Yandex OAuth with firstName/lastName/gender/avatar"
+```
+
+---
+
+### Task 7: Update client `AuthUser` type and `UpdateProfileParams`
+
+**Files:**
+- Modify: `client/src/shared/model/auth.ts:6`
+- Modify: `client/src/shared/model/auth.ts:61`
+
+- [ ] **Step 1: Update `AuthUser` type**
+
+Replace line 6:
+```
+export type AuthUser = { id: string; email: string; name?: string | null; phone?: string | null; isAdmin?: boolean }
+```
+With:
+```ts
+export type AuthUser = {
+  id: string
+  email: string
+  displayName?: string | null
+  firstName?: string | null
+  lastName?: string | null
+  gender?: string | null
+  avatar?: string | null
+  phone?: string | null
+  isAdmin?: boolean
+}
+```
+
+- [ ] **Step 2: Update `UpdateProfileParams`**
+
+Replace line 61:
+```
+export type UpdateProfileParams = { name: string | null; phone?: string | null }
+```
+With:
+```ts
+export type UpdateProfileParams = { displayName: string | null; phone?: string | null }
+```
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add client/src/shared/model/auth.ts
+git commit -m "refactor: rename name→displayName in AuthUser type"
+```
+
+---
+
+### Task 8: Update client files — rename `name` → `displayName`
+
+**Files:**
+- Modify: `client/src/pages/auth/ui/AuthPage.tsx:15`
+- Modify: `client/src/pages/me/ui/MeLayoutPage.tsx:84`
+- Modify: `client/src/features/user/user-menu/ui/UserMenu.tsx:57`
+- Modify: `client/src/pages/me/ui/MePage.tsx:41-91`
+- Modify: `client/src/pages/me/ui/sections/SettingsPage.tsx:41-98`
+- Modify: `client/src/entities/order/api/admin-order-api.ts:40`
+- Modify: `client/src/entities/review/api/admin-review-api.ts:10`
+
+- [ ] **Step 1: Update AuthPage inline type**
+
+Replace `client/src/pages/auth/ui/AuthPage.tsx` line 15:
+```
+type AuthResponse = { token: string; user: { id: string; email: string; name?: string | null; phone?: string | null } }
+```
+With:
+```ts
+type AuthResponse = { token: string; user: { id: string; email: string; displayName?: string | null; phone?: string | null } }
+```
+
+- [ ] **Step 2: Update MeLayoutPage**
+
+Replace `client/src/pages/me/ui/MeLayoutPage.tsx` line 84:
+```
+          {user.name?.trim() || user.email}
+```
+With:
+```
+          {user.displayName?.trim() || user.email}
+```
+
+- [ ] **Step 3: Update UserMenu**
+
+Replace `client/src/features/user/user-menu/ui/UserMenu.tsx` line 57:
+```
+              <ListItemText primary={(user.name && user.name.trim()) || user.email} secondary="Профиль" />
+```
+With:
+```
+              <ListItemText primary={(user.displayName && user.displayName.trim()) || user.email} secondary="Профиль" />
+```
+
+- [ ] **Step 4: Update MePage (profile page)**
+
+Replace `client/src/pages/me/ui/MePage.tsx` — the form field name and all related code:
+
+Line 41 — form type:
+```
+  const profileForm = useForm<{ displayName: string }>({
+```
+
+Line 42 — defaultValues:
+```
+    defaultValues: { displayName: user?.displayName ? String(user.displayName) : '' },
+```
+
+Line 79-83 — TextField:
+```
+            <TextField
+              label="Имя или ник"
+              helperText="До 40 символов"
+              slotProps={{ htmlInput: { maxLength: 40 } }}
+              {...profileForm.register('displayName')}
+            />
+```
+
+Lines 88-91 — onClick:
+```
+              onClick={() => {
+                const raw = profileForm.getValues('displayName')
+                const name = raw.trim()
+                updateProfileFx({ displayName: name.length ? name : null })
+              }}
+```
+
+- [ ] **Step 5: Update SettingsPage**
+
+Replace `client/src/pages/me/ui/sections/SettingsPage.tsx` — same pattern as MePage:
+
+Line 41 — form type:
+```
+  const profileForm = useForm<{ displayName: string; phone: string }>({
+```
+
+Line 42 — defaultValues:
+```
+    defaultValues: { displayName: user?.displayName ? String(user.displayName) : '', phone: user?.phone ? String(user.phone) : '' },
+```
+
+Lines 79-83 — TextField:
+```
+            <TextField
+              label="Имя или ник"
+              helperText="До 40 символов"
+              slotProps={{ htmlInput: { maxLength: 40 } }}
+              {...profileForm.register('displayName')}
+            />
+```
+
+Lines 93-98 — onClick:
+```
+              onClick={() => {
+                const raw = profileForm.getValues('displayName')
+                const name = raw.trim()
+                const phoneRaw = profileForm.getValues('phone')
+                const phone = phoneRaw.trim()
+                updateProfileFx({ displayName: name.length ? name : null, phone: phone.length ? phone : null })
+              }}
+```
+
+- [ ] **Step 6: Update admin-order-api.ts type**
+
+Replace `client/src/entities/order/api/admin-order-api.ts` line 40:
+```
+    user: { id: string; email: string; name: string | null; phone: string | null }
+```
+With:
+```ts
+    user: { id: string; email: string; displayName: string | null; phone: string | null }
+```
+
+- [ ] **Step 7: Update admin-review-api.ts type**
+
+Replace `client/src/entities/review/api/admin-review-api.ts` line 10:
+```
+  user: { id: string; email: string; name: string | null }
+```
+With:
+```ts
+  user: { id: string; email: string; displayName: string | null }
+```
+
+- [ ] **Step 8: Run client lint to verify**
+
+```bash
+cd client && npm run lint
+```
+
+Expected: no errors (or fix any found).
+
+- [ ] **Step 9: Commit**
+
+```bash
+git add client/src/pages/auth/ui/AuthPage.tsx client/src/pages/me/ui/MeLayoutPage.tsx client/src/features/user/user-menu/ui/UserMenu.tsx client/src/pages/me/ui/MePage.tsx client/src/pages/me/ui/sections/SettingsPage.tsx client/src/entities/order/api/admin-order-api.ts client/src/entities/review/api/admin-review-api.ts
+git commit -m "refactor: rename name→displayName across client"
+```
+
+---
+
+### Task 9: Create OAuth providers config
+
+**Files:**
+- Create: `client/src/features/auth-oauth/lib/oauth-providers.ts`
+
+- [ ] **Step 1: Create the providers config**
+
+```ts
+import { oauthAuthorizeUrl } from '@/shared/lib/oauth-authorize-url'
+
+export type OAuthProvider = {
+  id: 'yandex' | 'vk'
+  label: string
+  color: string
+}
+
+export const oauthProviders: OAuthProvider[] = [
+  {
+    id: 'yandex',
+    label: 'Яндекс ID',
+    color: '#FC3F1D',
+  },
+  {
+    id: 'vk',
+    label: 'VK ID',
+    color: '#0077FF',
+  },
+]
+
+export function getOAuthUrl(provider: 'yandex' | 'vk'): string {
+  return oauthAuthorizeUrl(provider)
+}
+```
+
+- [ ] **Step 2: Commit**
+
+```bash
+git add client/src/features/auth-oauth/lib/oauth-providers.ts
+git commit -m "feat: add oauth providers config"
+```
+
+---
+
+### Task 10: Create OAuthButtons component
+
+**Files:**
+- Create: `client/src/features/auth-oauth/ui/OAuthButtons.tsx`
+
+- [ ] **Step 1: Create the OAuthButtons component**
+
+```tsx
+import Stack from '@mui/material/Stack'
+import Button from '@mui/material/Button'
+import { getOAuthUrl, oauthProviders } from '../lib/oauth-providers'
+
+export function OAuthButtons() {
+  return (
+    <Stack direction="row" spacing={1} justifyContent="center">
+      {oauthProviders.map((p) => (
+        <Button
+          key={p.id}
+          variant="outlined"
+          href={getOAuthUrl(p.id)}
+          sx={{
+            borderColor: p.color,
+            color: p.color,
+            '&:hover': {
+              borderColor: p.color,
+              bgcolor: `${p.color}14`,
+            },
+          }}
+        >
+          Войти через {p.label}
+        </Button>
+      ))}
+    </Stack>
+  )
+}
+```
+
+- [ ] **Step 2: Create barrel export**
+
+Create `client/src/features/auth-oauth/index.ts`:
+
+```ts
+export { OAuthButtons } from './ui/OAuthButtons'
+```
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add client/src/features/auth-oauth/
+git commit -m "feat: add OAuthButtons component"
+```
+
+---
+
+### Task 11: Integrate OAuthButtons into AuthPage
+
+**Files:**
+- Modify: `client/src/pages/auth/ui/AuthPage.tsx`
+
+- [ ] **Step 1: Add import and component after the email-code form**
+
+Add import at top (after existing imports):
+```ts
+import { OAuthButtons } from '@/features/auth-oauth'
+```
+
+Add MUI Divider import (add to existing MUI imports):
+```
+import Divider from '@mui/material/Divider'
+```
+
+After the closing `</Stack>` on line 110, before the closing `</Box>` on line 111, add:
+
+```tsx
+        <Divider sx={{ my: 2 }}>или</Divider>
+
+        <OAuthButtons />
+```
+
+So the structure becomes:
+
+```tsx
+      <Stack spacing={2} sx={{ maxWidth: 520 }}>
+        {/* ... existing email/code form ... */}
+        <Stack direction={{ xs: 'column', sm: 'row' }} spacing={2}>
+          {/* ... buttons ... */}
+        </Stack>
+      </Stack>
+
+      <Stack sx={{ maxWidth: 520 }}>
+        <Divider sx={{ my: 2 }}>или</Divider>
+
+        <OAuthButtons />
+      </Stack>
+```
+
+- [ ] **Step 2: Run client lint**
+
+```bash
+cd client && npm run lint
+```
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add client/src/pages/auth/ui/AuthPage.tsx
+git commit -m "feat: add OAuth buttons to AuthPage"
+```
+
+---
+
+### Task 12: Update server .env.example
+
+**Files:**
+- Modify: `server/.env.example:28-30`
+
+- [ ] **Step 1: Add scope documentation**
+
+Replace lines 28-30:
+```
+# Yandex OAuth: redirect URI = SERVER_PUBLIC_URL + /api/auth/oauth/yandex/callback
+YANDEX_CLIENT_ID=
+YANDEX_CLIENT_SECRET=
+```
+With:
+```env
+# Yandex OAuth: redirect URI = SERVER_PUBLIC_URL + /api/auth/oauth/yandex/callback
+# Scopes: login:email login:info
+YANDEX_CLIENT_ID=
+YANDEX_CLIENT_SECRET=
+```
+
+- [ ] **Step 2: Commit**
+
+```bash
+git add server/.env.example
+git commit -m "docs: add Yandex OAuth scopes to .env.example"
+```
+
+---
+
+### Task 13: Write server tests for OAuth profile enrichment
+
+**Files:**
+- Create: `server/src/routes/__tests__/oauth-social.test.js`
+
+- [ ] **Step 1: Create test file**
+
+```js
+import { describe, it, expect, beforeAll, afterAll } from 'vitest'
+import { prisma } from '../../lib/prisma.js'
+
+describe('OAuth — findOrCreateUserFromOAuth (indirect via DB checks)', () => {
+  it('stores displayName, firstName, lastName, gender, avatar fields on User model', async () => {
+    // Verify new fields exist on the schema by creating a user with them
+    const user = await prisma.user.create({
+      data: {
+        email: 'test-oauth@example.com',
+        displayName: 'Test User',
+        firstName: 'Test',
+        lastName: 'User',
+        gender: 'male',
+        avatar: 'https://example.com/avatar.jpg',
+      },
+    })
+
+    expect(user.displayName).toBe('Test User')
+    expect(user.firstName).toBe('Test')
+    expect(user.lastName).toBe('User')
+    expect(user.gender).toBe('male')
+    expect(user.avatar).toBe('https://example.com/avatar.jpg')
+
+    // Cleanup
+    await prisma.user.delete({ where: { id: user.id } })
+  })
+
+  it('allows nullable fields', async () => {
+    const user = await prisma.user.create({
+      data: {
+        email: 'test-oauth-null@example.com',
+      },
+    })
+
+    expect(user.displayName).toBeNull()
+    expect(user.firstName).toBeNull()
+    expect(user.lastName).toBeNull()
+    expect(user.gender).toBeNull()
+    expect(user.avatar).toBeNull()
+
+    await prisma.user.delete({ where: { id: user.id } })
+  })
+})
+```
+
+- [ ] **Step 2: Run server tests**
+
+```bash
+cd server && npm test
+```
+
+Expected: 2 passing tests.
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add server/src/routes/__tests__/oauth-social.test.js
+git commit -m "test: OAuth user model fields"
+```
+
+---
+
+### Task 14: Write client test for OAuthButtons
+
+**Files:**
+- Create: `client/src/features/auth-oauth/__tests__/OAuthButtons.test.tsx`
+
+- [ ] **Step 1: Create test file**
+
+```tsx
+import { describe, it, expect } from 'vitest'
+import { render, screen } from '@testing-library/react'
+import { OAuthButtons } from '../ui/OAuthButtons'
+
+describe('OAuthButtons', () => {
+  it('renders Yandex and VK buttons', () => {
+    render(<OAuthButtons />)
+    expect(screen.getByText('Войти через Яндекс ID')).toBeDefined()
+    expect(screen.getByText('Войти через VK ID')).toBeDefined()
+  })
+
+  it('buttons have correct href', () => {
+    render(<OAuthButtons />)
+    const yaBtn = screen.getByText('Войти через Яндекс ID').closest('a')
+    const vkBtn = screen.getByText('Войти через VK ID').closest('a')
+    expect(yaBtn?.getAttribute('href')).toContain('/auth/oauth/yandex')
+    expect(vkBtn?.getAttribute('href')).toContain('/auth/oauth/vk')
+  })
+})
+```
+
+- [ ] **Step 2: Run client tests**
+
+```bash
+cd client && npm test
+```
+
+Expected: 2 passing tests.
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add client/src/features/auth-oauth/__tests__/OAuthButtons.test.tsx
+git commit -m "test: OAuthButtons component"
+```
+
+---
+
+### Task 15: Final verification — full build and lint
+
+**Files:** none (verification only)
+
+- [ ] **Step 1: Run server lint**
+
+```bash
+cd server && npm run lint
+```
+
+Expected: no errors.
+
+- [ ] **Step 2: Run server tests**
+
+```bash
+cd server && npm test
+```
+
+Expected: all tests pass.
+
+- [ ] **Step 3: Run client lint + format check**
+
+```bash
+cd client && npm run lint && npm run format:check
+```
+
+Expected: no errors.
+
+- [ ] **Step 4: Run client tests**
+
+```bash
+cd client && npm test
+```
+
+Expected: all tests pass.
+
+- [ ] **Step 5: Run client build (full typecheck)**
+
+```bash
+cd client && npm run build
+```
+
+Expected: build succeeds with no TypeScript errors.
+
+- [ ] **Step 6: Final commit (if any fixups were needed)**
+
+```bash
+git add -A && git commit -m "chore: final verification fixes" || echo "No fixups needed"
+```