fix(Task 2): add error handling and sync state with user

- AuthMethodsSection: show Alert on fetchAuthMethodsFx failure
- AvatarSection: sync selectedStyle with user.avatarStyle via Select key
- ProfileSection: reset form defaultValues when user.displayName changes

client/src/pages/me/ui/sections/AuthMethodsSection.tsx

@@ -1,4 +1,5 @@
 import { useCallback, useEffect, useState } from 'react'
+import Alert from '@mui/material/Alert'
 import Box from '@mui/material/Box'
 import Button from '@mui/material/Button'
 import Chip from '@mui/material/Chip'
@@ -24,6 +25,7 @@ export function AuthMethodsSection() {
 
   const [authMethods, setAuthMethods] = useState<AuthMethod[]>([])
   const [showSetPassword, setShowSetPassword] = useState(false)
+  const [fetchError, setFetchError] = useState<string | null>(null)
   const passwordForm = useForm<{ password: string; passwordConfirm: string }>({
     defaultValues: { password: '', passwordConfirm: '' },
   })
@@ -31,8 +33,9 @@ export function AuthMethodsSection() {
   useEffect(() => {
     fetchAuthMethodsFx()
       .then(setAuthMethods)
-      .catch(() => {
+      .catch((err) => {
         setAuthMethods([])
+        setFetchError(err?.message || 'Не удалось загрузить методы авторизации')
       })
   }, [])
 
@@ -81,6 +84,11 @@ export function AuthMethodsSection() {
       <Typography variant="h6" gutterBottom>
         Методы входа
       </Typography>
+      {fetchError && (
+        <Alert severity="error" sx={{ mb: 2 }}>
+          {fetchError}
+        </Alert>
+      )}
       <Stack spacing={1}>
         {authMethods.map((m) => (
           <Stack key={m.type} direction="row" spacing={2} sx={{ alignItems: 'center' }}>