fix(auth): add forgot password flow and fix OAuth URL clearing

client/src/pages/auth/ui/AuthPage.tsx

@@ -9,6 +9,7 @@ import Typography from '@mui/material/Typography'
 import { useUnit } from 'effector-react'
 import { useNavigate, useSearchParams } from 'react-router-dom'
 import { AuthCodeForm } from '@/features/auth-code'
+import { AuthForgotForm } from '@/features/auth-forgot'
 import { OAuthButtons } from '@/features/auth-oauth'
 import { AuthPasswordForm } from '@/features/auth-password'
 import { $user } from '@/shared/model/auth'
@@ -19,6 +20,7 @@ export function AuthPage() {
   const [message, setMessage] = useState<string | null>(null)
   const [oauthError, setOauthError] = useState<string | null>(null)
   const [tab, setTab] = useState(0)
+  const [showForgot, setShowForgot] = useState(false)
   const [searchParams, setSearchParams] = useSearchParams()
   const navigate = useNavigate()
   const user = useUnit($user)
@@ -27,10 +29,46 @@ export function AuthPage() {
     if (user) navigate('/', { replace: true })
   }, [navigate, user])
 
-  const oauthErrorParam = searchParams.get('oauthError')
-  if (oauthErrorParam) {
-    setOauthError(oauthErrorParam)
+  useEffect(() => {
+    const err = searchParams.get('oauthError')
+    if (!err) return
+    setOauthError(err)
     setSearchParams({}, { replace: true })
+  }, [searchParams, setSearchParams])
+
+  if (showForgot) {
+    return (
+      <Box
+        sx={{
+          display: 'flex',
+          alignItems: 'start',
+          justifyContent: 'center',
+          minHeight: 'calc(100vh - 64px)',
+          px: 2,
+          background: `radial-gradient(circle at 50% 30%, ${alpha(theme.palette.primary.main, 0.05)} 0%, transparent 70%)`,
+        }}
+      >
+        <Box sx={{ width: '100%', maxWidth: 440 }}>
+          <Box sx={{ display: 'flex', justifyContent: 'center', mb: 2 }}>
+            <BearLogo sx={{ fontSize: 72 }} />
+          </Box>
+
+          <Typography variant="h5" sx={{ fontWeight: 700, textAlign: 'center' }} gutterBottom>
+            Восстановление пароля
+          </Typography>
+
+          <Paper
+            sx={{
+              p: 4,
+              borderRadius: 3,
+              border: `1px solid ${theme.palette.divider}`,
+            }}
+          >
+            <AuthForgotForm onBack={() => setShowForgot(false)} />
+          </Paper>
+        </Box>
+      </Box>
+    )
   }
 
   return (
@@ -104,6 +142,12 @@ export function AuthPage() {
           {tab === 0 && <AuthPasswordForm isRegister={false} onSuccess={() => navigate('/', { replace: true })} />}
           {tab === 1 && <AuthCodeForm onSuccess={() => navigate('/', { replace: true })} />}
 
+          <Box sx={{ mt: 2, mb: 1, display: 'flex', justifyContent: 'center' }}>
+            <Button variant="text" size="small" onClick={() => setShowForgot(true)}>
+              Забыли пароль?
+            </Button>
+          </Box>
+
           <Box sx={{ mt: 3, mb: 1, display: 'flex', alignItems: 'center', gap: 1 }}>
             <Box sx={{ flex: 1, borderBottom: `1px solid ${theme.palette.divider}` }} />
             <Typography variant="body2" color="text.secondary" sx={{ px: 1, whiteSpace: 'nowrap' }}>