Add invite links

frontend/src/pages/RegisterPage.tsx

@@ -4,6 +4,7 @@ import { useForm } from 'react-hook-form'
 import { zodResolver } from '@hookform/resolvers/zod'
 import { z } from 'zod'
 import { useAuthStore } from '@/store/auth'
+import { marathonsApi } from '@/api'
 import { Button, Input, Card, CardHeader, CardTitle, CardContent } from '@/components/ui'
 
 const registerSchema = z.object({
@@ -27,7 +28,7 @@ type RegisterForm = z.infer<typeof registerSchema>
 
 export function RegisterPage() {
   const navigate = useNavigate()
-  const { register: registerUser, isLoading, error, clearError } = useAuthStore()
+  const { register: registerUser, isLoading, error, clearError, consumePendingInviteCode } = useAuthStore()
   const [submitError, setSubmitError] = useState<string | null>(null)
 
   const {
@@ -47,6 +48,19 @@ export function RegisterPage() {
         password: data.password,
         nickname: data.nickname,
       })
+
+      // Check for pending invite code
+      const pendingCode = consumePendingInviteCode()
+      if (pendingCode) {
+        try {
+          const marathon = await marathonsApi.join(pendingCode)
+          navigate(`/marathons/${marathon.id}`)
+          return
+        } catch {
+          // If join fails, just go to marathons
+        }
+      }
+
       navigate('/marathons')
     } catch {
       setSubmitError(error || 'Ошибка регистрации')