fix: harden gift subscription frontend after multi-agent review

- Handle expired status in GiftResult (stop polling + show FailedState)
- Add PollErrorState for balance mode poll errors (softer UX)
- Remove non-null assertions in handleSubmit (explicit narrowing)
- Wrap gift routes in ErrorBoundary
- Add pollErrorTitle/pollErrorDesc i18n keys to all 4 locales

src/locales/en.json

@@ -4152,13 +4152,26 @@
     "tryAgain": "Try again",
     "pollTimeout": "Processing is taking longer than usual",
     "pollTimeoutDesc": "Try checking the status later",
+    "pollErrorTitle": "Could not check gift status",
+    "pollErrorDesc": "Your purchase was successful. Check your dashboard for details.",
     "retry": "Check again",
+    "notFound": "Gift configuration not found",
     "noToken": "Invalid link",
+    "noTokenDesc": "This gift link is invalid or has expired.",
+    "days": "days",
     "tariff": "Tariff",
     "period": "Period",
     "giftMessageLabel": "Message",
     "recipientLabel": "Recipient",
     "featureDisabled": "Gift feature is temporarily unavailable",
-    "redirecting": "Redirecting..."
+    "redirecting": "Redirecting...",
+    "pending": {
+      "title": "You received a gift!",
+      "from": "from {{sender}}",
+      "activate": "Activate"
+    },
+    "warning": {
+      "telegram_unresolvable": "Could not verify this Telegram username. The recipient may not receive a notification about the gift."
+    }
   }
 }

src/locales/fa.json

@@ -3647,13 +3647,26 @@
     "tryAgain": "تلاش مجدد",
     "pollTimeout": "پردازش بیش از حد معمول طول کشیده",
     "pollTimeoutDesc": "بعداً وضعیت را بررسی کنید",
+    "pollErrorTitle": "بررسی وضعیت هدیه امکان‌پذیر نیست",
+    "pollErrorDesc": "خرید شما موفقیت‌آمیز بود. وضعیت را در داشبورد بررسی کنید.",
     "retry": "بررسی مجدد",
+    "notFound": "تنظیمات هدیه یافت نشد",
     "noToken": "لینک نامعتبر",
+    "noTokenDesc": "این لینک هدیه نامعتبر است یا منقضی شده.",
+    "days": "روز",
     "tariff": "طرح",
     "period": "مدت",
     "giftMessageLabel": "پیام",
     "recipientLabel": "گیرنده",
     "featureDisabled": "قابلیت هدیه موقتاً در دسترس نیست",
-    "redirecting": "در حال انتقال..."
+    "redirecting": "در حال انتقال...",
+    "pending": {
+      "title": "شما یک هدیه دریافت کردید!",
+      "from": "از {{sender}}",
+      "activate": "فعال‌سازی"
+    },
+    "warning": {
+      "telegram_unresolvable": "نام کاربری تلگرام قابل تأیید نبود. ممکن است گیرنده اعلان هدیه را دریافت نکند."
+    }
   }
 }

src/locales/ru.json

@@ -4714,13 +4714,26 @@
     "tryAgain": "Попробовать снова",
     "pollTimeout": "Обработка занимает больше времени, чем обычно",
     "pollTimeoutDesc": "Попробуйте проверить статус позже",
+    "pollErrorTitle": "Не удалось проверить статус подарка",
+    "pollErrorDesc": "Ваша покупка прошла успешно. Проверьте статус на главной странице.",
     "retry": "Проверить снова",
+    "notFound": "Конфигурация подарков не найдена",
     "noToken": "Ссылка недействительна",
+    "noTokenDesc": "Ссылка на подарок недействительна или просрочена.",
+    "days": "дн.",
     "tariff": "Тариф",
     "period": "Период",
     "giftMessageLabel": "Сообщение",
     "recipientLabel": "Получатель",
     "featureDisabled": "Функция подарков временно недоступна",
-    "redirecting": "Перенаправляем..."
+    "redirecting": "Перенаправляем...",
+    "pending": {
+      "title": "Вам подарили подписку!",
+      "from": "от {{sender}}",
+      "activate": "Активировать"
+    },
+    "warning": {
+      "telegram_unresolvable": "Не удалось проверить этот Telegram-юзернейм. Получатель может не получить уведомление о подарке."
+    }
   }
 }

src/locales/zh.json

@@ -3646,13 +3646,26 @@
     "tryAgain": "重试",
     "pollTimeout": "处理时间超出预期",
     "pollTimeoutDesc": "请稍后再查看状态",
+    "pollErrorTitle": "无法检查礼物状态",
+    "pollErrorDesc": "您的购买已成功。请在仪表板上查看详情。",
     "retry": "再次检查",
+    "notFound": "未找到礼物配置",
     "noToken": "无效链接",
+    "noTokenDesc": "此礼物链接无效或已过期。",
+    "days": "天",
     "tariff": "套餐",
     "period": "时长",
     "giftMessageLabel": "消息",
     "recipientLabel": "收件人",
     "featureDisabled": "礼物功能暂时不可用",
-    "redirecting": "正在跳转..."
+    "redirecting": "正在跳转...",
+    "pending": {
+      "title": "您收到了一份礼物！",
+      "from": "来自 {{sender}}",
+      "activate": "激活"
+    },
+    "warning": {
+      "telegram_unresolvable": "无法验证此 Telegram 用户名。收件人可能不会收到礼物通知。"
+    }
   }
 }