fix: unify wheel Stars payment across desktop and mobile

- Use Telegram Stars invoice on all platforms instead of balance
  payment on desktop
- Show star cost in toggle and subtitle everywhere
- Show popup/toast when Stars are not enabled and user tries to spin
- Remove platform-specific payment type auto-select logic
- Add starsNotAvailable translation key (ru, en, zh, fa)

src/locales/en.json

@@ -713,6 +713,7 @@
     "starsPaymentSuccessCheckHistory": "Payment successful! Check history or Telegram for the result.",
     "starsPaymentFailed": "Payment failed. Please try again.",
     "starsPaymentRedirected": "Telegram will open for payment. Refresh the page after payment.",
+    "starsNotAvailable": "Star payments are currently unavailable. Contact support.",
     "youWon": "You won",
     "noPrize": "No luck this time...",
     "noHistory": "No spin history yet",

src/locales/fa.json

@@ -599,6 +599,7 @@
     "starsPaymentSuccess": "پرداخت موفق! نتیجه به تلگرام ارسال شد.",
     "starsPaymentFailed": "پرداخت ناموفق. دوباره تلاش کنید.",
     "starsPaymentRedirected": "تلگرام برای پرداخت باز می‌شود. پس از پرداخت صفحه را بازخوانی کنید.",
+    "starsNotAvailable": "پرداخت با ستاره در حال حاضر در دسترس نیست. با پشتیبانی تماس بگیرید.",
     "noHistory": "هنوز تاریخچه‌ای نیست",
     "banner": {
       "title": "شانس خود را امتحان کنید!",

src/locales/ru.json

@@ -741,6 +741,7 @@
     "starsPaymentSuccessCheckHistory": "Оплата прошла! Проверьте историю или Telegram для результата.",
     "starsPaymentFailed": "Ошибка оплаты. Попробуйте еще раз.",
     "starsPaymentRedirected": "Откроется Telegram для оплаты. После оплаты обновите страницу.",
+    "starsNotAvailable": "Оплата звёздами сейчас недоступна. Обратитесь в поддержку.",
     "youWon": "Вы выиграли",
     "noPrize": "В этот раз не повезло...",
     "noHistory": "История вращений пуста",

src/locales/zh.json

@@ -603,6 +603,7 @@
     "starsPaymentSuccess": "支付成功！抽奖结果已发送到Telegram。",
     "starsPaymentFailed": "支付失败。请重试。",
     "starsPaymentRedirected": "将打开Telegram进行支付。支付后请刷新页面。",
+    "starsNotAvailable": "星星支付暂不可用。请联系客服。",
     "noHistory": "暂无抽奖记录",
     "banner": {
       "title": "试试运气！",