fix: inline Stars confirmation and unified payment type display

- Replace confirm dialog with inline UI panel to avoid browser popup
  blockers — pay button click is a direct user gesture
- Pre-open browser window synchronously on pay click for fallback
- Unify payment type display: show same styled panel whether one or
  both methods are enabled (single method = full-width button)
- Remove getCostSubtitle text, add payStars translation key (ru, en,
  zh, fa)

src/locales/zh.json

@@ -604,8 +604,8 @@
     "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。",
-    "confirmStarsTitle": "星星支付",
-    "confirmStarsPayment": "您将被重定向到Telegram进行一次转盘支付。继续吗？",
+    "confirmStarsPayment": "您将被重定向到Telegram进行一次转盘支付。",
+    "payStars": "支付 {{count}} ⭐",
     "noHistory": "暂无抽奖记录",
     "banner": {
       "title": "试试运气！",