fix: replace window.confirm with inline confirmation for unlink

window.confirm() is silently suppressed in Telegram Mini Apps and iOS
WebView, making unlink completely non-functional on mobile. Replaced
with two-click inline confirmation: first click shows destructive
"Confirm disconnect?" button, second click executes unlink. Button
resets on blur.

src/locales/en.json

@@ -3607,6 +3607,7 @@
       "link": "Connect",
       "unlink": "Disconnect",
       "unlinkConfirm": "Are you sure? You won't be able to sign in with this service after disconnecting.",
+      "unlinkConfirmBtn": "Confirm disconnect?",
       "cannotUnlinkLast": "Cannot disconnect the last sign-in method",
       "linkSuccess": "Account connected successfully",
       "unlinkSuccess": "Account disconnected successfully",

src/locales/fa.json

@@ -3043,6 +3043,7 @@
       "link": "اتصال",
       "unlink": "قطع اتصال",
       "unlinkConfirm": "آیا مطمئن هستید؟ پس از قطع اتصال نمی‌توانید از طریق این سرویس وارد شوید.",
+      "unlinkConfirmBtn": "تأیید قطع اتصال؟",
       "cannotUnlinkLast": "نمی‌توان آخرین روش ورود را قطع کرد",
       "linkSuccess": "حساب با موفقیت متصل شد",
       "unlinkSuccess": "اتصال حساب با موفقیت قطع شد",

src/locales/ru.json

@@ -4167,6 +4167,7 @@
       "link": "Привязать",
       "unlink": "Отвязать",
       "unlinkConfirm": "Вы уверены? После отвязки вы не сможете входить через этот сервис.",
+      "unlinkConfirmBtn": "Точно отвязать?",
       "cannotUnlinkLast": "Нельзя отвязать последний способ входа",
       "linkSuccess": "Аккаунт успешно привязан",
       "unlinkSuccess": "Аккаунт успешно отвязан",

src/locales/zh.json

@@ -3042,6 +3042,7 @@
       "link": "关联",
       "unlink": "取消关联",
       "unlinkConfirm": "确定吗？取消关联后，您将无法通过此服务登录。",
+      "unlinkConfirmBtn": "确认取消关联？",
       "cannotUnlinkLast": "无法取消最后一种登录方式",
       "linkSuccess": "账户关联成功",
       "unlinkSuccess": "账户取消关联成功",