feat: add web campaign links — capture, auth integration, bonus UI

- Add campaign.ts utility (capture from URL, localStorage with TTL, validation)
- Pass campaign_slug in all auth API methods (telegram, widget, email, oauth)
- Consume slug in auth store login methods, set pendingCampaignBonus state
- Add CampaignBonusNotifier component (toast on bonus, mounted in AppShell)
- Show web_link alongside bot deep_link in AdminCampaignStats
- Add CampaignBonusInfo type with union bonus_type
- Fix VerifyEmail: ref guard against StrictMode double-fire, setTimeout cleanup
- Fix AdminCampaignStats: setTimeout refs with cleanup, i18n-aware locale
- Wrap all localStorage access in try/catch (Safari private browsing safety)
- Add campaignBonus translations (ru/en/fa/zh)

src/locales/ru.json

@@ -73,6 +73,12 @@
     "newUserReply": "Ответ пользователя в тикете: {{title}}",
     "newUserReplyTitle": "Ответ пользователя"
   },
+  "campaignBonus": {
+    "title": "Бонус активирован!",
+    "balance": "Вам начислено {{amount}} руб. по акции «{{name}}»",
+    "subscription": "Вам предоставлена подписка на {{days}} дн. по акции «{{name}}»",
+    "tariff": "Вам предоставлен тариф «{{tariff}}» по акции «{{name}}»"
+  },
   "wsNotifications": {
     "balance": {
       "topupTitle": "Баланс пополнен",
@@ -2206,6 +2212,8 @@
         "inactive": "Неактивна",
         "copy": "Копировать",
         "copied": "Скопировано!",
+        "botLink": "Ссылка для бота",
+        "webLink": "Веб-ссылка",
         "users": "Пользователи",
         "noUsers": "Нет зарегистрированных пользователей",
         "paid": "Платил",