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/components/CampaignBonusNotifier.tsx

@@ -0,0 +1,46 @@
+import { useEffect } from 'react';
+import { useTranslation } from 'react-i18next';
+import { useAuthStore } from '../store/auth';
+import { useToast } from './Toast';
+
+export default function CampaignBonusNotifier() {
+  const { t } = useTranslation();
+  const { showToast } = useToast();
+  const bonus = useAuthStore((s) => s.pendingCampaignBonus);
+  const clearBonus = useAuthStore((s) => s.clearCampaignBonus);
+
+  useEffect(() => {
+    if (!bonus) return;
+
+    let message: string | null = null;
+    if (bonus.bonus_type === 'balance' && bonus.balance_kopeks > 0) {
+      message = t('campaignBonus.balance', {
+        amount: (bonus.balance_kopeks / 100).toFixed(0),
+        name: bonus.campaign_name,
+      });
+    } else if (bonus.bonus_type === 'subscription' && bonus.subscription_days) {
+      message = t('campaignBonus.subscription', {
+        days: bonus.subscription_days,
+        name: bonus.campaign_name,
+      });
+    } else if (bonus.bonus_type === 'tariff' && bonus.tariff_name) {
+      message = t('campaignBonus.tariff', {
+        tariff: bonus.tariff_name,
+        name: bonus.campaign_name,
+      });
+    }
+
+    if (message) {
+      showToast({
+        type: 'success',
+        title: t('campaignBonus.title'),
+        message,
+        duration: 8000,
+      });
+    }
+
+    clearBonus();
+  }, [bonus, clearBonus, showToast, t]);
+
+  return null;
+}

src/components/layout/AppShell/AppShell.tsx

@@ -16,6 +16,7 @@ import { cn } from '@/lib/utils';
 import { UI } from '@/config/constants';
 
 import WebSocketNotifications from '@/components/WebSocketNotifications';
+import CampaignBonusNotifier from '@/components/CampaignBonusNotifier';
 import SuccessNotificationModal from '@/components/SuccessNotificationModal';
 import LanguageSwitcher from '@/components/LanguageSwitcher';
 import TicketNotificationBell from '@/components/TicketNotificationBell';
@@ -281,6 +282,7 @@ export function AppShell({ children }: AppShellProps) {
 
       {/* Global components */}
       <WebSocketNotifications />
+      <CampaignBonusNotifier />
       <SuccessNotificationModal />
 
       {/* Desktop Header */}