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/types/index.ts

@@ -21,6 +21,15 @@ export interface OAuthProvider {
   display_name: string;
 }
 
+// Campaign bonus info (returned during auth)
+export interface CampaignBonusInfo {
+  campaign_name: string;
+  bonus_type: 'balance' | 'subscription' | 'tariff' | 'none';
+  balance_kopeks: number;
+  subscription_days: number | null;
+  tariff_name: string | null;
+}
+
 // Auth types
 export interface AuthResponse {
   access_token: string;
@@ -28,6 +37,7 @@ export interface AuthResponse {
   token_type: string;
   expires_in: number;
   user: User;
+  campaign_bonus?: CampaignBonusInfo | null;
 }
 
 export interface TokenResponse {