feat: guest purchase cabinet credentials UI

- CabinetCredentialsState with copyable email/password fields
- Auto-login via JWT token with checkAdminStatus
- /auto-login route with ErrorBoundary and no-referrer meta
- Narrowed contact_type to 'email' | 'telegram' | null
- Disabled button styling for PendingActivation go-to-cabinet
- i18n: added landing.copy key to all 4 locales

src/api/landings.ts

@@ -90,6 +90,10 @@ export interface PurchaseStatus {
   period_days: number | null;
   tariff_name: string | null;
   gift_message: string | null;
+  contact_type: 'email' | 'telegram' | null;
+  cabinet_email: string | null;
+  cabinet_password: string | null;
+  auto_login_token: string | null;
 }
 
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