feat: Yandex Metrika CID tracking, offline conversions UI, sticky pay button

- Pass yandex_cid to all auth endpoints (telegram, email, OIDC, OAuth)
- Add OfflineConvGoal interface and offline_conv_* fields to AnalyticsCounters
- Add storeYandexCid API method for server-side CID persistence
- Add analytics fields to LandingConfig (view/click goals, sticky_pay_button)
- Add yandex_cid/referrer/subid to PurchaseRequest
- Add offline conversions UI block in admin AnalyticsTab
- Add cacheYandexCid, syncYandexCid, fireAnalyticsEvent to analytics hook
- Create yandexCid.ts utility (localStorage get/set helpers)
- Add sticky pay button with portal on mobile in QuickPurchase
- Fire view/click analytics goals on landing pages
- Persist contact value and referrer/subid in session/localStorage
- Add i18n keys for offlineConv and apiKey in all 4 locales

src/api/auth.ts

@@ -1,4 +1,5 @@
 import apiClient from './client';
+import { getYandexCid } from '../utils/yandexCid';
 import type {
   AuthResponse,
   LinkCallbackResponse,
@@ -22,6 +23,7 @@ export const authApi = {
       init_data: initData,
       campaign_slug: campaignSlug || undefined,
       referral_code: referralCode || undefined,
+      yandex_cid: getYandexCid() || undefined,
     });
     return response.data;
   },
@@ -43,6 +45,7 @@ export const authApi = {
       ...data,
       campaign_slug: campaignSlug || undefined,
       referral_code: referralCode || undefined,
+      yandex_cid: getYandexCid() || undefined,
     });
     return response.data;
   },
@@ -56,6 +59,7 @@ export const authApi = {
       id_token: idToken,
       campaign_slug: campaignSlug || undefined,
       referral_code: referralCode || undefined,
+      yandex_cid: getYandexCid() || undefined,
     });
     return response.data;
   },
@@ -71,6 +75,7 @@ export const authApi = {
       password,
       campaign_slug: campaignSlug || undefined,
       referral_code: referralCode || undefined,
+      yandex_cid: getYandexCid() || undefined,
     });
     return response.data;
   },
@@ -87,6 +92,7 @@ export const authApi = {
     const response = await apiClient.post('/cabinet/auth/email/register', {
       email,
       password,
+      yandex_cid: getYandexCid() || undefined,
     });
     return response.data;
   },
@@ -101,7 +107,7 @@ export const authApi = {
   }): Promise<RegisterResponse> => {
     const response = await apiClient.post<RegisterResponse>(
       '/cabinet/auth/email/register/standalone',
-      data,
+      { ...data, yandex_cid: getYandexCid() || undefined },
     );
     return response.data;
   },
@@ -198,6 +204,7 @@ export const authApi = {
         device_id: deviceId || undefined,
         campaign_slug: campaignSlug || undefined,
         referral_code: referralCode || undefined,
+        yandex_cid: getYandexCid() || undefined,
       },
     );
     return response.data;

src/api/branding.ts

@@ -38,10 +38,20 @@ export interface TelegramWidgetConfig {
   oidc_client_id: string;
 }
 
+export interface OfflineConvGoal {
+  name: string;
+  event_id: string;
+  dedup: string;
+}
+
 export interface AnalyticsCounters {
   yandex_metrika_id: string;
   google_ads_id: string;
   google_ads_label: string;
+  offline_conv_enabled?: boolean;
+  offline_conv_counter_id?: string;
+  offline_conv_measurement_secret_masked?: string;
+  offline_conv_goals?: OfflineConvGoal[];
 }
 
 const BRANDING_CACHE_KEY = 'cabinet_branding';
@@ -274,7 +284,14 @@ export const brandingApi = {
       const response = await apiClient.get<AnalyticsCounters>('/cabinet/branding/analytics');
       return response.data;
     } catch {
-      return { yandex_metrika_id: '', google_ads_id: '', google_ads_label: '' };
+      return {
+        yandex_metrika_id: '',
+        google_ads_id: '',
+        google_ads_label: '',
+        offline_conv_enabled: false,
+        offline_conv_counter_id: '',
+        offline_conv_goals: [],
+      };
     }
   },
 
@@ -303,4 +320,9 @@ export const brandingApi = {
     const response = await apiClient.patch<AnalyticsCounters>('/cabinet/branding/analytics', data);
     return response.data;
   },
+
+  // Store Yandex Metrika ClientID for the authenticated cabinet user
+  storeYandexCid: async (cid: string): Promise<void> => {
+    await apiClient.post('/cabinet/branding/analytics/yandex-cid', { cid });
+  },
 };

src/api/landings.ts

@@ -89,6 +89,12 @@ export interface LandingConfig {
   meta_description: string | null;
   discount: LandingDiscountInfo | null;
   background_config: AnimationConfig | null;
+  // Per-landing analytics goals + sticky pay button (bot PR #2852 backend fields)
+  analytics_view_enabled?: boolean;
+  analytics_view_goal?: string | null;
+  analytics_click_enabled?: boolean;
+  analytics_click_goal?: string | null;
+  sticky_pay_button?: boolean;
 }
 
 export interface PurchaseRequest {
@@ -102,6 +108,10 @@ export interface PurchaseRequest {
   gift_recipient_value?: string;
   gift_message?: string;
   language?: string;
+  // Yandex offline-conversions linkage (bot PR #2851 backend fields)
+  yandex_cid?: string;
+  referrer?: string;
+  subid?: string;
 }
 
 export interface PurchaseResponse {