feat: add recharts analytics to admin campaign stats page

- Move shared chart components (DailyChart, PeriodComparison, StatCard) to src/components/stats/ with configurable label props
- Create shared types for chart data decoupled from partner API
- Add campaign chart data API client with deposits/spending split
- Enhance AdminCampaignStats with daily trends chart, period comparison, top registrations, and deposit/spending stat cards
- Add useChartColors hook with SSR guard and theme-aware CSS variable parsing
- Add cross-platform clipboard utility with execCommand fallback for Telegram WebView
- Add i18n keys for chart analytics across all 4 locales (en, ru, zh, fa)
- Responsive fixes: truncation for long names/values, responsive text sizing, touch-friendly copy buttons

src/api/partners.ts

@@ -27,6 +27,10 @@ export interface PartnerCampaignInfo {
   subscription_traffic_gb: number | null;
   deep_link: string | null;
   web_link: string | null;
+  // Per-campaign statistics
+  registrations_count: number;
+  referrals_count: number;
+  earnings_kopeks: number;
 }
 
 export interface PartnerStatusResponse {
@@ -45,6 +49,57 @@ export interface PartnerApplicationRequest {
   desired_commission_percent?: number;
 }
 
+// ==================== Campaign detailed stats types ====================
+
+export interface DailyStatItem {
+  date: string;
+  referrals_count: number;
+  earnings_kopeks: number;
+}
+
+export interface PeriodStats {
+  days: number;
+  referrals_count: number;
+  earnings_kopeks: number;
+}
+
+export interface PeriodChange {
+  absolute: number;
+  percent: number;
+  trend: 'up' | 'down' | 'stable';
+}
+
+export interface PeriodComparison {
+  current: PeriodStats;
+  previous: PeriodStats;
+  referrals_change: PeriodChange;
+  earnings_change: PeriodChange;
+}
+
+export interface CampaignReferralItem {
+  id: number;
+  full_name: string;
+  created_at: string;
+  has_paid: boolean;
+  is_active: boolean;
+  total_earnings_kopeks: number;
+}
+
+export interface PartnerCampaignDetailedStats {
+  campaign_id: number;
+  campaign_name: string;
+  registrations_count: number;
+  referrals_count: number;
+  earnings_kopeks: number;
+  conversion_rate: number;
+  earnings_today: number;
+  earnings_week: number;
+  earnings_month: number;
+  daily_stats: DailyStatItem[];
+  period_comparison: PeriodComparison;
+  top_referrals: CampaignReferralItem[];
+}
+
 // ==================== Admin-facing types ====================
 
 export interface AdminPartnerApplicationItem {
@@ -159,6 +214,13 @@ export const partnerApi = {
     return response.data;
   },
 
+  getCampaignStats: async (campaignId: number): Promise<PartnerCampaignDetailedStats> => {
+    const response = await apiClient.get<PartnerCampaignDetailedStats>(
+      `/cabinet/referral/partner/campaigns/${campaignId}/stats`,
+    );
+    return response.data;
+  },
+
   // Admin endpoints
   getStats: async (): Promise<PartnerStats> => {
     const response = await apiClient.get<PartnerStats>('/cabinet/admin/partners/stats');