refactor(admin-user-detail): extract Gifts + Sync tabs to own components

AdminUserDetail.tsx was 3820 lines — a single page bigger than the
project's 800-line soft cap by 4.7x. Split the two most self-contained
tabs (no mutations / setState from within the tab body) into their
own files under src/components/admin/userDetail/:

  GiftsTab.tsx (299 lines)
    - GiftStatusBadge       (badge for one of 6 lifecycle states)
    - GiftCard              (single row, sent or received)
    - GiftsTab              (sent + received sections + counters)
    props: giftsLoading, giftsData, locale, onNavigateToUser

  SyncTab.tsx (207 lines)
    - ArrowDownIcon, ArrowUpIcon (used only by sync action buttons)
    - SyncTab (bot vs panel comparison + 2-way sync)
    props: user, syncStatus, userSubscriptions, activeSubscriptionId,
           onActiveSubscriptionChange, actionLoading, onSyncFromPanel,
           onSyncToPanel, locale

Net: AdminUserDetail.tsx down to 3381 lines (-439). No behaviour change:
the tabs render the exact same DOM, same SVG paths, same event handlers
just routed through props.

src/components/admin/userDetail/GiftsTab.tsx

@@ -0,0 +1,301 @@
+import { useTranslation } from 'react-i18next';
+import { useCurrency } from '../../../hooks/useCurrency';
+import type { AdminUserGiftItem, AdminUserGiftsResponse } from '../../../api/adminUsers';
+
+// ──────────────────────────────────────────────────────────────────
+// Status badge
+// ──────────────────────────────────────────────────────────────────
+
+function GiftStatusBadge({ status }: { status: string }) {
+  const { t } = useTranslation();
+  const styles: Record<string, string> = {
+    pending: 'bg-warning-500/20 text-warning-400 border-warning-500/30',
+    paid: 'bg-accent-500/20 text-accent-400 border-accent-500/30',
+    delivered: 'bg-success-500/20 text-success-400 border-success-500/30',
+    pending_activation: 'bg-accent-500/20 text-accent-400 border-accent-500/30',
+    failed: 'bg-error-500/20 text-error-400 border-error-500/30',
+    expired: 'bg-dark-600 text-dark-400 border-dark-500',
+  };
+  const fallback = 'bg-dark-600 text-dark-400 border-dark-500';
+
+  const label = t(`admin.users.detail.gifts.status.${status}`, { defaultValue: '' }) || status;
+
+  return (
+    <span
+      className={`rounded-full border px-2 py-0.5 text-[10px] font-medium uppercase tracking-wider ${styles[status] || fallback}`}
+    >
+      {label}
+    </span>
+  );
+}
+
+// ──────────────────────────────────────────────────────────────────
+// Single gift card
+// ──────────────────────────────────────────────────────────────────
+
+function GiftCard({
+  gift,
+  direction,
+  locale,
+  onNavigateToUser,
+}: {
+  gift: AdminUserGiftItem;
+  direction: 'sent' | 'received';
+  locale: string;
+  onNavigateToUser: (userId: number) => void;
+}) {
+  const { t } = useTranslation();
+  const { formatWithCurrency } = useCurrency();
+  const isSent = direction === 'sent';
+
+  const otherPartyLabel = isSent
+    ? t('admin.users.detail.gifts.recipient')
+    : t('admin.users.detail.gifts.sender');
+  const otherPartyName = isSent
+    ? gift.receiver_username
+      ? `@${gift.receiver_username}`
+      : gift.gift_recipient_value || t('admin.users.detail.gifts.codeOnly')
+    : gift.buyer_username
+      ? `@${gift.buyer_username}`
+      : gift.buyer_full_name || t('admin.users.detail.gifts.unknownUser');
+  const otherPartyId = isSent ? gift.receiver_user_id : gift.buyer_user_id;
+
+  const dateOpts: Intl.DateTimeFormatOptions = {
+    day: '2-digit',
+    month: '2-digit',
+    year: '2-digit',
+    hour: '2-digit',
+    minute: '2-digit',
+  };
+
+  return (
+    <div className="rounded-xl border border-dark-700/50 bg-dark-800/50 p-4 transition-colors hover:bg-dark-800/70">
+      {/* Header */}
+      <div className="mb-3 flex items-start justify-between">
+        <div className="flex items-center gap-2">
+          <div
+            className={`flex h-8 w-8 items-center justify-center rounded-lg ${isSent ? 'bg-accent-500/15' : 'bg-success-500/15'}`}
+          >
+            <svg
+              className={`h-4 w-4 ${isSent ? 'text-accent-400' : 'text-success-400'}`}
+              fill="none"
+              viewBox="0 0 24 24"
+              stroke="currentColor"
+              strokeWidth={2}
+            >
+              <path
+                strokeLinecap="round"
+                strokeLinejoin="round"
+                d="M21 11.25v8.25a1.5 1.5 0 01-1.5 1.5H5.25a1.5 1.5 0 01-1.5-1.5v-8.25M12 4.875A2.625 2.625 0 109.375 7.5H12m0-2.625V7.5m0-2.625A2.625 2.625 0 1114.625 7.5H12m0 0V21m-8.625-9.75h18c.621 0 1.125-.504 1.125-1.125v-1.5c0-.621-.504-1.125-1.125-1.125h-18c-.621 0-1.125.504-1.125 1.125v1.5c0 .621.504 1.125 1.125 1.125z"
+              />
+            </svg>
+          </div>
+          <div>
+            <div className="text-sm font-medium text-dark-100">{gift.tariff_name || '—'}</div>
+            <div className="text-xs text-dark-500">
+              {gift.period_days} {t('admin.users.detail.gifts.days')} · {gift.device_limit}{' '}
+              {t('admin.users.detail.gifts.devices')}
+            </div>
+          </div>
+        </div>
+        <GiftStatusBadge status={gift.status} />
+      </div>
+
+      {/* Details grid */}
+      <div className="grid grid-cols-2 gap-x-4 gap-y-2 text-xs">
+        <div>
+          <span className="text-dark-500">{otherPartyLabel}:</span>{' '}
+          <span className="text-dark-300">{otherPartyName}</span>
+          {otherPartyId && (
+            <button
+              onClick={() => onNavigateToUser(otherPartyId)}
+              className="ml-1 text-accent-400 hover:text-accent-300"
+            >
+              #{otherPartyId}
+            </button>
+          )}
+        </div>
+        <div>
+          <span className="text-dark-500">{t('admin.users.detail.gifts.amount')}:</span>{' '}
+          <span className="text-dark-300">{formatWithCurrency(gift.amount_kopeks / 100)}</span>
+        </div>
+        <div>
+          <span className="text-dark-500">{t('admin.users.detail.gifts.paymentMethod')}:</span>{' '}
+          <span className="text-dark-300">{gift.payment_method || '—'}</span>
+        </div>
+        <div>
+          <span className="text-dark-500">{t('admin.users.detail.gifts.createdAt')}:</span>{' '}
+          <span className="text-dark-300">
+            {gift.created_at ? new Date(gift.created_at).toLocaleString(locale, dateOpts) : '—'}
+          </span>
+        </div>
+        {gift.paid_at && (
+          <div>
+            <span className="text-dark-500">{t('admin.users.detail.gifts.paidAt')}:</span>{' '}
+            <span className="text-dark-300">
+              {new Date(gift.paid_at).toLocaleString(locale, dateOpts)}
+            </span>
+          </div>
+        )}
+        {gift.delivered_at && (
+          <div>
+            <span className="text-dark-500">{t('admin.users.detail.gifts.deliveredAt')}:</span>{' '}
+            <span className="text-success-400">
+              {new Date(gift.delivered_at).toLocaleString(locale, dateOpts)}
+            </span>
+          </div>
+        )}
+      </div>
+
+      {/* Gift message */}
+      {gift.gift_message && (
+        <div className="mt-3 rounded-lg bg-dark-900/50 p-2.5 text-xs italic text-dark-400">
+          &ldquo;{gift.gift_message}&rdquo;
+        </div>
+      )}
+
+      {/* Token */}
+      <div className="mt-2 font-mono text-[10px] text-dark-600">GIFT-{gift.token}</div>
+    </div>
+  );
+}
+
+// ──────────────────────────────────────────────────────────────────
+// Tab — gifts list with sent + received sections
+// ──────────────────────────────────────────────────────────────────
+
+export interface GiftsTabProps {
+  giftsLoading: boolean;
+  giftsData: AdminUserGiftsResponse | null;
+  locale: string;
+  onNavigateToUser: (userId: number) => void;
+}
+
+export function GiftsTab({ giftsLoading, giftsData, locale, onNavigateToUser }: GiftsTabProps) {
+  const { t } = useTranslation();
+
+  if (giftsLoading) {
+    return (
+      <div className="flex items-center justify-center py-12">
+        <div className="h-8 w-8 animate-spin rounded-full border-2 border-accent-500 border-t-transparent" />
+      </div>
+    );
+  }
+
+  if (!giftsData || (giftsData.sent.length === 0 && giftsData.received.length === 0)) {
+    return (
+      <div className="flex flex-col items-center justify-center rounded-xl bg-dark-800/50 py-16">
+        <svg
+          className="mb-3 h-12 w-12 text-dark-600"
+          fill="none"
+          viewBox="0 0 24 24"
+          stroke="currentColor"
+          strokeWidth={1.5}
+        >
+          <path
+            strokeLinecap="round"
+            strokeLinejoin="round"
+            d="M21 11.25v8.25a1.5 1.5 0 01-1.5 1.5H5.25a1.5 1.5 0 01-1.5-1.5v-8.25M12 4.875A2.625 2.625 0 109.375 7.5H12m0-2.625V7.5m0-2.625A2.625 2.625 0 1114.625 7.5H12m0 0V21m-8.625-9.75h18c.621 0 1.125-.504 1.125-1.125v-1.5c0-.621-.504-1.125-1.125-1.125h-18c-.621 0-1.125.504-1.125 1.125v1.5c0 .621.504 1.125 1.125 1.125z"
+          />
+        </svg>
+        <p className="text-sm text-dark-500">{t('admin.users.detail.gifts.noGifts')}</p>
+      </div>
+    );
+  }
+
+  return (
+    <div className="space-y-6">
+      {/* Summary counters */}
+      <div className="grid grid-cols-2 gap-3">
+        <div className="rounded-xl bg-dark-800/50 p-4">
+          <div className="mb-1 text-xs text-dark-500">
+            {t('admin.users.detail.gifts.totalSent')}
+          </div>
+          <div className="text-2xl font-bold text-accent-400">{giftsData.sent_total}</div>
+        </div>
+        <div className="rounded-xl bg-dark-800/50 p-4">
+          <div className="mb-1 text-xs text-dark-500">
+            {t('admin.users.detail.gifts.totalReceived')}
+          </div>
+          <div className="text-2xl font-bold text-success-400">{giftsData.received_total}</div>
+        </div>
+      </div>
+
+      {/* Sent Gifts */}
+      <div>
+        <h3 className="mb-3 flex items-center gap-2 text-sm font-semibold text-dark-200">
+          <svg
+            className="h-4 w-4 text-accent-400"
+            fill="none"
+            viewBox="0 0 24 24"
+            stroke="currentColor"
+            strokeWidth={2}
+          >
+            <path
+              strokeLinecap="round"
+              strokeLinejoin="round"
+              d="M6 12L3.269 3.126A59.768 59.768 0 0121.485 12 59.77 59.77 0 013.27 20.876L5.999 12zm0 0h7.5"
+            />
+          </svg>
+          {t('admin.users.detail.gifts.sentTitle')}
+          <span className="text-dark-500">({giftsData.sent_total})</span>
+        </h3>
+        {giftsData.sent.length === 0 ? (
+          <div className="rounded-xl bg-dark-800/30 py-6 text-center text-sm text-dark-500">
+            {t('admin.users.detail.gifts.noSent')}
+          </div>
+        ) : (
+          <div className="space-y-2">
+            {giftsData.sent.map((gift) => (
+              <GiftCard
+                key={gift.id}
+                gift={gift}
+                direction="sent"
+                locale={locale}
+                onNavigateToUser={onNavigateToUser}
+              />
+            ))}
+          </div>
+        )}
+      </div>
+
+      {/* Received Gifts */}
+      <div>
+        <h3 className="mb-3 flex items-center gap-2 text-sm font-semibold text-dark-200">
+          <svg
+            className="h-4 w-4 text-success-400"
+            fill="none"
+            viewBox="0 0 24 24"
+            stroke="currentColor"
+            strokeWidth={2}
+          >
+            <path
+              strokeLinecap="round"
+              strokeLinejoin="round"
+              d="M9 3.75H6.912a2.25 2.25 0 00-2.15 1.588L2.35 13.177a2.25 2.25 0 00-.1.661V18a2.25 2.25 0 002.25 2.25h15A2.25 2.25 0 0021.75 18v-4.162c0-.224-.034-.447-.1-.661L19.24 5.338a2.25 2.25 0 00-2.15-1.588H15M2.25 13.5h3.86a2.25 2.25 0 012.012 1.244l.256.512a2.25 2.25 0 002.013 1.244h3.218a2.25 2.25 0 002.013-1.244l.256-.512a2.25 2.25 0 012.013-1.244h3.859"
+            />
+          </svg>
+          {t('admin.users.detail.gifts.receivedTitle')}
+          <span className="text-dark-500">({giftsData.received_total})</span>
+        </h3>
+        {giftsData.received.length === 0 ? (
+          <div className="rounded-xl bg-dark-800/30 py-6 text-center text-sm text-dark-500">
+            {t('admin.users.detail.gifts.noReceived')}
+          </div>
+        ) : (
+          <div className="space-y-2">
+            {giftsData.received.map((gift) => (
+              <GiftCard
+                key={gift.id}
+                gift={gift}
+                direction="received"
+                locale={locale}
+                onNavigateToUser={onNavigateToUser}
+              />
+            ))}
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}