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TransactionsTable — server-driven история транзакций (GET /api/billing/transactions, табы → фильтр type). InvoicesTable — GET /api/billing/invoices с empty-state (real-but-empty до Б-1). billingFormatters почищен (drop status/format-функций), mockBilling ужат до pending-баннера (E4). Sprint 2 Plan C, audit E3 (frontend pt2). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>