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- Add type query param to GET /accounts/:accountId/positions endpoint - Backend filters T-Bank portfolio positions by instrument type before pagination - Each instrument type (share, bond, etf, fund) has its own frontend table with independent cursor-based pagination and skeleton loading - Groups with no positions are automatically hidden - Cache key includes type for correct per-type caching - Remove centralized positions pagination state from BrokerAccountDetailPage - 94 backend tests / 112 frontend tests pass