New /exam-marker/bank page: browse leaf questions across your papers, filter by
spec point (the spec-planning surface) and subject via facet chips, select
questions into a basket, and "Create paper" → POST /custom-papers → opens the new
template in setup. Dashboard gets a "Question bank" entry point.
examRepository.getBank + createCustomPaper; BankQuestion/BankResponse/custom-paper
types. tsc clean. Pairs with the mode-3 API endpoints (already merged).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
