Reconcile Seatwise pricing and dashboard totals

Work in the real product frontend and the transactional backend. A party must occupy contiguous columns in one row and its declared size must equal its seat selection. Accessible seats require their configured companion when requested. Charge each selected seat once, apply percentage child discounts with floor rounding, and count confirmed seats individually. Pricing and the persisted activity summary disagree with the domain policy. Repair both layers, preserving currency rounding, cancellation handling and repeated-plan semantics. Run bash test/run.sh. The public checks drive Chromium against native HTTP and a real database; each scoring group includes regression safeguards.

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