fix: corregir ventas y mejorar catalogos

openspec/changes/fix-sale-transaction-catalog-ux/specs/sale-transaction-integrity/spec.md

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+# Spec Delta
+
+## Purpose
+
+Garantiza que confirmar una venta actualice ventas e inventario como una sola operación local, evitando datos parciales y errores de IndexedDB.
+
+## ADDED Requirements
+
+### Requirement: Persistencia atómica de venta
+The system SHALL persist the sale, sale lines, and inventory movements in one local transaction.
+
+#### Scenario: Venta confirmada
+- **GIVEN** an open day and sufficient stock
+- **WHEN** user confirms a sale
+- **THEN** sale, lines, and negative inventory movement are stored
+- **AND** no object store transaction error is raised