fix: corregir ventas y mejorar catalogos

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

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+# Spec Delta
+
+## Purpose
+
+Permite operar catálogos con muchos productos sin perder orientación ni precisión al modificar cantidades o eliminar líneas.
+
+## ADDED Requirements
+
+### Requirement: Controles visibles del carrito
+The system SHALL provide visible plus, minus, and delete controls for each sale line.
+
+#### Scenario: Ajustar cantidad
+- **WHEN** user selects plus or minus
+- **THEN** quantity changes by one and never falls below one
+
+### Requirement: Búsqueda de catálogo
+The system SHALL filter products and producers by a visible search field without requiring network access.
+
+#### Scenario: Buscar producto
+- **WHEN** user enters a product or producer fragment
+- **THEN** only matching catalog entries are shown

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