# Spec Delta

## Purpose

Garantiza que la versión Android muestre los controles de navegación y operación con iconos visibles y que los errores de venta puedan resolverse desde la interfaz.

## ADDED Requirements

### Requirement: Iconos y menú operables
The system SHALL render MDI icons for navigation, quantity controls, deletion, and breadcrumbs in the Android WebView.

#### Scenario: Menú APK
- **WHEN** the app opens on Android
- **THEN** a visible menu button opens the navigation drawer
- **AND** breadcrumb and action icons are visible

### Requirement: Diagnóstico de stock
The system SHALL show available stock and explain when a product cannot be added or sold because inventory is insufficient.

#### Scenario: Producto sin inventario
- **WHEN** user selects a product with zero stock
- **THEN** the product is not added to the cart
- **AND** the UI explains that initial inventory must be registered