feat: importar csv y auditar ediciones

openspec/changes/add-navigation-csv-audit/specs/auditable-edits/spec.md

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+# Spec Delta
+
+## Purpose
+
+Garantiza que cambios posteriores al registro original de productores, productos y ventas sean explicables y aparezcan en la información exportada y reportada.
+
+## ADDED Requirements
+
+### Requirement: Editar registros operativos
+The system SHALL allow editing producers, products, and sales from the application UI.
+
+#### Scenario: Editar producto
+- **WHEN** user edits a product and confirms with actor and reason
+- **THEN** the product stores the new values
+- **AND** the edit appears in the audit history
+
+### Requirement: Auditoría obligatoria
+The system SHALL require actor and non-empty reason for every edit and SHALL store before and after values with timestamp.
+
+#### Scenario: Edición sin motivo
+- **WHEN** user attempts to save an edit without actor or reason
+- **THEN** the edit is not persisted
+- **AND** an inline validation message identifies the missing data
+
+### Requirement: Corrección de venta trazable
+The system SHALL update inventory consistently when an existing sale is edited and SHALL preserve the original and corrected sale snapshots.
+
+#### Scenario: Cambiar cantidad vendida
+- **WHEN** user changes a sale line quantity with a valid audit reason
+- **THEN** compensating inventory movement is recorded
+- **AND** the audit entry identifies the original and new sale values