extractPersonalization() now reads both 'attributes' and 'custom_fields' fields from the shopPRO API response, joining non-empty values with newline separator. Previously only custom_fields was imported, causing product attributes like "Woreczek jutowy", "Kolor koperty", "Zakrętka" to be lost during sync. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>