fix(pos): print tickets via iframe with measured height and configurable paper width

pos/blueprints/config_bp.py

@@ -1044,6 +1044,7 @@ RECEIPT_CONFIG_KEYS = [
     'receipt_show_iva_breakdown',
     'receipt_show_payment_details',
     'receipt_show_employee',
+    'receipt_paper_width',
 ]
 
 
@@ -1081,6 +1082,7 @@ def get_receipt_config():
         'show_iva_breakdown': _bool('receipt_show_iva_breakdown', True),
         'show_payment_details': _bool('receipt_show_payment_details', True),
         'show_employee': _bool('receipt_show_employee', False),
+        'paper_width': rows.get('receipt_paper_width', '80') or '80',
     })
 
 
@@ -1108,6 +1110,7 @@ def update_receipt_config():
         'receipt_show_iva_breakdown': 'true' if data.get('show_iva_breakdown') else 'false',
         'receipt_show_payment_details': 'true' if data.get('show_payment_details') else 'false',
         'receipt_show_employee': 'true' if data.get('show_employee') else 'false',
+        'receipt_paper_width': str(data.get('paper_width', '80') or '80'),
     }
 
     for key, value in settings.items():