PDF テンプレート型エラー修正\n- 可変長パラメータに初期値付与\n- fromMap メソッドで null セーフ化\n\nビルド完了（48.8MB）

lib/pdf_templates/sales_invoice_template.dart

@@ -10,21 +10,21 @@ class SalesInvoiceTemplate {
   final String taxRate;
 
   const SalesInvoiceTemplate({
-    required this.invoiceNumber,
+    this.invoiceNumber = '',
-    required this.date,
+    this.date = '',
-    required this.customerName,
+    this.customerName = '',
-    required this.items,
+    this.items = const <Map<String, dynamic>>[],
-    required this.totalAmount,
+    this.totalAmount = 0,
     this.taxRate = '8',
   });
 
   factory SalesInvoiceTemplate.fromMap(Map<String, dynamic> data) {
-    return const SalesInvoiceTemplate(
+    return SalesInvoiceTemplate(
-      invoiceNumber: '',
+      invoiceNumber: data['invoice'] as String? ?? '',
-      date: '',
+      date: data['date'] as String? ?? '',
-      customerName: '',
+      customerName: data['customer_name'] as String? ?? '',
-      items: [],
+      items: (data['items'] as List<dynamic>?)?.map((e) => e as Map<String, dynamic>).toList() ?? const <Map<String, dynamic>>[],
-      totalAmount: 0,
+      totalAmount: (data['total'] as int?) ?? 0,
     );
   }