add pagination for invoice and update ui for material 3

lib/domain/entities/custom_duty.dart

@@ -14,8 +14,8 @@ class CustomDuty {
   factory CustomDuty.fromMap(Map<String, dynamic> map, String id) {
     return CustomDuty(
       id: id,
-      productType: map['product_type'],
-      desc: map['desc'],
+      productType: map['product_type'] ?? "",
+      desc: map['desc'] ?? "",
       fee: (map['fee'] ?? 0).toDouble(),
     );
   }

lib/domain/entities/invoice.dart

@@ -133,8 +133,9 @@ class Invoice {
         cargoTypesMaps.map((e) => CargoType.fromMap(e, e["id"])).toList();
     var customDutiesMap =
         List<Map<String, dynamic>>.from(map['custom_duties'] ?? []);
-    var customDuties =
-        customDutiesMap.map((e) => CustomDuty.fromMap(e, e["id"])).toList();
+    var customDuties = customDutiesMap
+        .map((e) => CustomDuty.fromMap(e, e["id"] ?? ""))
+        .toList();
     var handlingShipmentsMap =
         List<Map<String, dynamic>>.from(map['handling_fee_shipments'] ?? []);
     var handingShipments =
@@ -149,22 +150,23 @@ class Invoice {
     var discount = Discount.fromMap(discountMap, discountMap['id']);
     var paymentMaps = List<Map<String, dynamic>>.from(map['payments'] ?? []);
     var payments = paymentMaps.map((e) => Payment.fromMap(e, e["id"])).toList();
+
     return Invoice(
       id: docID,
-      invoiceNumber: map['invoice_number'],
+      invoiceNumber: map['invoice_number'] ?? "",
       invoiceDate: invd.toDate(),
-      userName: map['user_name'],
-      fcsID: map['fcs_id'],
-      phoneNumber: map['phone_number'],
-      amount: map['amount'],
+      userName: map['user_name'] ?? "",
+      fcsID: map['fcs_id'] ?? "",
+      phoneNumber: map['phone_number'] ?? "",
+      amount: map['amount'] ?? 0,
       paidAmount: double.tryParse(map['paid_amount'].toString()) ?? 0,
-      status: map['status'],
+      status: map['status'] ?? "",
       cartons: cartons,
       cargoTypes: cargoTypes,
       shipments: handingShipments,
       customDuties: customDuties,
-      deliveryFee: map['delivery_fee'],
-      invoiceURL: map['invoice_url'],
+      deliveryFee: map['delivery_fee'] ?? 0,
+      invoiceURL: map['invoice_url'] ?? "",
       paymentMethod: paymentMethod,
       discount: discount,
       payments: payments,

lib/domain/entities/user.dart

@@ -109,8 +109,8 @@ class User {
         fcsID: map['fcs_id'],
         privileges: _privileges,
         lastMessage: map['last_message'],
-        userUnseenCount: map['user_unseen_count'],
-        fcsUnseenCount: map['fcs_unseen_count'],
+        userUnseenCount: map['user_unseen_count'] ?? 0,
+        fcsUnseenCount: map['fcs_unseen_count'] ?? 0,
         preferCurrency: map['preferred_currency'],
         lastMessageTime: _date == null ? null : _date.toDate());
   }