null safety

lib/data/models/response/inventory_analytic_response_model.dart

@@ -160,7 +160,7 @@ class InventoryProductItem {
   final String categoryName;
   final int quantity;
   final int reorderLevel;
-  final int unitCost;
+  final num unitCost;
   final int totalValue;
   final int totalIn;
   final int totalOut;
@@ -228,7 +228,7 @@ class InventoryIngredientItem {
   final String unitName;
   final int quantity;
   final int reorderLevel;
-  final int unitCost;
+  final num unitCost;
   final int totalValue;
   final int totalIn;
   final int totalOut;

lib/data/models/response/payment_method_analytic_response_model.dart

@@ -132,7 +132,7 @@ class PaymentMethodAnalyticItem {
   final int totalAmount;
   final int orderCount;
   final int paymentCount;
-  final int percentage;
+  final num percentage;
 
   PaymentMethodAnalyticItem({
     required this.paymentMethodId,

lib/data/models/response/profit_loss_response_model.dart

@@ -98,12 +98,12 @@ class ProfitLossData {
 
 class ProfitLossSummary {
   final int totalRevenue;
-  final int totalCost;
-  final int grossProfit;
+  final num totalCost;
+  final num grossProfit;
   final double grossProfitMargin;
   final int totalTax;
   final int totalDiscount;
-  final int netProfit;
+  final num netProfit;
   final double netProfitMargin;
   final int totalOrders;
   final double averageProfit;
@@ -159,12 +159,12 @@ class ProfitLossSummary {
 class ProfitLossItem {
   final String date;
   final int revenue;
-  final int cost;
-  final int grossProfit;
+  final num cost;
+  final num grossProfit;
   final double grossProfitMargin;
   final int tax;
   final int discount;
-  final int netProfit;
+  final num netProfit;
   final double netProfitMargin;
   final int orders;
 
@@ -219,12 +219,12 @@ class ProfitLossProduct {
   final String categoryName;
   final int quantitySold;
   final int revenue;
-  final int cost;
-  final int grossProfit;
+  final num cost;
+  final num grossProfit;
   final double grossProfitMargin;
   final int averagePrice;
-  final int averageCost;
-  final int profitPerUnit;
+  final num averageCost;
+  final num profitPerUnit;
 
   ProfitLossProduct({
     required this.productId,