TF-3088 Fix the ending date of custom date range isn't included in the search

lib/features/base/mixin/date_range_picker_mixin.dart

@@ -1,5 +1,6 @@
 
 import 'package:core/presentation/utils/app_toast.dart';
+import 'package:core/utils/app_logger.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter_date_range_picker/material_date_range_picker_dialog.dart';
 import 'package:get/get.dart';
@@ -64,8 +65,20 @@ mixin DateRangePickerMixin {
         AppLocalizations.of(context).toastMessageErrorWhenSelectDateIsInValid);
       return;
     }
-
+    log('DateRangePickerMixin::_handleSelectDateRangeResult:BEFORE:: StartDate = $startDate | EndDate = $endDate');
+    final tupleDate = validateDateRange(startDate: startDate, endDate: endDate);
+    log('DateRangePickerMixin::_handleSelectDateRangeResult:AFTER:: StartDate = ${tupleDate.startDate} | EndDate = ${tupleDate.endDate}');
     popBack();
-    onCallbackAction?.call(startDate, endDate);
+    onCallbackAction?.call(tupleDate.startDate, tupleDate.endDate);
+  }
+
+  ({DateTime? startDate, DateTime? endDate}) validateDateRange({
+    required DateTime? startDate,
+    required DateTime? endDate
+  }) {
+    final newStartDate = startDate?.copyWith(hour: 0, minute: 0);
+    final newEndDate = endDate?.copyWith(hour: 23, minute: 59);
+    log('DateRangePickerMixin::validateDateRange: newStartDate = $newStartDate | newEndDate = $newEndDate');
+    return (startDate: newStartDate, endDate: newEndDate);
   }
 }

test/features/base/mixin/date_range_picker_mixin_test.dart

@@ -0,0 +1,56 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:tmail_ui_user/features/base/mixin/date_range_picker_mixin.dart';
+
+class DateRangePickerMixinTest with DateRangePickerMixin {}
+
+void main() {
+  final dateRangePickerMixinTest = DateRangePickerMixinTest();
+
+  group('DateRangePickerMixin::validateDateRange::', () {
+    test('should set startDate to midnight and endDate to 23:59', () {
+      // Arrange
+      final DateTime startDate = DateTime(2024, 8, 30, 12, 30);
+      final DateTime endDate = DateTime(2024, 8, 31, 15, 45);
+
+      // Act
+      final result = dateRangePickerMixinTest.validateDateRange(startDate: startDate, endDate: endDate);
+
+      // Assert
+      expect(result.startDate, DateTime(2024, 8, 30, 0, 0));
+      expect(result.endDate, DateTime(2024, 8, 31, 23, 59));
+    });
+
+    test('should return null startDate and endDate if null input', () {
+      // Act
+      final result = dateRangePickerMixinTest.validateDateRange(startDate: null, endDate: null);
+
+      // Assert
+      expect(result.startDate, isNull);
+      expect(result.endDate, isNull);
+    });
+
+    test('should set startDate to midnight and keep endDate null if only startDate is provided', () {
+      // Arrange
+      final DateTime startDate = DateTime(2024, 8, 30, 12, 30);
+
+      // Act
+      final result = dateRangePickerMixinTest.validateDateRange(startDate: startDate, endDate: null);
+
+      // Assert
+      expect(result.startDate, DateTime(2024, 8, 30, 0, 0));
+      expect(result.endDate, isNull);
+    });
+
+    test('should set endDate to 23:59 and keep startDate null if only endDate is provided', () {
+      // Arrange
+      final DateTime endDate = DateTime(2024, 8, 31, 15, 45);
+
+      // Act
+      final result = dateRangePickerMixinTest.validateDateRange(startDate: null, endDate: endDate);
+
+      // Assert
+      expect(result.startDate, isNull);
+      expect(result.endDate, DateTime(2024, 8, 31, 23, 59));
+    });
+  });
+}