Refactor EnvelopeType handling and improve validation

Removed AutoMapper dependency in `ReadEnvelopeTypesQueryHandler` and replaced it with manual projection to address null-materialization issues. Updated `EnvelopeType` entity properties to nullable types to align with the database schema. Adjusted computed properties to handle null values gracefully.

Enhanced `SenderEditorPage` with authentication checks, improved handling of reminder and expiry settings, and added validation for user input. Introduced `NormalizeSettings` and `ValidateSettings` methods to ensure consistent and valid configurations. Refactored checkbox value parsing for better reliability.

Injected `AuthService` and `IStringLocalizer` for authentication and localization support. Improved error messaging and localized validation errors. Performed minor code cleanup and refactoring for better readability and maintainability.

EnvelopeGenerator.Domain/Entities/EnvelopeType.cs

@@ -22,41 +22,41 @@ namespace EnvelopeGenerator.Domain.Entities
         public string Language { get; set; }
 
         [Column("EXPIRES_DAYS")]
-        public int ExpiresDays { get; set; }
+        public int? ExpiresDays { get; set; }
 
         [Column("CERTIFICATION_TYPE")]
-        public Constants.CertificationType CertificationType { get; set; } = Constants.CertificationType.AdvancedElectronicSignature;
+        public Constants.CertificationType? CertificationType { get; set; }
 
         [Column("USE_ACCESS_CODE")]
-        public bool UseAccessCode { get; set; }
+        public bool? UseAccessCode { get; set; }
 
         [Column("FINAL_EMAIL_TO_CREATOR")]
-        public Constants.FinalEmailType FinalEmailToCreator { get; set; }
+        public Constants.FinalEmailType? FinalEmailToCreator { get; set; }
 
         [Column("FINAL_EMAIL_TO_RECEIVERS")]
-        public Constants.FinalEmailType FinalEmailToReceivers { get; set; }
+        public Constants.FinalEmailType? FinalEmailToReceivers { get; set; }
 
         [Required]
         [Column("ADDED_WHEN", TypeName = "datetime")]
         public DateTime AddedWhen { get; set; }
 
         [Column("CHANGED_WHEN", TypeName = "datetime")]
-        public DateTime ChangedWhen { get; set; }
+        public DateTime? ChangedWhen { get; set; }
 
         [Column("EXPIRES_WARNING_DAYS")]
-        public int ExpiresWarningDays { get; set; }
+        public int? ExpiresWarningDays { get; set; }
 
         [Column("SEND_REMINDER_EMAILS")]
-        public bool SendReminderEmails { get; set; } = false;
+        public bool? SendReminderEmails { get; set; }
 
         [Column("FIRST_REMINDER_DAYS")]
-        public int FirstReminderDays { get; set; } = 0;
+        public int? FirstReminderDays { get; set; }
 
         [Column("REMINDER_INTERVAL_DAYS")]
-        public int ReminderIntervalDays { get; set; } = 0;
+        public int? ReminderIntervalDays { get; set; }
 
         [Column("CONTRACT_TYPE")]
-        public int ContractType { get; set; }
+        public int? ContractType { get; set; }
 
         [NotMapped]
         public bool TFA_Enabled { get; set; } = false;
@@ -70,14 +70,14 @@ namespace EnvelopeGenerator.Domain.Entities
         [NotMapped]
         public int ExpiresWhenDays
         {
-            get => ExpiresDays;
+            get => ExpiresDays ?? 0;
             set => ExpiresDays = value;
         }
 
         [NotMapped]
         public int ExpiresWarningWhenDays
         {
-            get => ExpiresWarningDays;
+            get => ExpiresWarningDays ?? 0;
             set => ExpiresWarningDays = value;
         }
 
@@ -86,4 +86,4 @@ namespace EnvelopeGenerator.Domain.Entities
             return Title;
         }
     }
-}
+}