MainWindow: Delay email sending

Elwig/Helpers/Config.cs

@@ -57,9 +57,10 @@ namespace Elwig.Helpers {
         public string? SmtpUsername = null;
         public string? SmtpPassword = null;
         public string? SmtpFrom = null;
-        public (string Host, int Port, string Mode, string Username, string Password, string From)? Smtp =>
+        public double SmtpWait = 0;
+        public (string Host, int Port, string Mode, string Username, string Password, string From, double Wait)? Smtp =>
             SmtpHost == null || SmtpPort == null || SmtpMode == null || SmtpUsername == null || SmtpPassword == null || SmtpFrom == null ?
-            null : (SmtpHost, (int)SmtpPort, SmtpMode, SmtpUsername, SmtpPassword, SmtpFrom);
+            null : (SmtpHost, (int)SmtpPort, SmtpMode, SmtpUsername, SmtpPassword, SmtpFrom, SmtpWait);
 
         public IList<ScaleConfig> Scales;
         private readonly List<ScaleConfig> ScaleList = [];
@@ -92,6 +93,7 @@ namespace Elwig.Helpers {
             SmtpUsername = config["smtp:username"];
             SmtpPassword = config["smtp:password"];
             SmtpFrom = config["smtp:from"];
+            SmtpWait = double.TryParse(config["smtp:wait"], out var res) ? res : 0;
 
             var scales = config.AsEnumerable().Where(i => i.Key.StartsWith("scale.")).GroupBy(i => i.Key.Split(':')[0][6..]).Select(i => i.Key).Order();
             ScaleList.Clear();