Fontos kezelési javítások

src/WorkFlowCheck.Web/Helpers/AspForDataTypeTagHelper.cs

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+using Microsoft.AspNetCore.Mvc.ViewFeatures;
+using Microsoft.AspNetCore.Razor.TagHelpers;
+
+namespace WorkFlowCheck.Web.Helpers
+{
+    [HtmlTargetElement("input", Attributes = "asp-for-datatype")]
+    public class AspForDataTypeTagHelper : TagHelper
+    {
+        [HtmlAttributeName("asp-for-datatype")]
+        public ModelExpression For { get; set; }
+
+        public override void Process(TagHelperContext context, TagHelperOutput output)
+        {
+            if (For == null) return;
+
+            var type = For.ModelExplorer.ModelType;
+
+            string dataType = GetDataTypeString(type);
+            output.Attributes.SetAttribute("data-type", dataType);
+        }
+
+        private string GetDataTypeString(Type type)
+        {
+            // Nullable<T> esetén nyerjük ki az alaptípust
+            if (Nullable.GetUnderlyingType(type) is Type underlyingType)
+            {
+                type = underlyingType;
+            }
+
+            if (type == typeof(string)) return "string";
+            if (type == typeof(int) || type == typeof(long) || type == typeof(float) ||
+                type == typeof(double) || type == typeof(decimal)) return "number";
+            if (type == typeof(bool)) return "bool";
+            if (type == typeof(DateTime)) return "date";
+
+            return "string"; // default fallback
+        }
+
+    }
+}