Add project files.

ConstructorAppUI/Helpers/EnumExtensions.cs

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+using System.ComponentModel.DataAnnotations;
+using System.Reflection;
+
+namespace ConstructorAppUI.Helpers
+{
+    public static class EnumExtensions
+    {
+        public static string GetDisplayName(this Enum enumValue)
+        {
+            return enumValue
+                .GetType()
+                .GetMember(enumValue.ToString())
+                .First()
+                .GetCustomAttribute<DisplayAttribute>()?
+                .GetName() ?? enumValue.ToString();
+        }
+    }
+}

ConstructorAppUI/Helpers/YouTubeHelper.cs

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+namespace ConstructorAppUI.Helpers
+{
+    public static class YouTubeHelper
+    {
+        public static string? ExtractVideoId(string url)
+        {
+            if (string.IsNullOrEmpty(url))
+                return null;
+
+            try
+            {
+                // 1. URL parametreleri ile  
+                if (url.Contains("youtube.com/watch"))
+                {
+                    var uri = new Uri(url);
+                    var query = System.Web.HttpUtility.ParseQueryString(uri.Query);
+                    return query["v"];
+                }
+                // 2. kısa link olan youtu.be  
+                if (url.Contains("youtu.be/"))
+                {
+                    var parts = url.Split(new[] { "youtu.be/" }, StringSplitOptions.RemoveEmptyEntries);
+                    if (parts.Length > 1)
+                    {
+                        var idPart = parts[1];
+                        var ampIndex = idPart.IndexOf('&');
+                        if (ampIndex >= 0)
+                            idPart = idPart.Substring(0, ampIndex);
+                        return idPart;
+                    }
+                }
+                // 3. embed url  
+                if (url.Contains("youtube.com/embed/"))
+                {
+                    var parts = url.Split(new[] { "youtube.com/embed/" }, StringSplitOptions.RemoveEmptyEntries);
+                    if (parts.Length > 1)
+                    {
+                        var idPart = parts[1];
+                        var slashIndex = idPart.IndexOfAny(new[] { '/', '?' });
+                        if (slashIndex >= 0)
+                            idPart = idPart.Substring(0, slashIndex);
+                        return idPart;
+                    }
+                }
+                // 4. Eğer sadece ID ise, uzunluk 11 ise  
+                if (url.Length == 11 && !url.Contains("youtube"))
+                    return url;
+            }
+            catch { }
+            return null;
+        }
+}
+}