ModifiedAt for items, use it by default

src/Core/FileTime.Core.Abstraction/Models/IItem.cs

@@ -15,6 +15,7 @@ public interface IItem
     bool IsHidden { get; }
     bool IsExists { get; }
     DateTime? CreatedAt { get; }
+    DateTime? ModifiedAt { get; }
     SupportsDelete CanDelete { get; }
     bool CanRename { get; }
     IContentProvider Provider { get; }

src/Core/FileTime.Core.ContentAccess/ContentProviderBase.cs

@@ -34,6 +34,7 @@ public abstract class ContentProviderBase : IContentProvider
     public AbsolutePath? Parent { get; }
 
     public DateTime? CreatedAt => null;
+    public DateTime? ModifiedAt => null;
 
     public string? Attributes => null;
 

src/Core/FileTime.Core.ContentAccess/RootContentProvider.cs

@@ -18,6 +18,7 @@ public class RootContentProvider : IRootContentProvider
     public bool IsHidden => false;
     public bool IsExists => true;
     public DateTime? CreatedAt => null;
+    public DateTime? ModifiedAt => null;
     public SupportsDelete CanDelete => SupportsDelete.False;
     public bool CanRename => false;
     public IContentProvider Provider => this;

src/Core/FileTime.Core.Models/Container.cs

@@ -16,6 +16,7 @@ public record Container(
     bool IsHidden,
     bool IsExists,
     DateTime? CreatedAt,
+    DateTime? ModifiedAt,
     SupportsDelete CanDelete,
     bool CanRename,
     string? Attributes,

src/Core/FileTime.Core.Models/Element.cs

@@ -14,6 +14,7 @@ public record Element(
     bool IsHidden,
     bool IsExists,
     DateTime? CreatedAt,
+    DateTime? ModifiedAt,
     SupportsDelete CanDelete,
     bool CanRename,
     string? Attributes,