Fix all CS1591 XML documentation warnings

Added /// <inheritdoc/> comments to ActualX, ActualY, ActualWidth, and
ActualHeight properties in 8 control classes:
- ButtonControl
- CheckboxControl
- DropdownControl (both main class and DropdownPortalContent)
- ListControl
- MenuControl (including MenuItem class)
- MultilineEditControl
- PromptControl
- TreeControl

These properties implement IWindowControl interface which already has
full XML documentation. Using inheritdoc avoids duplication and ensures
documentation stays synchronized with the interface.

Build now succeeds with 0 warnings.

Author: nickprotop

SharpConsoleUI/Controls/ButtonControl.cs

@@ -51,9 +51,13 @@ public ButtonControl()
 		/// </summary>
 		public int? ContentWidth => GetButtonWidth() + _margin.Left + _margin.Right;
 
+		/// <inheritdoc/>
 		public int ActualX => _actualX;
+		/// <inheritdoc/>
 		public int ActualY => _actualY;
+		/// <inheritdoc/>
 		public int ActualWidth => _actualWidth;
+		/// <inheritdoc/>
 		public int ActualHeight => _actualHeight;
 
 		private int GetButtonWidth()

SharpConsoleUI/Controls/CheckboxControl.cs

@@ -101,9 +101,13 @@ public CheckboxControl(string label = "Checkbox", bool isChecked = false)
 		/// </summary>
 		public int? ContentWidth => GetCheckboxWidth() + _margin.Left + _margin.Right;
 
+		/// <inheritdoc/>
 		public int ActualX => _actualX;
+		/// <inheritdoc/>
 		public int ActualY => _actualY;
+		/// <inheritdoc/>
 		public int ActualWidth => _actualWidth;
+		/// <inheritdoc/>
 		public int ActualHeight => _actualHeight;
 
 		private int GetCheckboxWidth()

SharpConsoleUI/Controls/DropdownControl.cs

@@ -221,9 +221,13 @@ public int? ContentWidth
 			}
 		}
 
+		/// <inheritdoc/>
 		public int ActualX => _actualX;
+		/// <inheritdoc/>
 		public int ActualY => _actualY;
+		/// <inheritdoc/>
 		public int ActualWidth => _actualWidth;
+		/// <inheritdoc/>
 		public int ActualHeight => _actualHeight;
 
 		/// <inheritdoc/>
@@ -1808,9 +1812,13 @@ public bool ProcessMouseEvent(MouseEventArgs args)
 		public int? ContentWidth => _owner.GetPortalBounds().Width;
 		public int? ContentHeight => _owner.GetPortalBounds().Height;
 
+		/// <inheritdoc/>
 		public int ActualX => _actualX;
+		/// <inheritdoc/>
 		public int ActualY => _actualY;
+		/// <inheritdoc/>
 		public int ActualWidth => _actualWidth;
+		/// <inheritdoc/>
 		public int ActualHeight => _actualHeight;
 
 		public HorizontalAlignment HorizontalAlignment { get; set; } = HorizontalAlignment.Left;

SharpConsoleUI/Controls/ListControl.cs

@@ -393,9 +393,13 @@ public int? ContentWidth
 			}
 		}
 
+		/// <inheritdoc/>
 		public int ActualX => _actualX;
+		/// <inheritdoc/>
 		public int ActualY => _actualY;
+		/// <inheritdoc/>
 		public int ActualWidth => _actualWidth;
+		/// <inheritdoc/>
 		public int ActualHeight => _actualHeight;
 
 		/// <inheritdoc/>

SharpConsoleUI/Controls/MenuControl.cs

@@ -295,9 +295,13 @@ public int? Width
     /// <inheritdoc/>
     public int? ContentWidth => null;
 
+    /// <inheritdoc/>
     public int ActualX => _actualX;
+    /// <inheritdoc/>
     public int ActualY => _actualY;
+    /// <inheritdoc/>
     public int ActualWidth => _actualWidth;
+    /// <inheritdoc/>
     public int ActualHeight => _actualHeight;
 
     /// <inheritdoc/>
@@ -2309,9 +2313,13 @@ public bool ProcessMouseEvent(MouseEventArgs args)
     // IWindowControl minimal implementation
     public int? ContentWidth => _dropdown.Bounds.Width;
     public int? ContentHeight => _dropdown.Bounds.Height;
+    /// <inheritdoc/>
     public int ActualX => _actualX;
+    /// <inheritdoc/>
     public int ActualY => _actualY;
+    /// <inheritdoc/>
     public int ActualWidth => _actualWidth;
+    /// <inheritdoc/>
     public int ActualHeight => _actualHeight;
     public HorizontalAlignment HorizontalAlignment { get; set; } = HorizontalAlignment.Left;
     public VerticalAlignment VerticalAlignment { get; set; } = VerticalAlignment.Top;

SharpConsoleUI/Controls/MultilineEditControl.cs

@@ -156,9 +156,13 @@ public int? ContentWidth
 			}
 		}
 
+		/// <inheritdoc/>
 		public int ActualX => _actualX;
+		/// <inheritdoc/>
 		public int ActualY => _actualY;
+		/// <inheritdoc/>
 		public int ActualWidth => _actualWidth;
+		/// <inheritdoc/>
 		public int ActualHeight => _actualHeight;
 
 		/// <summary>

SharpConsoleUI/Controls/PromptControl.cs

@@ -79,9 +79,13 @@ public int? ContentWidth
 			}
 		}
 
+		/// <inheritdoc/>
 		public int ActualX => _actualX;
+		/// <inheritdoc/>
 		public int ActualY => _actualY;
+		/// <inheritdoc/>
 		public int ActualWidth => _actualWidth;
+		/// <inheritdoc/>
 		public int ActualHeight => _actualHeight;
 
 		/// <inheritdoc/>

SharpConsoleUI/Controls/TreeControl.cs

@@ -96,9 +96,13 @@ public int? ContentWidth
 			}
 		}
 
+		/// <inheritdoc/>
 		public int ActualX => _actualX;
+		/// <inheritdoc/>
 		public int ActualY => _actualY;
+		/// <inheritdoc/>
 		public int ActualWidth => _actualWidth;
+		/// <inheritdoc/>
 		public int ActualHeight => _actualHeight;
 
 		/// <inheritdoc/>