Improve file operations, layout memory, and drive status.

Add a sequential file-operations queue with pause, reorder, and optional auto-clear; persist window size and tree width; show free space; and clear leftover indexing status.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/Explorer.Windows/WindowsElevatedScanService.cs

@@ -0,0 +1,27 @@
+using System.Security.Principal;
+using Explorer.Application;
+
+namespace Explorer.Windows;
+
+public sealed class WindowsElevatedScanService : IElevatedScanService
+{
+    public bool IsElevated
+    {
+        get
+        {
+            try
+            {
+                using var identity = WindowsIdentity.GetCurrent();
+                return new WindowsPrincipal(identity).IsInRole(WindowsBuiltInRole.Administrator);
+            }
+            catch
+            {
+                return false;
+            }
+        }
+    }
+
+    public bool CanRequestElevation => false;
+
+    public string ProtectedContentHint => "Protected content requires administrator privileges.";
+}