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>

tests/Explorer.Application.Tests/UiPreferencesStoreTests.cs

@@ -1,4 +1,5 @@
 using Explorer.Application;
+using Explorer.Domain;
 using Explorer.Domain.Abstractions;
 
 namespace Explorer.Application.Tests;
@@ -13,12 +14,14 @@ public class UiPreferencesStoreTests
             "theme=Light",
             "group-network=true",
             "group-cloud=false",
-            "index-archives=true"
+            "index-archives=true",
+            "auto-clear-queue=true"
         ]);
         Assert.Equal("Light", prefs.Theme);
         Assert.True(prefs.GroupNetworkPlaces);
         Assert.False(prefs.GroupCloudPlaces);
         Assert.True(prefs.IndexArchiveContents);
+        Assert.True(prefs.AutoClearQueueWhenDone);
     }
 
     [Fact]
@@ -29,6 +32,30 @@ public class UiPreferencesStoreTests
         Assert.False(prefs.GroupNetworkPlaces);
         Assert.False(prefs.GroupCloudPlaces);
         Assert.False(prefs.IndexArchiveContents);
+        Assert.True(prefs.ShowHiddenFiles);
+        Assert.False(prefs.ShowProtectedSystemLocations);
+        Assert.False(prefs.AutoClearQueueWhenDone);
+    }
+
+    [Fact]
+    public void Parse_reads_window_layout()
+    {
+        var prefs = UiPreferencesStore.Parse(
+        [
+            "theme=Dark",
+            "window-width=1440.5",
+            "window-height=900",
+            "window-left=12",
+            "window-top=24",
+            "window-maximized=true",
+            "tree-width=320"
+        ]);
+        Assert.Equal(1440.5, prefs.WindowWidth);
+        Assert.Equal(900, prefs.WindowHeight);
+        Assert.Equal(12, prefs.WindowLeft);
+        Assert.Equal(24, prefs.WindowTop);
+        Assert.True(prefs.WindowMaximized);
+        Assert.Equal(320, prefs.TreeWidth);
     }
 
     [Fact]
@@ -38,12 +65,18 @@ public class UiPreferencesStoreTests
         try
         {
             var store = new UiPreferencesStore(new PrefsEnv(dir));
-            store.Save(new UiPreferences("Light", true, false, true));
+            store.Save(new UiPreferences("Light", true, false, true, AutoClearQueueWhenDone: true, WindowWidth: 1100, WindowHeight: 720, TreeWidth: 300));
             var loaded = store.Load();
             Assert.Equal("Light", loaded.Theme);
             Assert.True(loaded.GroupNetworkPlaces);
             Assert.False(loaded.GroupCloudPlaces);
             Assert.True(loaded.IndexArchiveContents);
+            Assert.True(loaded.ShowHiddenFiles);
+            Assert.False(loaded.ShowProtectedSystemLocations);
+            Assert.True(loaded.AutoClearQueueWhenDone);
+            Assert.Equal(1100, loaded.WindowWidth);
+            Assert.Equal(720, loaded.WindowHeight);
+            Assert.Equal(300, loaded.TreeWidth);
         }
         finally
         {
@@ -52,6 +85,28 @@ public class UiPreferencesStoreTests
     }
 }
 
+public class LocationVisibilityTests
+{
+    [Fact]
+    public void Hides_protected_when_setting_is_off()
+    {
+        var prefs = UiPreferences.Default;
+        var svi = LocationClassifier.Classify(
+            @"C:\System Volume Information", "System Volume Information",
+            AttributeFlags.Directory | AttributeFlags.Hidden | AttributeFlags.System, true);
+        Assert.False(LocationVisibility.ShouldShow(svi, prefs));
+        Assert.True(LocationVisibility.ShouldShow(svi, prefs with { ShowProtectedSystemLocations = true }));
+    }
+
+    [Fact]
+    public void Unknown_size_when_access_denied_and_zero()
+    {
+        var info = new LocationInfo(true, true, true, true, false);
+        Assert.Equal(SizeKnowledge.Unknown, LocationVisibility.ResolveSizeKnowledge(info, true, 0, true));
+        Assert.Equal(SizeKnowledge.Partial, LocationVisibility.ResolveSizeKnowledge(info, true, 1000, true));
+    }
+}
+
 file sealed class PrefsEnv : IAppEnvironment
 {
     public PrefsEnv(string dir)