Add Git overlay, operation tools, and virtualized preview so large folders stay responsive.

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

tests/Explorer.Application.Tests/UiPreferencesStoreTests.cs

@@ -15,13 +15,32 @@ public class UiPreferencesStoreTests
             "group-network=true",
             "group-cloud=false",
             "index-archives=true",
-            "auto-clear-queue=true"
+            "auto-clear-queue=true",
+            "seven-zip=C:\\Program Files\\7-Zip\\7z.exe"
         ]);
         Assert.Equal("Light", prefs.Theme);
         Assert.True(prefs.GroupNetworkPlaces);
         Assert.False(prefs.GroupCloudPlaces);
         Assert.True(prefs.IndexArchiveContents);
         Assert.True(prefs.AutoClearQueueWhenDone);
+        Assert.Equal(@"C:\Program Files\7-Zip\7z.exe", prefs.SevenZipPath);
+        Assert.Null(prefs.GitPath);
+    }
+
+    [Fact]
+    public void Parse_reads_organize_destinations()
+    {
+        var prefs = UiPreferencesStore.Parse(["organize-installers=D:\\Software", "organize-pictures=D:\\Pictures"]);
+        Assert.Equal(@"D:\Software", prefs.OrganizeInstallers);
+        Assert.Equal(@"D:\Pictures", prefs.OrganizePictures);
+        Assert.Null(prefs.OrganizeArchives);
+    }
+
+    [Fact]
+    public void Parse_reads_git_path()
+    {
+        var prefs = UiPreferencesStore.Parse(["git=C:\\Program Files\\Git\\cmd\\git.exe"]);
+        Assert.Equal(@"C:\Program Files\Git\cmd\git.exe", prefs.GitPath);
     }
 
     [Fact]
@@ -35,6 +54,8 @@ public class UiPreferencesStoreTests
         Assert.True(prefs.ShowHiddenFiles);
         Assert.False(prefs.ShowProtectedSystemLocations);
         Assert.False(prefs.AutoClearQueueWhenDone);
+        Assert.Null(prefs.SevenZipPath);
+        Assert.Null(prefs.GitPath);
     }
 
     [Fact]
@@ -105,6 +126,31 @@ public class LocationVisibilityTests
         Assert.Equal(SizeKnowledge.Unknown, LocationVisibility.ResolveSizeKnowledge(info, true, 0, true));
         Assert.Equal(SizeKnowledge.Partial, LocationVisibility.ResolveSizeKnowledge(info, true, 1000, true));
     }
+
+    [Fact]
+    public void Recycle_bin_folder_is_never_shown()
+    {
+        var recycle = LocationClassifier.Classify(
+            @"C:\$RECYCLE.BIN", "$RECYCLE.BIN",
+            AttributeFlags.Directory | AttributeFlags.Hidden | AttributeFlags.System, true);
+        Assert.False(LocationVisibility.ShouldShow(recycle, UiPreferences.Default));
+        Assert.False(LocationVisibility.ShouldShow(recycle, UiPreferences.Default with
+        {
+            ShowHiddenFiles = true,
+            ShowProtectedSystemLocations = true
+        }));
+    }
+
+    [Fact]
+    public void Recycle_bin_summary_clamps_negative_query_values()
+    {
+        var summary = RecycleBinSummary.FromQuery(-12, -3);
+        Assert.Equal(0, summary.ItemCount);
+        Assert.Equal(0, summary.UsedBytes);
+        var ok = RecycleBinSummary.FromQuery(4096, 3);
+        Assert.Equal(3, ok.ItemCount);
+        Assert.Equal(4096, ok.UsedBytes);
+    }
 }
 
 file sealed class PrefsEnv : IAppEnvironment