Show the window before slow location probes and wrap git.exe for commit, diff, and merge.

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

src/Explorer.Presentation/ViewModels/NavigationTreeViewModel.cs

@@ -53,6 +53,24 @@ public sealed class NavigationTreeViewModel
 
     public bool IsRevealing { get; private set; }
 
+    public void PreparePlaceholder()
+    {
+        if (Roots.Count > 0)
+        {
+            return;
+        }
+
+        Roots.Add(new NavNodeViewModel
+        {
+            Label = LocationRoots.ThisPc,
+            Path = LocationRoots.ThisPc,
+            Glyph = "\uE977",
+            IsExpanded = true,
+            ChildrenLoaded = true,
+            IsGroup = true
+        });
+    }
+
     public async Task ReloadAsync(string? revealPath = null, CancellationToken cancellationToken = default)
     {
         var expanded = new List<string>();