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

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

src/Explorer.Application/StorageProviderRegistry.cs

@@ -188,25 +188,34 @@ public sealed class StorageProviderRegistry
             return null;
         }
     }
+
+    public async Task<ProviderQuota?> TryGetQuotaAsync(string rootPath, CancellationToken cancellationToken = default)
+    {
+        var provider = Find(rootPath);
+        if (provider is null)
+        {
+            return null;
+        }
+
+        try
+        {
+            return await provider.TryGetQuotaAsync(rootPath, cancellationToken).ConfigureAwait(false);
+        }
+        catch (Exception ex)
+        {
+            _logger.LogDebug(ex, "Provider {Id} failed reading quota for {Path}", provider.Manifest.Id, rootPath);
+            return null;
+        }
+    }
 }
 
 public static class CloudPresenceMapper
 {
     public static FileSystemItem Apply(FileSystemItem item, ProviderItemState state)
-        => new()
-        {
-            FullPath = item.FullPath,
-            Name = item.Name,
-            IsDirectory = item.IsDirectory,
-            SizeBytes = item.SizeBytes,
-            CreatedUtc = item.CreatedUtc,
-            ModifiedUtc = item.ModifiedUtc,
-            Attributes = item.Attributes,
-            FileId = item.FileId,
-            ReparseTag = item.ReparseTag,
-            AllocatedSizeBytes = state.AllocatedSizeBytes ?? item.AllocatedSizeBytes,
-            Cloud = ToPresence(state)
-        };
+        => item.Overlay(
+            allocatedSizeBytes: state.AllocatedSizeBytes ?? item.AllocatedSizeBytes,
+            cloud: ToPresence(state),
+            hydration: item.Hydration | ItemHydrationFlags.Provider);
 
     public static CloudPresence ToPresence(ProviderItemState state)
         => new(