Persist file categories on the index and classify archives and unknown types during idle maintenance.

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

src/Explorer.Indexing/FolderReconciler.cs

@@ -190,6 +190,9 @@ public sealed class FolderReconciler
             }
         }, cancellationToken).ConfigureAwait(false);
 
+        await _store.Entries.RefreshCategoryFromChildrenAsync(parent.Id, cancellationToken)
+            .ConfigureAwait(false);
+
         foreach (var path in archivesToTomb)
         {
             await _store.Entries.TombstoneByPathPrefixAsync(source.Id, path, now, cancellationToken)
@@ -202,6 +205,8 @@ public sealed class FolderReconciler
             {
                 await _archives.ExpandIfNeededAsync(source, archive, now, source.ScanGeneration, cancellationToken)
                     .ConfigureAwait(false);
+                await _store.Entries.RefreshCategoryFromChildrenAsync(archive.Id, cancellationToken)
+                    .ConfigureAwait(false);
             }
         }