fix(mindspace): sync nested OA files and count workspace assets

Recursive workspace sync now imports files in oa/private/public subfolders,
references workspace paths without duplicating storage, and includes
workspace-sourced assets in category itemCount. Refresh counts when leaving
a category view.

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

src/components/MindSpaceView.tsx

@@ -755,6 +755,7 @@ export function MindSpaceView({
     setPendingDeleteId(null);
     setSelectedAssetIds([]);
     setImagePage(0);
+    void refreshSpaceQuietly();
     routeSync?.pushHome();
   };