External folder scan now mirrors disk subfolder structure into the folder
tree instead of flattening all files into root. Hidden directories are
filtered, orphaned subfolders are cleaned up on rescan. Fixes#890.
File manager delete endpoints (folder, file, bulk) now commit before
returning the response — previously relied on post-response auto-commit,
causing a race where the frontend refetch arrived before the commit.
maziggy
1645b51dad