scan_import_folder now returns ImportFolderScan { sources, root_files }:
the CSV/TXT files at the root, which no source reads, are named in a
warning on the Import page (above the source list, or under the "no
source" empty state). One action sets sources and root files, RESET keeps
both. Names stay on screen, never in the Journal.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
