- Fix chevron tooltip: was "Open folder" in both branches; now shows
"No subfolders" when the entry has no children (consistent with the
existing opacity-45 visual cue on the same chevron icon)
- Fix Unix breadcrumb root label: was always "Home" even for non-home
paths like /mnt/data — now labelled "/" which is always accurate
- Fix partial-failure staging: on a mixed add result, successfully-added
entries are now removed from the staging panel so only genuinely failed
folders remain for the user to retry (index-pairing is safe because the
backend returns results in input order via a preserved .map())
Replace native add-folder dialogs with an in-app folder picker that supports collecting folders from multiple locations before adding them together.
Add backend directory listing and batch add commands with duplicate skipping, plus store actions and a themed picker UI with a dedicated folders-to-add panel.
LyAhn