fix(hub): make root-folder save success/failure actually visible

Flagged directly: "Saving" ran for a few seconds then just stopped, with
nothing telling the operator whether it had worked. Both outcomes used
the same dim .settings-hint styling, so a real failure and a real success
looked identical at a glance. Success and failure are now tracked
separately (previously one plain string held either) and rendered with
the same success-msg/error-msg styling already used elsewhere on this
page, so which one happened is unambiguous.

0 files changed, 0 insertions, 0 deletions