Footer advertised `⌘↵ open in split` and `⇥ filter`, but neither is
plumbed through `on_command_overlay_key_down` — the dispatch only
handles up / down / enter. Per the no-fake-handlers rule a hint that
doesn't fire is worse than no hint, so trim the footer to just the
two shortcuts that actually work. The split/filter hints can come
back the moment the dispatch grows to handle them.
ZacharyZhang-NY
a6e08f6267