`>` narrows to commands from the live keymap for the current mode, matched
on the action's help_label only — the chord is displayed, never matched, so
results cannot depend on a user's rebinds. Rows dedupe by action, not by
chord: the default map binds both `enter` and `tab` to AttachHighlighted,
and AttachHighlighted and ToggleAttachHighlighted share a label because they
are the same match arm.
`~` narrows to recent dirs plus the project list. Enter takes the
fast-forward path pinned to that directory, with no recency fallback, so a
directory outside the project scan opens the pre-filled form rather than
spawning elsewhere.
Both fall out of parsing the query line, as in web/src/commandBar.ts: a
sigil is only a sigil in first position, and backspacing past one is just
the query becoming mixed again.