The Send-Friend-Request action row in the Add Friend tab previously
appeared only when the typed query contained a non-edge @, leaving
no way to fire a blind request for a bare local handle. Widen the
gate to allow non-empty bare handles, keep the malformed @ shapes
(@, @bob, bob@) hidden. When the typed query has no @, display the
resolved form <query>@<window.location.host> so the user sees which
instance the request will hit. Submission string is unchanged.
Updates FriendsPage.test.tsx: inverts the now-stale 'does not show
Direct Add row for plain usernames' test into the new positive
assertion, and adds a separate test for the malformed @ shapes.
Jannis Braun
da98d78489