feat: / filters the account pane

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

internal/ui/app/help.go

@@ -47,7 +47,7 @@ func (c contextHelp) ShortHelp() []key.Binding {
 	}
 	if c.focus == paneDetail && c.account {
 		copyField := key.NewBinding(key.WithKeys(k.Copy.Keys()...), key.WithHelp(k.Copy.Help().Key, "copy"))
-		return append(b, k.Up, k.Down, copyField, k.Help, k.Quit)
+		return append(b, k.Up, k.Down, copyField, k.Filter, k.Help, k.Quit)
 	}
 	switch c.focus {
 	case paneSources: