Keep the connection state in the status bar on /query (closes #235)

/query set the status bar to [connected] whatever the connection
state. Before /connect, it made the status bar say [connected] while
the client had no session.

/query now reads the connection state with the nick, as /window does,
and shows [connected] only while the client is connected,
[disconnected] otherwise. TestQueryConnectionState types /query bob,
connected and not, and checks the status bar. It names the two status
texts as constants, because the linter asks for one once a third copy
appears.

Model: opus-5-5

internal/cli/app.go

@@ -402,10 +402,16 @@ func (a *App) cmdQuery(nick string) {
 	a.mu.Lock()
 	a.target = nick
 	myNick := a.nick
+	connected := a.connected
 	a.mu.Unlock()
 
+	connStatus := "disconnected"
+	if connected {
+		connStatus = "connected"
+	}
+
 	a.ui.SwitchToBuffer(nick)
-	a.ui.SetStatus(myNick, nick, "connected")
+	a.ui.SetStatus(myNick, nick, connStatus)
 }
 
 func (a *App) cmdTopic(args string) {