feat: add back to lobby navigation on game pages

ui/lobby.go

@@ -25,6 +25,10 @@ type LobbyProps struct {
 	SpeedSelectClicks   []h.H
 }
 
+func BackToLobby() h.H {
+	return h.A(h.Class("link text-sm opacity-70"), h.Href("/"), h.Text("← Back to Lobby"))
+}
+
 func LobbyView(p LobbyProps) h.H {
 	var authSection h.H
 	if p.IsLoggedIn {