Try to cleanup clients even if the stream is dead.

Hope Gemini 3.5 Pro is not lying to me :P

main.go

@@ -221,6 +221,11 @@ func clientHandler(w http.ResponseWriter, r *http.Request) {
 	ch := NewClientChannel(name)
 	defer ch.Close()
 	for {
+		select {
+		case <-r.Context().Done():
+			fmt.Printf("Connection to client %s closed. Cleanup the channel.\n", remote)
+		default:
+		}
 		chunk := <-ch.Data
 		_, err := w.Write(chunk)
 		if err != nil {