Fix stale cmd/ scripts, export LoginWithChromedp, clean up vet warnings

Update 5 cmd/ test utilities that referenced APIs that drifted after
bridge refactors (NewBrowserAuthManager, bridge.NewConfig, changed
function signatures). Rewrite test-kosmi and test-native to use
NewGraphQLWSClient directly. Export LoginWithChromedp for use by cmd
scripts. Fix redundant-newline vet warnings across 5 cmd/ files.
Remove unreachable code and replace deprecated ioutil calls in
bridge/helper/lottie_convert.go.

Made-with: Cursor

cmd/test-kosmi/main.go

@@ -0,0 +1,90 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"os/signal"
+	"regexp"
+	"strings"
+	"syscall"
+	"time"
+
+	bkosmi "github.com/42wim/matterbridge/bridge/kosmi"
+	"github.com/sirupsen/logrus"
+)
+
+func main() {
+	roomURL := flag.String("room", "https://app.kosmi.io/room/@hyperspaceout", "Kosmi room URL")
+	debug := flag.Bool("debug", false, "Enable debug logging")
+	flag.Parse()
+
+	log := logrus.New()
+	if *debug {
+		log.SetLevel(logrus.DebugLevel)
+	} else {
+		log.SetLevel(logrus.InfoLevel)
+	}
+	log.SetFormatter(&logrus.TextFormatter{FullTimestamp: true})
+
+	logger := log.WithField("bridge", "kosmi-test")
+
+	logger.Info("Starting Kosmi bridge test")
+	logger.Infof("Room URL: %s", *roomURL)
+
+	roomID, err := extractRoomID(*roomURL)
+	if err != nil {
+		logger.Fatalf("Failed to extract room ID: %v", err)
+	}
+
+	// Empty token = anonymous access
+	client := bkosmi.NewGraphQLWSClient(*roomURL, roomID, "", logger)
+
+	client.OnMessage(func(payload *bkosmi.NewMessagePayload) {
+		username := payload.Data.NewMessage.User.DisplayName
+		if username == "" {
+			username = payload.Data.NewMessage.User.Username
+		}
+		ts := time.Unix(payload.Data.NewMessage.Time, 0)
+		logger.Infof("Received message: [%s] %s: %s",
+			ts.Format("15:04:05"), username, payload.Data.NewMessage.Body)
+	})
+
+	logger.Info("Connecting to Kosmi...")
+	if err := client.Connect(); err != nil {
+		logger.Fatalf("Failed to connect to Kosmi: %v", err)
+	}
+	logger.Info("Successfully connected to Kosmi!")
+
+	logger.Info("Listening for messages... Press Ctrl+C to exit")
+	sigChan := make(chan os.Signal, 1)
+	signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
+
+	go func() {
+		time.Sleep(5 * time.Second)
+		logger.Info("Bridge is running. Messages from Kosmi will appear above.")
+	}()
+
+	<-sigChan
+	logger.Info("Shutting down...")
+
+	if err := client.Disconnect(); err != nil {
+		logger.Errorf("Error disconnecting: %v", err)
+	}
+
+	logger.Info("Goodbye!")
+}
+
+func extractRoomID(url string) (string, error) {
+	url = strings.TrimSuffix(url, "/")
+	re := regexp.MustCompile(`/room/(@?[a-zA-Z0-9_-]+)`)
+	matches := re.FindStringSubmatch(url)
+	if len(matches) >= 2 {
+		roomID := matches[1]
+		if !strings.HasPrefix(roomID, "@") {
+			roomID = "@" + roomID
+		}
+		return roomID, nil
+	}
+	return "", fmt.Errorf("could not extract room ID from URL: %s", url)
+}