Remove redundant stream utility helpers

internal/browser.go

@@ -0,0 +1,14 @@
+package internal
+
+import (
+	"errors"
+	"os/exec"
+)
+
+// openBrowser tries to open the embed URL in the system browser.
+func openBrowser(link string) error {
+	if link == "" {
+		return errors.New("empty URL")
+	}
+	return exec.Command("xdg-open", link).Start()
+}