fix(all): stabilize login and proxy-aware game startup

go/internal/client/app/platform_darwin.go

@@ -25,6 +25,16 @@ func launchGame(target string) error {
 	if err := exec.Command("pgrep", "-x", "BrownDust II").Run(); err == nil {
 		return errGameAlreadyRunning
 	}
-	args := append([]string{target, "--args"}, gameLaunchArguments()...)
+	// LaunchServices does not inherit open's environment; --env explicitly
+	// supplies the Unity variables to the newly launched application.
+	args := []string{target}
+	for _, entry := range gameProxyEnvironment(os.Environ(), systemGameProxy()) {
+		key, _, found := strings.Cut(entry, "=")
+		if found && (strings.EqualFold(key, "UNITY_PROXYSERVER") || strings.EqualFold(key, "UNITY_NOPROXY")) {
+			args = append(args, "--env", entry)
+		}
+	}
+	args = append(args, "--args")
+	args = append(args, gameLaunchArguments()...)
 	return exec.Command("open", args...).Start()
 }