fix: print docker output in network error and use networkName constant

The network creation error format string had a trailing "output" with no
verb, silently dropping the captured docker output. Add the missing %s.
Also replace the hardcoded "app-dono_app" literal with the networkName
constant in RunAppClienteContainer.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

internal/tui/docker.go

@@ -56,7 +56,7 @@ func EnsureNetwork(name string) error {
 	cmd = exec.Command("docker", "network", "create", name)
 	out, err := cmd.CombinedOutput()
 	if err != nil {
-		return fmt.Errorf("erro ao criar network %s: %w\noutput", name, err, string(out))
+		return fmt.Errorf("erro ao criar network %s: %w\noutput: %s", name, err, string(out))
 	}
 	return nil
 }
@@ -125,7 +125,7 @@ func RunAppClienteContainer(image, containerName, configPath, configDestinationP
 		"-u", uidGid,
 		"-p", fmt.Sprintf("%s:8080", cv.Server["port"]),
 		"--name", containerName,
-		"--network", "app-dono_app",
+		"--network", networkName,
 		"--restart", "unless-stopped",
 		"-v", fmt.Sprintf("%s:%s", absPath, configDestinationPath),
 		"-v", fmt.Sprintf("%s:/app/certs", cv.Cert["cert_dir_path"]),