feat: add proxy labels and default profiles

internal/domain/browser.go

@@ -104,6 +104,16 @@ func NormalizeProxyServer(value string) (string, error) {
 	return scheme + "://" + net.JoinHostPort(strings.ToLower(parsed.Hostname()), strconv.Itoa(port)), nil
 }
 
+// NormalizeProxyName returns a non-empty display name for a locally saved
+// proxy profile. It deliberately carries no endpoint or credentials semantics.
+func NormalizeProxyName(value string) (string, error) {
+	name := strings.TrimSpace(value)
+	if name == "" {
+		return "", fmt.Errorf("%w: proxy name is required", ErrInvalidLaunchSpec)
+	}
+	return name, nil
+}
+
 func ValidRemoteDebugPort(port int) bool {
 	return port >= MinRemoteDebugPort && port <= MaxRemoteDebugPort
 }