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Type Alias Builder signature for the visual of CrossmintExportPrivateKeyButton. The widget owns the loading state and the eligibility check; the builder receives isLoading and onExport so the consumer can render any tap target that fits their design system. onExport is null while the export is in flight so a consumer button (e.g. ElevatedButton) is automatically disabled without a separate mounted check. 
typedef CrossmintExportPrivateKeyButtonBuilder = Widget Function( BuildContext context, { required bool isLoading, required VoidCallback? onExport, })