has method
Check if URL is cached
Implementation
Future<bool> has(String cacheName, String url) async {
try {
final result = await _cacheHasJS(cacheName.toJS, url.toJS).toDart;
return result.toDart;
} catch (e) {
debugPrint('[WebCacheInterop] ❌ has failed for $url: $e');
return false;
}
}