Add Pezkuwi SDK UI - Polkadot.js Apps clone

- Clone Polkadot.js Apps repository
- Update package.json with Pezkuwi branding
- Add Pezkuwi endpoint to production chains (wss://pezkuwichain.app:9944)
- Create comprehensive README for SDK UI
- Set up project structure with all packages

Next steps:
- Apply Kurdistan colors (Kesk, Sor, Zer, Spi + Black) to UI theme
- Replace logos with Pezkuwi branding
- Test build and deployment

pezkuwi-sdk-ui/packages/react-components/src/ButtonCancel.tsx

@@ -0,0 +1,32 @@
+// Copyright 2017-2025 @polkadot/react-components authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import React from 'react';
+
+import Button from './Button/index.js';
+import { useTranslation } from './translate.js';
+
+interface Props {
+  className?: string;
+  isDisabled?: boolean;
+  label?: string;
+  onClick: () => void;
+  tabIndex?: number;
+}
+
+function ButtonCancel ({ className = '', isDisabled, label, onClick, tabIndex }: Props): React.ReactElement<Props> {
+  const { t } = useTranslation();
+
+  return (
+    <Button
+      className={className}
+      icon='times'
+      isDisabled={isDisabled}
+      label={label || t('Cancel')}
+      onClick={onClick}
+      tabIndex={tabIndex}
+    />
+  );
+}
+
+export default React.memo(ButtonCancel);