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-hooks/src/useIsMountedRef.ts

@@ -0,0 +1,26 @@
+// Copyright 2017-2025 @polkadot/react-hooks authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type React from 'react';
+
+import { useEffect, useRef } from 'react';
+
+import { createNamedHook } from './createNamedHook.js';
+
+export type MountedRef = React.MutableRefObject<boolean>;
+
+function useIsMountedRefImpl (): MountedRef {
+  const isMounted = useRef(false);
+
+  useEffect((): () => void => {
+    isMounted.current = true;
+
+    return (): void => {
+      isMounted.current = false;
+    };
+  }, []);
+
+  return isMounted;
+}
+
+export const useIsMountedRef = createNamedHook('useIsMountedRef', useIsMountedRefImpl);