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/useModal.ts

@@ -0,0 +1,33 @@
+// Copyright 2017-2025 @polkadot/react-hooks authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { ModalState } from './types.js';
+
+import { useCallback } from 'react';
+
+import { createNamedHook } from './createNamedHook.js';
+import { useToggle } from './useToggle.js';
+
+function useModalImpl (defaultIsOpen?: boolean, onOpen?: () => void, onClose?: () => void): ModalState {
+  const [isOpen, , setIsOpen] = useToggle(defaultIsOpen || false);
+  const _onOpen = useCallback(
+    (): void => {
+      setIsOpen(true);
+
+      onOpen && onOpen();
+    },
+    [onOpen, setIsOpen]
+  );
+  const _onClose = useCallback(
+    (): void => {
+      setIsOpen(false);
+
+      onClose && onClose();
+    },
+    [onClose, setIsOpen]
+  );
+
+  return { isOpen, onClose: _onClose, onOpen: _onOpen };
+}
+
+export const useModal = createNamedHook('useModal', useModalImpl);