Initial commit: Pezkuwi SDK UI

Comprehensive web interface for interacting with Pezkuwi blockchain.

Features:
- Blockchain explorer
- Wallet management
- Staking interface
- Governance participation
- Developer tools

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/react-hooks/src/useNonZeroBn.ts

@@ -0,0 +1,24 @@
+// Copyright 2017-2026 @pezkuwi/react-hooks authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import type { BN } from '@pezkuwi/util';
+import type { FormField } from './useFormField.js';
+
+import { useMemo } from 'react';
+
+import { BN_ZERO, bnToBn } from '@pezkuwi/util';
+
+import { createNamedHook } from './createNamedHook.js';
+import { useFormField } from './useFormField.js';
+
+function isValid (value: BN): boolean {
+  return !value.isZero();
+}
+
+function useNonZeroBnImpl (initialValue: BN | number = BN_ZERO): FormField<BN> {
+  const value = useMemo(() => bnToBn(initialValue), [initialValue]);
+
+  return useFormField(value, isValid);
+}
+
+export const useNonZeroBn = createNamedHook('useNonZeroBn', useNonZeroBnImpl);