Initial rebrand: @polkadot -> @pezkuwi (14 packages)

- Package namespace: @polkadot/* -> @pezkuwi/*
- Repository: polkadot-js/common -> pezkuwichain/pezkuwi-common
- Author: Pezkuwi Team <team@pezkuwichain.io>

Core packages:
- @pezkuwi/util (utilities)
- @pezkuwi/util-crypto (crypto primitives)
- @pezkuwi/keyring (account management)
- @pezkuwi/networks (chain metadata)
- @pezkuwi/hw-ledger (Ledger hardware wallet)
- @pezkuwi/x-* (10 polyfill packages)

Total: 14 packages
Upstream: polkadot-js/common v14.0.1

packages/util/src/format/formatDecimal.spec.ts

@@ -0,0 +1,28 @@
+// Copyright 2017-2025 @polkadot/util authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+/// <reference types="@polkadot/dev-test/globals.d.ts" />
+
+import { formatDecimal } from './index.js';
+
+describe('formatDecimal', (): void => {
+  it('formats decimals in number groupings', (): void => {
+    expect(formatDecimal('12345')).toEqual('12,345');
+  });
+
+  it('formats decimal-only in number groupings', (): void => {
+    expect(formatDecimal('test6789')).toEqual('6,789');
+  });
+
+  it('returns input for non-decimal', (): void => {
+    expect(formatDecimal('test')).toEqual('test');
+  });
+
+  it('returns non-sensical negative text', (): void => {
+    expect(formatDecimal('-test')).toEqual('-test');
+  });
+
+  it('formats negative numbers', (): void => {
+    expect(formatDecimal('-123456')).toEqual('-123,456');
+  });
+});