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/formatNumber.spec.ts

@@ -0,0 +1,60 @@
+// Copyright 2017-2025 @polkadot/util authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+/// <reference types="@polkadot/dev-test/globals.d.ts" />
+
+import { BN } from '../bn/index.js';
+import { formatNumber } from './index.js';
+
+describe('formatNumber', (): void => {
+  it('formats empty', (): void => {
+    expect(
+      formatNumber()
+    ).toEqual('0');
+  });
+
+  it('formats negative numbers', (): void => {
+    expect(
+      formatNumber(-123456)
+    ).toEqual('-123,456');
+  });
+
+  it('formats BN numbers', (): void => {
+    expect(
+      formatNumber(new BN(12345))
+    ).toEqual('12,345');
+  });
+
+  it('formats BigInt numbers', (): void => {
+    expect(
+      formatNumber(123456789n)
+    ).toEqual('123,456,789');
+  });
+
+  it('formats Compact<BN>', (): void => {
+    expect(
+      formatNumber({
+        toBn: (): BN => new BN(12345),
+        unwrap: (): BN => new BN(0)
+      })
+    ).toEqual('12,345');
+  });
+
+  it('formats negative numbers (locale=sl)', (): void => {
+    expect(
+      formatNumber(-123456, { locale: 'sl' })
+    ).toEqual('-123.456');
+  });
+
+  it('formats BN numbers (locale=sl)', (): void => {
+    expect(
+      formatNumber(new BN(12345), { locale: 'sl' })
+    ).toEqual('12.345');
+  });
+
+  it('formats BigInt numbers (locale=sl)', (): void => {
+    expect(
+      formatNumber(123456789n, { locale: 'sl' })
+    ).toEqual('123.456.789');
+  });
+});