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/test-support/src/utils/renderedScreenUtils.ts

@@ -0,0 +1,28 @@
+// Copyright 2017-2026 @pezkuwi/test-supports authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+/* global expect */
+
+import { fireEvent, screen } from '@testing-library/react';
+
+export const clickButton = async (buttonName: string): Promise<void> => {
+  const button = await screen.findByRole('button', { name: buttonName });
+
+  fireEvent.click(button);
+};
+
+export const assertText = async (text: string): Promise<HTMLElement> => {
+  return screen.findByText(text);
+};
+
+export const fillInput = (inputTestId: string, value: string): void => {
+  const nameInput = screen.getByTestId(inputTestId);
+
+  fireEvent.change(nameInput, { target: { value } });
+};
+
+export const assertButtonDisabled = (buttonName: string): void => {
+  const button = screen.getByRole('button', { name: buttonName });
+
+  expect(button).toHaveClass('isDisabled');
+};