Add integration tests for build system and HTML page loading

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This PR adds comprehensive integration tests for the browserLegacy repository to validate the JavaScript build/compression process and HTML page loading functionality.

Changes Made

Testing Infrastructure

• Added Jest testing framework with appropriate configuration
• Created tests/integration/ directory structure
• Added npm test scripts: npm test and npm run test:integration

Build System Integration Tests (tests/integration/build.test.js)

• JavaScript Build Process: Tests compilation of ThreadEventHandler and GrfViewer applications
• Compression/Minification: Validates minified builds contain required components (headers, require.js)
• Build Validation: Checks builder configuration and output file format
• Output Verification: Ensures generated files exist and have expected content

HTML Loading Integration Tests (tests/integration/html-loading.test.js)

• HTML Structure Validation: Tests main index.html, test pages, and build tool interface
• Configuration Validation: Validates ROConfig object and RequireJS configurations
• Resource Loading: Confirms JavaScript dependencies exist and core modules follow AMD structure
• Integration Completeness: Verifies test HTML files reference valid modules

Key Features

• 13 comprehensive test cases covering both build and loading functionality
• Extended timeouts (60s) for build operations to handle large compilation processes
• Proper cleanup to avoid committing build artifacts (dist/ directory)
• Detailed documentation in tests/integration/README.md

Usage

npm test                    # Run all tests
npm run test:integration    # Run integration tests only
npx jest tests/integration/build.test.js  # Run specific test suite

The tests validate that:

• Build system can successfully compile and minify JavaScript applications
• HTML pages have correct structure and valid configurations
• All required dependencies and modules are present and properly structured
• Generated build artifacts contain expected headers and functionality

All tests pass successfully, providing confidence in the build system and page loading functionality.

Fixes #1.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• dl.nwjs.io
  • Triggering command: node src/postinstall.js (dns block)
• edgedl.me.gvt1.com
  • Triggering command: node install.mjs (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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