Add end-to-end testing with Playwright and TypeScript and developer CLI command

[tjementum]

Summary & motivation

Add a complete Playwright with TypeScript end-to-end testing framework to enable automated testing of user workflows across the application. The implementation includes comprehensive test coverage for the signup flow to demonstrate how end-to-end tests should be structured, but it does not provide complete coverage for all use cases.

• Create End2EndTests project with Playwright configuration and TypeScript support
• Add e2e CLI command with browser selection, filtering, and debugging options to easily run end-to-end tests
• Implement comprehensive signup test suite with 21 tests covering smoke, comprehensive, and slow scenarios
• Add test utilities for monitoring console messages, network errors, and toast notifications
• Include VS Code integration for debugging and test development
• Add AI workflow documentation for creating end-to-end tests

Downstream projects

1. Add the End2EndTests project to your solution file:

  <Solution>
    <!-- existing projects -->
+   <Project Path="End2EndTests\End2EndTests.esproj" />
  </Solution>

Checklist

• I have added tests, or done manual regression tests
• I have updated the documentation, if necessary

[sonarqubecloud]

Quality Gate failed

Failed conditions
4.8% Duplication on New Code (required ≤ 3%)
C Reliability Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

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