Add the Varbase E2E automated functional testing suite (1.0.x)

Problem/Motivation

Horizon Aid ships no automated functional testing suite: no browser tests prove the shipped canvas pages render, the navigation reaches every section, or the administrative surfaces stay closed to anonymous visitors. Every other Vardot site template and the Varbase projects run their suites on @vardot/varbase-e2e, the browser testing harness released from Vardot/varbase-e2e.

Steps to reproduce

Read the 1.0.x branch: there is no tests/ directory, no testing dependency in package.json, and no test job in the CI configuration.

Proposed resolution

• Add a Varbase E2E suite (Playwright + Cucumber-js) with three concerns: every shipped canvas page renders, the navigation and footer reach every section, and anonymous visitors are denied the administrative surfaces.
• Wire the suite into CI: build a Varbase 11 project, install the Horizon Aid recipe, and drive the site in the browser, one job per suite.
• Use only the harness's built-in steps — no custom step definitions to maintain.

Remaining tasks

• ✅ File an issue
• ❌ Addition/Change/Update/Fix
• ➖ Testing to ensure no regression
• ➖ Automated unit testing coverage
• ❌ Automated functional testing coverage
• ➖ UX/UI designer responsibilities
• ➖ Readability
• ➖ Accessibility
• ➖ Performance
• ➖ Security
• ❌ Developer Documentation
• ➖ User Guide Documentation
• ❌ Reviewed by human
• ❌ Code review by maintainers
• ➖ Full testing and approval
• ➖ Credit contributors
• ➖ Review with the product owner
• ❌ Release notes snippet
• ❌ Release

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• Added an automated functional testing suite on @vardot/varbase-e2e.