Playwright template CI depends on public website load completing within 30 seconds #7601

Summary

The macOS pipeline can fail when the Playwright template test navigates to the public playwright.dev website and waits for its load event. A network or website delay fails the repository CI even when the template builds and the engine tests pass.

Reproduction

Observed in macOS job 126730039080, head 0619738. Run the Release Playwright template project. src/TUnit.Templates/content/TUnit.Playwright/Tests.cs:11 calls navigation to https://playwright.dev/; it exceeded the 30,000 ms timeout waiting for load. One of two tests failed.

Expected and actual

Expected: template CI verifies the browser and assertions reliably. Actual: availability and load time of a public website determine CI success. Make template validation deterministic, for example by serving local test content while retaining useful template examples.

Environment

GitHub Actions macos-latest, Release/net10.0, arm64. Found while validating #7569.