Fix CI failures from Playwright 1.56.1 upgrade

[Copilot]

Playwright 1.56.1 requires browser binaries to be installed separately, causing CI test failures. Browser downloads are currently failing due to Azure CDN issues affecting npx playwright install.

Changes

• Use official Playwright Docker container (mcr.microsoft.com/playwright:v1.56.1-noble) in GitHub Actions workflow
• Remove browser installation step (pre-installed in container)

This is the recommended approach for CI environments and avoids network-dependent installation steps.

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

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:

• esm.ubuntu.com
  • Triggering command: /usr/lib/apt/methods/https (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)