Add bash script demonstrating browser shell-wrapper pipe-hang bug (Brave + Chromium)

[Copilot]

• Reproduce current devcontainer build behavior and confirm failure point
• Update /home/runner/work/web-xforge/web-xforge/.devcontainer/Dockerfile to omit NodeSource setup while keeping Node.js install and Brave install in-container
• Rebuild devcontainer services (app, db) and verify container startup
• Run timeout 180 npm run test:headless ... only inside the devcontainer
• Share results and any remaining blockers

Original prompt

Frontend tests run but hang at the end. Even with --no-watch. Perhaps only in Ubuntu 24.04. When you try it out, I suggest you prefix the test run with timeout 180 so the test run is automatically killed when the timeout is succeeded.

Please reproduce the problem.
Please fix the problem so that the tests successfully finish and exit the process when completed (without needing to be killed by timeout).

To be clear, I want the following command to run and exit without hanging.

cd REPO_ROOT/src/SIL.XForge.Scripture/ClientApp && timeout 180 npm run test:headless -- --watch=false

Please do not assume that your edits or solutions have fixed the problem. You must verify that the problem is fixed by running the command.

The user has attached the following file paths as relevant context:

• AGENTS.md

Created from VS Code.

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This change is 

[marksvc]

I preserved the results locally.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.02%. Comparing base (9f464e2) to head (2878158).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3748   +/-   ##
=======================================
  Coverage   81.02%   81.02%           
=======================================
  Files         630      630           
  Lines       40632    40632           
  Branches     6603     6598    -5     
=======================================
  Hits        32922    32922           
  Misses       6676     6676           
  Partials     1034     1034           

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