Fix CodeQL workflow build-mode error and formatting

[Copilot]

Success criteria

• CodeQL workflow executes without build-mode errors
• ESM build analyzed by CodeQL
• Format pipeline check passes

How to test

1. Push changes to trigger CodeQL workflow on PR
2. Verify workflow completes successfully
3. Confirm CodeQL results show analysis of dist/webchat.esm.js
4. Run npm run prettier:check to verify formatting compliance

Security

• No security implications

Additional considerations

• This PR might have performance implications

Documentation Considerations

No documentation changes required. Internal CI/CD workflow configuration only.

---

Changes

JavaScript/TypeScript does not support manual build mode in CodeQL. Changed to none and rely on pre-build step:

- language: javascript-typescript
  build-mode: none  # was: manual

Applied prettier formatting to CodeQL configuration files per repository standards.

---

💬 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:

• download.cypress.io
  • Triggering command: /usr/local/bin/node node index.js --exec install (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)