refactor: remove wait-on dependency

[jonathanKingston]

Asana Task/Github Issue: Instead of #2050

Description

Replace external wait-on package with inline waitForServer function. This reduces transitive dependencies (including axios) while providing equivalent functionality for the fake-extension dev script.

Testing Steps

Checklist

Please tick all that apply:

• I have tested this change locally
• I have tested this change locally in all supported browsers
• This change will be visible to users
• I have added automated tests that cover this change
• I have ensured the change is gated by config
• This change was covered by a ship review
• This change was covered by a tech design
• Any dependent config has been merged

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Note

Replaces the wait-on dependency by adding a local waitForServer poller in injected/scripts/run-fake-extension.js and removes wait-on (and transitives) from dependencies; minor cleanup in mock transport.

• Dev tooling:
  • Server wait logic: Add waitForServer(url) in injected/scripts/run-fake-extension.js and use it instead of wait-on to wait for http://localhost:3220/index.html.
  • Dependency cleanup: Remove wait-on from package.json and prune related entries in package-lock.json.
• Misc:
  • Minor lint/comment cleanup in special-pages/pages/new-tab/app/mock-transport.js.

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[github-actions]

Temporary Branch Update

The temporary branch has been updated with the latest changes. Below are the details:

• Branch Name: pr-releases/pr-2092
• Commit Hash: 462dc777d5c46651d2a10c2df5faea55bb6428cb
• Last Updated: December 9, 2025 at 4:37:45 PM UTC
• Install Command: npm i github:duckduckgo/content-scope-scripts#462dc777d5c46651d2a10c2df5faea55bb6428cb

Please use the above install command to update to the latest version.

[github-actions]

[Beta] Generated file diff

Time updated: Tue, 09 Dec 2025 16:38:13 GMT

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