Add Windows client hint brands override to match header we override natively

[laghee]

Asana Task/Github Issue: https://app.asana.com/1/137249556945/project/72649045549333/task/1208581002806545?focus=true

Description

Adding an override for our client hints brands in the JS API to match those we send in the Sec-CH-UA header and resolve breakage caused by current inconsistency between the two.

Testing Steps

Use privacy test page (duckduckgo/privacy-test-pages#356) on WebView2 build from this branch of C-S-S
OR
Manually compare Sec-Ch-Ua header brands with output of navigator.userAgentData.brands and navigator.userAgentData.getHighEntropyValues(['brands'])

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

Introduces uaChBrands to align navigator.userAgentData brands with Sec-CH-UA (with domain overrides and Edge/WebView2 handling) and adds Windows integration tests and pages.

• Feature:
  • Add uaChBrands content feature (injected/src/features/ua-ch-brands.js) to:
    • Filter Microsoft Edge WebView2 and replace/append Microsoft Edge with a target brand (default DuckDuckGo).
    • Support domain-specific brand via brandName setting (e.g., through conditionalChanges).
    • Override navigator.userAgentData.brands and adjust getHighEntropyValues(['brands','fullVersionList']) accordingly.
  • Enable uaChBrands in feature registries (injected/src/features.js) for Windows and integration.
• Tests:
  • Add Playwright spec integration-test/ua-ch-brands.spec.js and wire into Windows project (playwright.config.js).
  • Add test pages verifying brand override, domain override, and overrideEdge disabled cases.
  • Add corresponding test configs in test-pages/ua-ch-brands/config/*.

^{Written by Cursor Bugbot for commit fcbe6e8. This will update automatically on new commits. Configure here.}

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• To see the specific tasks where the Asana app for GitHub is being used, see below:
  • https://app.asana.com/0/0/1212017506660681

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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-2028
• Commit Hash: c9195bef41098400018ab9182a1b8b9eb90029e8
• Last Updated: November 27, 2025 at 4:06:12 PM UTC
• Install Command: npm i github:duckduckgo/content-scope-scripts#c9195bef41098400018ab9182a1b8b9eb90029e8

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

[github-actions]

[Beta] Generated file diff

Time updated: Thu, 27 Nov 2025 16:06:27 GMT

Android

    - android/adsjsContentScope.js

• android/autofillImport.js
• android/brokerProtection.js
• android/contentScope.js

File has changed

Apple

    - apple/contentScope.js

• apple/contentScopeIsolated.js

File has changed

Chrome-mv3

    - chrome-mv3/inject.js

File has changed

Firefox

    - firefox/inject.js

File has changed

Integration

    - integration/contentScope.js

File has changed

Windows

    - windows/contentScope.js

File has changed