NTP: Fix input styling on Windows

[noisysocks]

Asana Task/Github Issue: https://app.asana.com/1/137249556945/project/1209121419454298/task/1210872043151933?focus=true

Description

Two Windows specific fixes:

1. Style input and textarea selection colour to match how it looks in Windows browser.
2. Reduce font weight (which I bumped in Update omnibar widget design and copy #1843) on Windows where its address bar uses 400 instead of 500.

I’m also putting the font into a CSS variable to prevent an easy-to-make mistake where you update the font in the CSS but forget about measureText.

Testing Steps

https://deploy-preview-1862--content-scope-scripts.netlify.app/build/pages/new-tab/?omnibar=true

Test the Search tab and Duck.ai tabs in DuckDuckGo on Windows and macOS. Ensure that the text in both inputs matches what’s in the address bar. Ensure that the selected text in both inputs matches selected text in the address bar.

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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[github-actions]

Temporary Branch Update

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

• Branch Name: pr-releases/pr-1862
• Commit Hash: abd4fdd08c82b5bc71e7e2af302fd57cb2eef3b4
• Last Updated: July 30, 2025 at 10:31:01 AM UTC
• Install Command: npm i github:duckduckgo/content-scope-scripts#abd4fdd08c82b5bc71e7e2af302fd57cb2eef3b4

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

[github-actions]

[Beta] Generated file diff

Time updated: Wed, 30 Jul 2025 10:31:21 GMT

Apple

    - apple/pages/new-tab/dist/index.css

• apple/pages/new-tab/dist/index.js

File has changed

Integration

    - integration/pages/new-tab/dist/index.css

• integration/pages/new-tab/dist/index.js

File has changed

Windows

    - windows/pages/new-tab/dist/index.css

• windows/pages/new-tab/dist/index.js

File has changed