[WIP] Fix highlight issue in high contrast theme

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

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This section details on the original issue you should resolve

<issue_title>How to disable highlight in the high contrast theme?</issue_title>
<issue_description>you cannot see the words with the high contrast theme,i try to use this:

"ep_comments_page": {"highlightSelectedText": false}

It did not work.</issue_description>

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