Add scroll marker using fake scrollbar implementation

[arogl]

Fixes

#368

Changes Proposed in this Pull Request:

• Add scollbar marker to options
• Show markers on scrollbar

Additional Comments and Documentation:

Produced with the help of claude

[pzhlkj6612]

interesting! do you have screenshots?

[arogl]

Options screen

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Matches on news.com.au

It has light and dark scrollbar capability, but not extensively tested

[pzhlkj6612]

The code and L10N strings in this PR don't seem to be consistent with the existing style and design, and there are some useless if-else and try-catch statements.

I've modified your changes in arogl#1. PLease check. The code in "content/highlighter.js" needs more cleanup and I'm working on it.

You can directly merge that PR if it looks good to you. The merge commit can be preserved, and you don't need to force-push. The maintainer will squash all commits during PR merging.

I believe that keeping things consistent will help future developers. I also believe that we will compose some linter rules for this project then.

[pzhlkj6612]

Thank you for merging the code.

Now I'm continuing working on it. I think all markers in the virtual scrollbar should be added and removed simultaneously with the addition or removal of occurrences on the page, then the procedure will look more tidy and more integrated.