[FEATURE] Color visited hyperlinks

[lilac1337]

Is your feature request related to a problem? Please describe.

On most web browsers, hyperlinks turn purple if they link to a page you've already visited. I think this is a nice QOL feature that's within the aims of the project. Unfortunately, no Wikipedia app does this currently.

Describe the solution you'd like

When viewing an article, all the hyperlinks within it that are contained within your history change color to distinguish them from articles you have yet to read.

[nsh07]

Will it be fine if the visited page history does not persist when you restart the app? If so, this actually should not be difficult at all to implement. I'll implement this in the next update.

Thanks for using this app!

[lilac1337]

It would be nicer if it went by the full history, which is already persistent. If it's not possible to leverage the current history implementation with this, I suppose it's fine.

[nsh07]

Finding articles from the stored history can make the page loading significantly slower because every link needs to be checked with the entries in the database. I'll try to find a way to implement it, but my original solution seems the easiest and fastest for now.