Add "undo" button

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Or some way to go to the recently made edit/page to manually correct it post adding the link with OAbot

I would decline this. There's a link to the user page, which I regularly use to reach the contributions and the undo button. Alternatively, one can go back to the previous page, click the title and go to the history. It's standard wiki editing, we don't need to rebuild MediaWiki core in python.