Improve presentation of recent comments (mod tools)

[cellio]

https://meta.codidact.com/posts/280047

Moderators have a page where they can see recent comments on the community. This is very useful. Some improvements have been requested to make it even more useful:

1. Include the post title for context. (Does not need to be a link.)
2. Control to toggle showing deleted comments.
3. If possible, and after doing 1, group comments from the same post together under that title instead of repeating the title for each one.
4. Provide a way to jump straight to the comment, not just the post.
5. Add a way to cancel an edit.

1 and 5 seem like they should be straightforward. 4 seems like it could use the same approach as for comment notifications. I don't know how complicated 2 and 3 are; if they're of a different scale we can spin them off into separate issues.

[cellio]

The page now has links to the specific comments, addressing 4.