needs some interaction polishing, and some concept of a rollup, but otherwise it's looking very sweet.
1)The toolbar dropdown should toggle editor coverage highlighting. The "Analyze/Show coverage info" menu item serves no valuable purpose.
2)The project menu annotation needs to be done for packages/modules/source roots, not just classes. That would give me all the I need for rollups.
3)It's tougher than it should be to indicate via pattern which classes should be covered, since you can't select a package from the class browser.
Again, excellent work.