ui: add initial Profile hover previews
The idea with these is that on notedeck you can just hover your cursor over a profile link to see the profile. I just have a stub for now, but full design coming soon after. Also simplify the preview system even further with a macro. In the future I imagine we can grep every preview in the codebase, and then include this as a string inside this macro. This is some kind of template metaprogramming insanity but in theory it could work. Signed-off-by: William Casarin <jb55@jb55.com>
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