I’m the developer of a desktop-first Lemmy client called Alexandrite.
You can link to communities/users by typing the full name/instance stuff out, but I don’t have any search/auto-complete stuff for either of those yet.
Oh yeah, I added a few hotkeys too, forgot to mention that! You can find them documented on the hotkey help page.
Nope, it does everything client-side as of about a month ago.
Oops forgot to post links, I edited the post.
I host Alexandrite at https://alexandrite.app/ and several instances also host Alexandrite on their own domains, like https://a.lemmy.world