@KeetWhereabouts of the spellcheck or some kind of "as you type" replacements/hints is where this has to live.
Only if a spellcheck flags words it doesn't find in any of linked glossaries (and it never cases to amaze me how crazy it actually is) this would add a special "active glossary" that would inject links at words it recognizes, akin code editor that highlights keywords or, actually, just like an IDE that displays annotated information of known functions.
simple as typing a new characters name in the story, flagging that as a character to be bio'd and then it created the entry in the glossary.
Well, if it's simply a global right click dialogue option at any word, that's one thing, but if you're by chance envision assistant gimmick that basically goes "hey, this looks like a person name, do you want to create a character card?" all the time, it would need nontrivial context awareness (enough to be touted as AI feature) and even so would become annoying quickly, both by false positives and not triggering when you actually might want it. In either case it's the next level above the basic function of the "active glossary".