* add mention autocomplete functionality to article and notification comments
* add cypress tests
* make sure entry transitions dont replay
* undo change to async useeffect covered in other pr
* move search into dynamic import
* exit search if enter pressed in middle of search term
* refactor button activation code
* add a space after a mention is selected
* tweak cypress test for reply to ensure it awaits combobox
* small refactor
a23caead07