As for "tell at a glance", do you mean you keep switching profiles, or open multiple profiles in different tabs/windows/apps? It could get complicated as in showing posts from multiple profiles on multi-column UI (Phanpy doesn't do this, @statuzer does).
I prefer to know the details on how the mistake could be made (when composing or liking a post?). It's tough to cover all mistakes (e.g. some folks manage to accidentally delete their repo & now you need a type-to-confirm prompt dialog 😂). IMO if the mistake is not destructive, it can still be undo-ed.