fix(ui): let ConfirmButton's dialog wear the destructive style

ConfirmButton took a `destructive` prop and dropped it on the way to its
dialog, so every delete, revoke and remove built on it confirmed with a
neutral primary button while ConfirmDialog confirmed the same kind of act
in red. The prop is forwarded now, and the call sites whose act takes
something away pass it. A guard holds every confirmation whose slot names
a destroying act to the destructive style; resets stay neutral.

src/app/coach/plans/page.tsx

@@ -191,6 +191,7 @@ function CoachPlansBody({ readOnly }: { readOnly: boolean }) {
           {(readOnly || group === "past") && (
             <ConfirmButton
               slot="coach-plan-delete"
+              destructive
               variant="ghost"
               size="sm"
               className="min-h-9"