Offer the engine's five size bands as exclusive ranges, so a count of 100 has one home and a group cannot continue without a size.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/(app)/create/CreateFlowLayoutClient.tsx

@@ -85,7 +85,10 @@ import {
   methodCardFacetSectionForConfirmStep,
   type CustomRuleConfirmFooterStep,
 } from "./utils/customRuleConfirmFooterSteps";
-import { getDefaultFooterLabel } from "./utils/createFlowFooterLabels";
+import {
+  getDefaultFooterLabel,
+  isCommunitySizeStepBlocked,
+} from "./utils/createFlowFooterLabels";
 import { useAuthModal } from "../../contexts/AuthModalContext";
 import { useMessages, useTranslation } from "../../contexts/MessagesContext";
 import { PostLoginDraftTransfer } from "./PostLoginDraftTransfer";
@@ -985,7 +988,12 @@ function CreateFlowLayoutContent({
                 palette="default"
                 size="xsmall"
                 disabled={
-                  isPublishing || (isFinalReviewLike && !sessionResolved)
+                  isPublishing ||
+                  (isFinalReviewLike && !sessionResolved) ||
+                  isCommunitySizeStepBlocked(
+                    currentStep,
+                    state.selectedCommunitySizeIds,
+                  )
                 }
                 className={CREATE_FLOW_FOOTER_BUTTON_CLASS}
                 onClick={() => {