Keep a guest community logo on review and on the published rule.

Sign-in was clearing the staged file before it uploaded, and review only read the server URL, so a chosen logo disappeared after the upload step.

app/(app)/create/screens/review/FinalReviewScreen.tsx

@@ -28,6 +28,7 @@ import {
 } from "../../components/FinalReviewChipEditModal";
 import { FinalReviewCommunityContextEditModal } from "../../components/FinalReviewCommunityContextEditModal";
 import { FinalReviewTitleEditModal } from "../../components/FinalReviewTitleEditModal";
+import { useCommunityAvatarDisplayUrl } from "../../hooks/useCommunityAvatarDisplayUrl";
 import { usePreviewSurfaceColor } from "../../hooks/usePreviewSurfaceColor";
 import { useCreateFlowNavigation } from "../../hooks/useCreateFlowNavigation";
 import { createFlowStepForFacetGroup } from "../../utils/facetGroupToCreateFlowStep";
@@ -251,11 +252,7 @@ export function FinalReviewScreen({
   const descriptionEmptyHint =
     variant === "editPublished" ? t("communityContextEditModal.emptyHint") : undefined;
 
-  const avatarUrl =
-    typeof state.communityAvatarUrl === "string" &&
-    state.communityAvatarUrl.trim().length > 0
-      ? state.communityAvatarUrl.trim()
-      : null;
+  const avatarUrl = useCommunityAvatarDisplayUrl(state.communityAvatarUrl);
   const storedFallback =
     typeof state.previewSurfaceColor === "string"
       ? state.previewSurfaceColor