Center lockup-plus-card and card-stack create-flow steps in the nav–footer band so they are not stuck under the header when the content is shorter than the viewport.

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

app/(app)/create/screens/card/ConflictManagementScreen.tsx

@@ -25,6 +25,7 @@ import InlineTextButton from "../../../../components/buttons/InlineTextButton";
 import { CreateFlowStepShell } from "../../components/CreateFlowStepShell";
 import {
   CREATE_FLOW_CARD_STACK_AREA_MAX_CLASS,
+  CREATE_FLOW_MD_CENTERED_SHELL_CLASS,
   CREATE_FLOW_MD_UP_COLUMN_MAX_CLASS,
 } from "../../components/createFlowLayoutTokens";
 import { ConflictManagementEditFields } from "../../components/methodEditFields";
@@ -726,6 +727,7 @@ export function ConflictManagementScreen() {
     <CreateFlowStepShell
       variant="wideGridLoosePadding"
       contentTopBelowMd="space-800"
+      className={CREATE_FLOW_MD_CENTERED_SHELL_CLASS}
     >
       <div className="flex w-full min-w-0 flex-col items-center gap-6">
         <div className={CREATE_FLOW_MD_UP_COLUMN_MAX_CLASS}>