fix(layout): remove duplicate displayNumber fields and fix page signature ref

Drop the redundant displayNumber declarations from HeaderFooterPage,
ResolvedHeaderFooterPage, and the layout-bridge page builder, keeping the
section-aware variant. Correct the renderer page context signature to read
displayPageNumber instead of the nonexistent pageNumberDisplayNumber.

Author: luccas-harbour

packages/layout-engine/contracts/src/index.ts

@@ -2260,7 +2260,6 @@ export type HeaderFooterType = 'default' | 'first' | 'even' | 'odd';
 export type HeaderFooterPage = {
   number: number;
   fragments: Fragment[];
-  displayNumber?: number;
   numberText?: string;
   /** Section-aware numeric page value before formatting. */
   displayNumber?: number;

packages/layout-engine/contracts/src/resolved-layout.ts

@@ -452,8 +452,6 @@ export function isResolvedDrawingItem(item: ResolvedPaintItem): item is Resolved
 /** A resolved header/footer page — mirrors HeaderFooterPage but with resolved items. */
 export type ResolvedHeaderFooterPage = {
   number: number;
-  /** Numeric page number after section numbering restart/offset. Used for OOXML odd/even parity. */
-  displayNumber?: number;
   numberText?: string;
   /** Section-aware numeric page value before formatting. */
   displayNumber?: number;

packages/layout-engine/layout-bridge/src/layoutHeaderFooter.ts

@@ -350,7 +350,6 @@ export async function layoutHeaderFooterWithCache(
       measures: Measure[];
       fragments: HeaderFooterLayout['pages'][0]['fragments'];
       numberText?: string;
-      displayNumber?: number;
     }> = [];
 
     for (const pageNum of pagesToLayout) {
@@ -392,7 +391,6 @@ export async function layoutHeaderFooterWithCache(
         measures,
         fragments: fragmentsWithLines,
         numberText: displayText,
-        displayNumber,
       });
     }
 
@@ -412,7 +410,6 @@ export async function layoutHeaderFooterWithCache(
         displayNumber: p.displayNumber,
         fragments: p.fragments,
         numberText: p.numberText,
-        displayNumber: p.displayNumber,
         blocks: p.blocks,
         measures: p.measures,
       })),

packages/layout-engine/layout-resolved/src/resolveHeaderFooter.ts

@@ -31,7 +31,6 @@ export function resolveHeaderFooterLayout(
       number: page.number,
       displayNumber: page.displayNumber,
       numberText: page.numberText,
-      displayNumber: page.displayNumber,
       items: page.fragments.map((fragment, fragmentIndex) =>
         resolveFragmentItem(fragment, fragmentIndex, page.number - 1, blockMap, blockVersionCache, story),
       ),

packages/layout-engine/painters/dom/src/renderer.ts

@@ -260,12 +260,9 @@ type PageDomState = {
 };
 
 function pageContextSignature(context: FragmentRenderContext): string {
-  return [
-    context.pageNumber,
-    context.totalPages,
-    context.pageNumberText ?? '',
-    context.pageNumberDisplayNumber ?? '',
-  ].join('|');
+  return [context.pageNumber, context.totalPages, context.pageNumberText ?? '', context.displayPageNumber ?? ''].join(
+    '|',
+  );
 }
 
 function hasPageContextTokenInShapeText(textContent: ShapeTextContent | undefined): boolean {