fix(painter): preserve cached SECTIONPAGES fallback

Author: luccas-harbour

packages/layout-engine/painters/dom/src/runs/text-run.test.ts

@@ -37,6 +37,12 @@ describe('resolveRunText', () => {
     expect(resolveRunText(run, { ...context, sectionPageCount: 7 })).toBe('7');
   });
 
+  it('preserves cached SECTIONPAGES text when section page count context is missing', () => {
+    const run: TextRun = { text: '42', token: 'sectionPageCount', fontFamily: 'Arial', fontSize: 12 };
+
+    expect(resolveRunText(run, context)).toBe('42');
+  });
+
   it('formats SECTIONPAGES tokens with run-local page number format', () => {
     const run: TextRun = {
       text: '0',

packages/layout-engine/painters/dom/src/runs/text-run.ts

@@ -146,7 +146,10 @@ export const resolveRunText = (run: Run, context: FragmentRenderContext): string
     return context.totalPages ? String(context.totalPages) : (run.text ?? '');
   }
   if (runToken === 'sectionPageCount') {
-    const sectionPageCount = context.sectionPageCount ?? context.totalPages ?? 1;
+    const sectionPageCount = context.sectionPageCount;
+    if (sectionPageCount == null) {
+      return run.text ?? '';
+    }
     if ('pageNumberFormat' in run && run.pageNumberFormat) {
       return formatPageNumber(sectionPageCount, run.pageNumberFormat);
     }