various fixes

app-expo/src/features/memoir/framework-chapter-keys.ts

@@ -35,3 +35,17 @@ export function buildFrameworkChapterPlaceholders(
     wordCount: 0,
   }));
 }
+
+/**
+ * 列表页始终展示 8 个框架槽位：已有章节用接口数据，其余槽位仍用框架占位（与「零章节」时一致）。
+ */
+export function mergeFrameworkChaptersWithFetched(
+  placeholders: ChapterViewModel[],
+  fetched: ChapterViewModel[],
+): ChapterViewModel[] {
+  const byOrder = new Map<number, ChapterViewModel>();
+  for (const vm of fetched) {
+    byOrder.set(vm.orderIndex, vm);
+  }
+  return placeholders.map((p) => byOrder.get(p.orderIndex) ?? p);
+}