perf(web): 优化大数据量页面切换与聚合性能

apps/web/lib/workspace-engine.ts

@@ -37,6 +37,7 @@ export function aggregateWorkItems(
   requirementVersionMap: Map<string, string>,
 ): WorkItem[] {
   const items: WorkItem[] = [];
+  if (!userName.trim()) return items;
 
   // Plans: owner === userName
   plans.filter((p) => p.owner === userName).forEach((p) => {
@@ -127,6 +128,17 @@ export function getWorkspacePendingCount(items: ReadonlyArray<Pick<WorkItem, 'co
   return items.reduce((sum, item) => sum + (item.completed ? 0 : 1), 0);
 }
 
+export function getWorkspacePendingCountByVersion(
+  items: ReadonlyArray<Pick<WorkItem, 'versionId' | 'completed'>>,
+): Map<string, number> {
+  const map = new Map<string, number>();
+  for (const item of items) {
+    if (!item.versionId || item.completed) continue;
+    map.set(item.versionId, (map.get(item.versionId) ?? 0) + 1);
+  }
+  return map;
+}
+
 export const WORK_ITEM_TYPE_LABEL: Record<WorkItemType, string> = {
   plan_research: '调研',
   plan_product: '产品方案',