perf(web): 优化大数据量页面切换与聚合性能

apps/web/lib/workspace-engine.test.ts

@@ -1,6 +1,6 @@
 import test from 'node:test';
 import assert from 'node:assert/strict';
-import { aggregateWorkItems, getWorkspacePendingCount } from './workspace-engine';
+import { aggregateWorkItems, getWorkspacePendingCount, getWorkspacePendingCountByVersion } from './workspace-engine';
 import type { DevTask } from './dev-task';
 
 test('getWorkspacePendingCount counts unfinished work items only', () => {
@@ -13,6 +13,51 @@ test('getWorkspacePendingCount counts unfinished work items only', () => {
   assert.equal(count, 2);
 });
 
+test('getWorkspacePendingCountByVersion counts unfinished work items in one pass', () => {
+  const counts = getWorkspacePendingCountByVersion([
+    { versionId: 'ver-1', completed: false },
+    { versionId: 'ver-1', completed: true },
+    { versionId: 'ver-2', completed: false },
+    { versionId: '', completed: false },
+  ]);
+
+  assert.equal(counts.get('ver-1'), 1);
+  assert.equal(counts.get('ver-2'), 1);
+  assert.equal(counts.has(''), false);
+});
+
+test('aggregateWorkItems returns no items before the current user is known', () => {
+  const unassignedTask = {
+    id: 'dev-unassigned',
+    taskNo: 'DEV-002',
+    versionId: 'ver-1',
+    requirementId: '',
+    title: 'Unassigned task',
+    categoryId: 'frontend',
+    assigneeId: '',
+    priority: 'P1',
+    expectedStartAt: '',
+    expectedEndAt: '',
+    status: 'todo',
+    isBlocked: false,
+    createdBy: 'AI',
+    createdAt: '2026-06-29T09:00:00.000Z',
+    updatedAt: '2026-06-29T09:00:00.000Z',
+  } as DevTask;
+
+  const items = aggregateWorkItems(
+    '',
+    [],
+    [unassignedTask],
+    [],
+    [],
+    new Map([['ver-1', { id: 'ver-1', name: 'V1.0', productName: 'FTB', projectName: 'PM' }]]),
+    new Map(),
+  );
+
+  assert.deepEqual(items, []);
+});
+
 test('aggregateWorkItems uses direct version id for no-requirement dev tasks', () => {
   const task = {
     id: 'dev-no-req',