feat(ai): 优化拆解重跑与结果展示

apps/web/lib/work-effort-engine.test.ts

@@ -21,6 +21,15 @@ test('aggregateWorkEffort calculates weighted progress by estimate', () => {
   assert.equal(result.progress, 75);
 });
 
+test('aggregateWorkEffort preserves sub-half-hour AI estimates', () => {
+  const result = aggregateWorkEffort([
+    { estimateHours: 0.2, actualHours: 0, progress: 50 },
+  ]);
+
+  assert.equal(result.estimateHours, 0.2);
+  assert.equal(result.progress, 50);
+});
+
 test('aggregateWorkEffort falls back to item average when estimates are zero', () => {
   const result = aggregateWorkEffort([
     { estimateHours: 0, actualHours: 0, progress: 50 },