fix: 归一化报工归属工时分配

tests/test_report_allocations.py

@@ -238,6 +238,30 @@ def test_blank_overtime_meal_deduction_is_clipped_like_metrics():
     ]
 
 
+def test_same_device_item_split_inside_meal_is_rescaled_to_metrics_effective_minutes():
+    start_at = datetime(2026, 7, 25, 8, 0)
+    second_started_at = datetime(2026, 7, 25, 12, 0)
+    end_at = datetime(2026, 7, 25, 13, 0)
+    first_item = _item(id=1, good_qty=192, started_at=start_at)
+    second_item = _item(id=2, good_qty=48, started_at=second_started_at)
+    report = _report(start_at, end_at, [first_item, second_item], devices=[_device(start_at)])
+
+    metrics = calculate_report_metrics(start_at, end_at, [first_item, second_item], devices=[_device(start_at)])
+    rows = build_report_allocation_drafts(report)
+
+    assert metrics["effective_minutes"] == 240
+    assert metrics["shift_day_minutes"] == 240
+    assert {first_item.id: first_item.allocated_minutes, second_item.id: second_item.allocated_minutes} == {
+        1: 192,
+        2: 48,
+    }
+    assert [(row.report_item_id, row.effective_minutes, row.day_minutes) for row in rows] == [
+        (1, 192, 192),
+        (2, 48, 48),
+    ]
+    assert sum(row.effective_minutes for row in rows) == 240
+
+
 def test_zero_effective_minutes_falls_back_to_original_report_date():
     item = _item(good_qty=5, defect_qty=1, scrap_qty=0.5, changeover_count=2, process_unit_price_yuan=3)
     report = _report(