fix: 组装页ULD查询无结果提示，修复运抵列表表头分割线颜色

- ULD编号查询getUld接口返回data为null时弹出"未查询到该ULD信息"提示
- 运抵列表子列表表头分割线改用app:dividerColor替代android:background，
  修复MaterialDivider忽略background导致显示偏紫的问题

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

module_gjc/src/main/java/com/lukouguoji/gjc/viewModel/IntExpAssembleStartViewModel.kt

@@ -448,6 +448,8 @@ class IntExpAssembleStartViewModel : BaseViewModel() {
                         assembleFlightDate.value = ""
                         assembleInfoList.value = mutableListOf()
                     }
+                } else {
+                    showToast("未查询到该ULD信息")
                 }
             }
             onFailed = { code, message ->

module_gjc/src/main/res/layout/item_int_exp_arrive.xml

@@ -495,7 +495,7 @@
                 android:id="@+id/divider_header"
                 android:layout_width="match_parent"
                 android:layout_height="1px"
-                android:background="@color/sub_list_divider" />
+                app:dividerColor="@color/sub_list_divider" />
 
             <!-- 子列表 RecyclerView -->
             <androidx.recyclerview.widget.RecyclerView