feat：优化执行步骤

app/actions/batch.py

@@ -5,10 +5,11 @@
 
 from copy import deepcopy
 
+from app.actions.layout import EXPANDERS
 from app.actions.registry import apply_action
 from app.actions.update import fit_existing_path
 from app.resources.material_fields import check_update_field, find_material
-from app.schemas.actions import Action, AddAction, UpdateAction
+from app.schemas.actions import Action, AddAction, AgentAction, UpdateAction
 from app.schemas.capabilities import DATA_BINDING_ERROR, DATA_BINDING_SUPPORTED
 from app.schemas.component_resource import ComponentCatalog
 from app.schemas.screen import Screen, ScreenNode
@@ -17,12 +18,15 @@ from app.schemas.screen import Screen, ScreenNode
 class BatchError(ValueError):
     """整批中第 index 个动作（从 0 开始）失败，消息里带上序号和目标，模型据此修正"""
 
-    def __init__(self, index: int, action: Action, reason: str):
+    def __init__(self, index: int, action: AgentAction, reason: str):
         self.index = index
         self.reason = reason
-        target = getattr(action, "target_id", None)
-        if target is None:
-            target = action.node.id if isinstance(action, AddAction) else "画布"
+        if isinstance(action, AddAction):
+            target = action.node.id
+        elif ids := getattr(action, "target_ids", None):
+            target = "、".join(ids)
+        else:
+            target = getattr(action, "target_id", "画布")
         super().__init__(f"第 {index + 1} 个动作（{action.type} {target}）：{reason}")
 
 
@@ -57,13 +61,22 @@ def complete_add(action: AddAction, catalog: ComponentCatalog) -> AddAction:
 
 
 def run_batch(
-    screen: Screen, catalog: ComponentCatalog, actions: list[Action]
+    screen: Screen, catalog: ComponentCatalog, actions: list[AgentAction]
 ) -> tuple[list[Action], Screen]:
-    """从原始大屏开始按顺序模拟执行，返回前端要执行的动作和执行后的大屏；第一个错误抛 BatchError"""
+    """从原始大屏开始按顺序模拟执行，返回前端要执行的动作和执行后的大屏；第一个错误抛 BatchError
+
+    布局意图（arrange、align、distribute、set_layout）在这里按当时的大屏展开成 move 和 resize
+    """
     current = screen.model_copy(deep=True)
     completed: list[Action] = []
     for index, action in enumerate(actions):
         try:
+            if expander := EXPANDERS.get(action.type):
+                expanded = expander(current, action)
+                for primitive in expanded:
+                    current = apply_action(current, primitive)
+                completed.extend(expanded)
+                continue
             if isinstance(action, AddAction):
                 action = complete_add(action, catalog)
             elif isinstance(action, UpdateAction):