清理合并命令测试中的无用导入

移除组件类型未再使用的测试模块导入。

apps/ai-game-creator-shell/src-tauri/src/ui_editor/commands/merge.rs

@@ -525,7 +525,6 @@ mod tests {
         materialize, validate_merge_input_state, validate_merge_plan_shape, MAX_MERGE_INPUT_DEPTH,
         MAX_MERGE_INPUT_NODES, MAX_MERGE_PLAN_DEPTH, MAX_MERGE_PLAN_NODES,
     };
-    use crate::ui_editor::component::Component;
     use crate::ui_editor::layout::children_display_mode::ChildrenDisplayMode;
     use crate::ui_editor::layout::control_layout::ControlLayout;
     use crate::ui_editor::layout::node::{Node, NodeMetadata, NodeSource, StageStatus};