重命名 separated_image_area 为 extracted_area，优化命名一致性并明确区域含义

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

@@ -145,7 +145,7 @@ mod tests {
         let id = NodeId::new("image").unwrap();
         let decisions = vec![BindingDecision::Ok {
             to_node: id.clone(),
-            separated_image_area: BindingArea {
+            extracted_area: BindingArea {
                 global_pos_x_px: 0,
                 global_pos_y_px: 0,
                 width_px: 1,

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

@@ -110,7 +110,7 @@ impl BindingArea {
 #[schemars(deny_unknown_fields)]
 pub enum BindingDecision {
     Ok {
-        separated_image_area: BindingArea,
+        extracted_area: BindingArea,
         to_node: NodeId,
     },
     NeedRework {

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

@@ -37,7 +37,9 @@ pub(super) fn gen_binding_prompt(nodes: Vec<&SeparationNode>) -> String {
   ```
   {SHARED_SEPARATION_REQ}
   ```
-  You need to recognize and review the separation:
+  You need to recognize and review the separation using the given tool.
+  field notes:
+    * extracted_area MUST be the recognized area from the processed image, INSTEAD OF from the src image.
 
   these node need handle:
   "#

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

@@ -512,7 +512,7 @@ pub(crate) async fn separate_ui_impl(
             for decision in &binding.decisions {
                 if let BindingDecision::Ok {
                     to_node,
-                    separated_image_area,
+                  extracted_area: separated_image_area,
                 } = decision
                 {
                     let cut_path = sidecar.join(format!("cut-{}.png", to_node.as_str()));