删掉会话投影里无人使用的 generateCode 包装

src/view/ui-editor/useUiEditorPage.ts 移除 save.generateCode 及其实现：全仓只有 saveAndGenerateCode 与 stateStore.generateCode 有消费者，这个包装失败时静默返回 null，留着容易让后续调用方拿到没有原因的 null

apps/ai-game-creator-shell/src/view/ui-editor/useUiEditorPage.ts

@@ -1367,31 +1367,6 @@ export function useUiEditorSession(
     }
   }
 
-  async function generateCode() {
-    if (
-      !resourceId ||
-      isGenerating ||
-      isSaving ||
-      isLoading ||
-      isAiRunning ||
-      loadError ||
-      persistedRevision === null ||
-      editor.isLocked
-    ) {
-      return null;
-    }
-    setIsGenerating(true);
-    try {
-      return await editor.runWithStateLocked(() =>
-        stateStore.generateCode(resourceId),
-      );
-    } catch {
-      return null;
-    } finally {
-      setIsGenerating(false);
-    }
-  }
-
   async function saveAndGenerateCode() {
     if (
       !resourceId ||
@@ -1630,7 +1605,6 @@ export function useUiEditorSession(
       hasWarnings: () => postCheckIssuesForSave(editor.state).length > 0,
       warnings: () => postCheckIssuesForSave(editor.state),
       save,
-      generateCode,
       saveAndGenerateCode,
     },
   };