测试：收窄 home.suite 的 asTauriListen 返回类型

- asTauriListen 形参返回类型由 Promise<unknown> 改为 Promise<() => void>，与 TauriListen 的 unlisten 契约一致

apps/ai-game-creator-shell/tests/appSurface/home.suite.ts

@@ -50,7 +50,7 @@ function asTauriListen(
   listen: (
     event: string,
     handler: (event: { payload: unknown }) => void,
-  ) => Promise<unknown>,
+  ) => Promise<() => void>,
 ): TauriListen {
   // 泛型 listen 与携带具体负载的 mock 结构上不可兼容，只能用 as unknown as 收敛。
   return listen as unknown as TauriListen;