enableSpa开启SPA 模式不生效

[Ecode]

Describe the bug

enableSpa: true
开启SPA 模式不生效

Reproduction

import { defineConfig } from "islandjs";

export default defineConfig({
enableSpa: true,
});

Expected behavior

期望可以使用SPA 模式

System Info

macos

Additional context

No response

Validations

• Read the docs
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.