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RouterEvent type

路由事件，路由跳转时触发

使用 Discriminated Union 表达不同 action 对应的 payload 语义： - navigateTo → payload 为目标 Route - navigateBack → payload 为回退后的新栈长度（见 Router.navigateBack()） - historyPop → 由浏览器 popstate 触发，无 payload

Signature:

type RouterEvent = {
    action: 'navigateTo';
    payload: Route;
} | {
    action: 'navigateBack';
    payload: number;
} | {
    action: 'historyPop';
    payload: undefined;
};

References: Route