fix(slidev/client): useNav printRange currentRoute query undefined #2231
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slidev 启动时,偶现页面加载失败
const printRange = ref(parseRangeString(slides.value.length, currentRoute.query.range as string | undefined))
提示currentRoute undefined 无法拿到 query

解决方式
const printRange = ref(parseRangeString(slides.value.length, currentRoute?.query?.range as string | undefined))