Let the treemap in the size analysis tool handle browser back buttons

After navigating into nodes of the treemap, one might be tempted to press the back button on the browser to return to the previous layer. Though that ends up closing the whole treemap and sending the user back to the analysis json upload page. Would be nice to handle it within the page and pop nodes in the treemap instead.

从大小分析工具开始，跟踪如何进入 treemap 节点，以及浏览器后退操作当前如何返回分析 JSON 上传页面。当浏览器后退转到之前查看的 treemap 层级，而不是关闭 treemap，同时正常导航保持不变时，工作就完成了。

由索引模型根据 Issue 内容生成。