The current folder is the page title; the crumbs under it list its ancestors from Your Files, all links in --text-secondary, hover --text. Five or more collapse to first, ..., last two; click to expand. One ancestor, or a phone, shows a single back link.

One flat list. Active item: --nav-item-bg-active and 500 weight, no yellow. Counts and badges right-align. Settings, billing and log out live in the account menu, not here.