Release 1.29.2

Navbar dropdowns open again. A top link's dropdown (Live's "Go Live" → Dashboard) opened but was cut off: it hangs below the links row, which scrolls sideways (overflow-x: auto) and so clips anything below it. The menu is now fixed-positioned under its link whenever it can show (hover, keyboard focus, a tap), measured from the box a filtered or transformed bar makes for fixed children. The usage notes at the top of navbar.js moved to the README ("The navbar"), which keeps the file inside its 29 KB brotli budget (28.7 KB).