Navbar

A responsive Bootstrap .navbar. The bar chrome (hamburger toggle + collapsible region) lives in the WC's shadow root and collapses below the breakpoint via a pure-CSS state machine, so it works server-rendered with JavaScript disabled. Place the brand in <BsNavbarBrand slot="brand">, left items as default <BsNavbarItem> children, and right-aligned items with slot="end". A <BsNavbarDropdown> opens a <BsDropdownMenu> panel.