Restructure layout: top bar spans full width (Pulse logo left, user
actions right) with continuous bottom border. Sidebar sits below with
no vertical border collision. Remove logo from sidebar. Remove all
transition-colors from nav items to prevent white flash on click.
Sidebar takes full viewport height with Pulse logo at top. No Header
on site pages — UtilityBar in content area provides theme toggle, app
launcher, notifications, and user menu. Non-site authenticated pages
keep static Header. No footer on dashboard pages.
Use h-screen overflow-hidden on the root container for authenticated
views. Sidebar and content fill the remaining height below the header.
Remove footer from dashboard pages. Content scrolls inside its own
container, sidebar stays fixed in place.
Replace floating pill header with static variant for authenticated
views. Add collapsible sidebar with site picker, grouped navigation
(Analytics/Infrastructure), and mobile overlay drawer. Remove
horizontal SiteNav tab bar.
