Moves the hero rendering to the layout level so the banner shows the
full golden arch and sky behind the page title, search bar, and
sub-tabs row. TopBar and the search input backgrounds are now
transparent so the banner reads through cleanly.
Wires up react-router-dom so the sidebar nav actually navigates between
pages, with route-aware active highlighting and dynamic page titles.
Extracts Glance content into its own page component and adds a new
Infrastructure page matching the mockup: status cards, resource
distribution/cost breakdown donuts, infra map, top resources by
utilization, resource trend chart, recent activity, and footer stats.
