{{/* Application shell: the top bar and the account menu, shared by the member surface (index.html, products.html, billing.html) and the operator surface (operator.html). Pipeline: server.Shell. Convention: docs/design-system.md "Application shell"; contract: chrome-conventions "One shell for both surfaces" and "Session controls live in the account menu on both surfaces". The top bar carries the place and the person's utilities; it carries no section links on either surface, the rail does. The toggler opens the rail (#app-rail) as a drawer below lg and is hidden at lg and up, where the rail is always visible. The account menu's trigger is a {{ deploymentName }} {{ if .IsOperatorSurface }}Operator{{ end }}