Build the Trust Center top navigation in a Relay-wired layout route. The
portal now mounts a Relay environment and provider, and the root layout
loads a query whose fragment feeds the TopBar: brand, ghost-pill nav with
an active state from the router, and a guest "Get Access" button versus an
authenticated user menu. Placeholder section routes keep the nav links and
active state functional until real pages land.
Wire the Relay tagged-template transform via @rolldown/plugin-babel and
set the router basename to the /trust/{slug} path prefix so the app
resolves under its served path.
Signed-off-by: Émile Ré <emile@probo.com>