Add Trust Center top bar to compliance portal

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>

package-lock.json

@@ -44,6 +44,8 @@
         "relay-runtime": "^21.0.1"
       },
       "devDependencies": {
+        "@babel/core": "^7.29.0",
+        "@rolldown/plugin-babel": "^0.2.3",
         "@tailwindcss/vite": "^4.3.1",
         "@types/node": "^25.9.3",
         "@types/react": "^19.2.17",