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>

apps/compliance-portal/vite.config.ts

@@ -14,13 +14,16 @@
 
 import { fileURLToPath, URL } from "node:url";
 
+import babel from "@rolldown/plugin-babel";
 import tailwindcss from "@tailwindcss/vite";
 import react from "@vitejs/plugin-react";
 import { defineConfig } from "vite";
 
 // https://vite.dev/config/
+// @vitejs/plugin-react@6 (Vite 8) no longer runs Babel, so the Relay tagged
+// template transform is applied via @rolldown/plugin-babel instead.
 export default defineConfig({
-  plugins: [react(), tailwindcss()],
+  plugins: [react(), babel({ plugins: ["relay"] }), tailwindcss()],
   build: {
     assetsDir: "assets",
   },