feat(FN-005): implement frontend foundation with auth and routing

- Add OIDC authentication with PKCE flow
- Create dashboard shell with sidebar and header
- Implement project management UI (list, create, detail)
- Add tool spawn page with tool/project selection
- Create tool instance detail page with status and controls
- Set up React Router with route guards
- Add Zustand auth store and API client with types

apps/web/src/pages/SettingsPage.tsx

@@ -0,0 +1,26 @@
+import { useAuthStore } from '../stores/auth'
+
+export default function SettingsPage() {
+  const { user } = useAuthStore()
+
+  return (
+    <div className="p-6">
+      <h1 className="text-3xl font-bold mb-4">Settings</h1>
+      <div className="max-w-2xl">
+        <div className="p-4 rounded-lg border border-border bg-surface mb-4">
+          <h2 className="text-xl font-semibold mb-2">Profile</h2>
+          <dl className="space-y-2">
+            <div>
+              <dt className="text-sm text-gray-400">Email</dt>
+              <dd>{user?.email}</dd>
+            </div>
+            <div>
+              <dt className="text-sm text-gray-400">Display Name</dt>
+              <dd>{user?.display_name || 'Not set'}</dd>
+            </div>
+          </dl>
+        </div>
+      </div>
+    </div>
+  )
+}