feat: complete onboarding flow

app/pages/auth/setup.vue

@@ -1,7 +1,7 @@
 <script setup lang="ts">
 import { deriveKey } from '~/utils/crypto';
 
-const { signIn } = useAuth();
+const { signIn, fetchSession } = useAuth();
 
 definePageMeta({
     layout: 'auth',
@@ -127,8 +127,11 @@ const submit = async () => {
     const key = await deriveKey(form.password, res.data.user.id);
     localStorage.setItem('encryptionKey', JSON.stringify(key));
 
-    // straight on to connecting a provider, the instance is useless without one
-    return navigateTo('/welcome');
+    // the next steps are for admins only, so make sure the role is loaded
+    await fetchSession();
+
+    // on to the rest of the setup: who can register, then a first provider
+    return navigateTo('/setup/instance');
 };
 </script>
 
@@ -160,6 +163,8 @@ const submit = async () => {
             </div>
 
             <template v-else>
+                <OnboardingSetupSteps :current="1"></OnboardingSetupSteps>
+
                 <p
                     class="px-3 py-2.5 rounded-lg bg-[var(--bg-container)] border border-[var(--color-border)] text-sm leading-snug text-[var(--text-secondary)]">
                     No accounts exist yet. The account you create here becomes the