feat: auto enroll into org as student and oauth improvements

apps/dashboard/src/lib/features/ui/sidebar/org-sidebar/app-logo.svelte

@@ -4,8 +4,13 @@
   import { currentOrg } from '$lib/utils/store/org';
   import { Badge } from '@cio/ui/base/badge';
   import { PLAN_NAMES, PLAN } from '@cio/utils/plans';
+  import { BRAND_ROOT_DOMAIN, TENANT_ROOT_DOMAIN } from '@cio/utils/constants';
 
   const plan = $derived($currentOrg.plans?.[0]?.planName || PLAN.BASIC);
+  const utmSource = $derived(
+    $currentOrg.customDomain ||
+      ($currentOrg.siteName ? `${$currentOrg.siteName}.${TENANT_ROOT_DOMAIN}` : BRAND_ROOT_DOMAIN)
+  );
 </script>
 
 <Sidebar.Menu>
@@ -16,7 +21,7 @@
     >
       {#snippet child({ props })}
         <a
-          href="https://classroomio.com?utm_source={$currentOrg.siteName}.classroomio.com"
+          href="https://{BRAND_ROOT_DOMAIN}?utm_source={utmSource}"
           target="_blank"
           rel="noopener noreferrer"
           {...props}