fix: conform site.scss to new frontend-base CSS ownership model

Move site.scss to the repo root and stop re-importing app stylesheets: per
the updated frontend-base guidance, the composing site owns global styles
and apps manage their own.

Use @openedx/brand-openedx directly (no need for an alias since
package.json and site.scss are themselves configuration), and bump it to
v2.

Also add notificationsApp to the site configs.

Co-Authored-By: Claude <noreply@anthropic.com>

Author: arbrandes

package.json

@@ -40,7 +40,7 @@
     ]
   },
   "dependencies": {
-    "@edx/brand": "npm:@openedx/brand-openedx@^1.2.3",
+    "@openedx/brand-openedx": "^2.0.0",
     "@openedx/frontend-app-authn": "^1.0.0-alpha || 0.0.0-dev",
     "@openedx/frontend-app-learner-dashboard": "^1.0.0-alpha || 0.0.0-dev",
     "@openedx/frontend-app-instructor-dashboard": "^1.0.0-alpha || 0.0.0-dev",

site.config.build.tsx

@@ -2,8 +2,9 @@ import { EnvironmentTypes, SiteConfig, footerApp, headerApp, shellApp } from '@o
 import { authnApp } from '@openedx/frontend-app-authn';
 import { instructorDashboardApp } from '@openedx/frontend-app-instructor-dashboard';
 import { learnerDashboardApp } from '@openedx/frontend-app-learner-dashboard';
+import { notificationsApp } from '@openedx/frontend-app-notifications';
 
-import './src/site.scss';
+import './site.scss';
 
 const siteConfig: SiteConfig = {
   siteId: 'frontend-template-site',
@@ -21,6 +22,7 @@ const siteConfig: SiteConfig = {
     authnApp,
     learnerDashboardApp,
     instructorDashboardApp,
+    notificationsApp,
   ],
   externalRoutes: [
     {

site.config.dev.tsx

@@ -2,8 +2,9 @@ import { EnvironmentTypes, SiteConfig, footerApp, headerApp, shellApp } from '@o
 import { authnApp } from '@openedx/frontend-app-authn';
 import { instructorDashboardApp } from '@openedx/frontend-app-instructor-dashboard';
 import { learnerDashboardApp } from '@openedx/frontend-app-learner-dashboard';
+import { notificationsApp } from '@openedx/frontend-app-notifications';
 
-import './src/site.scss';
+import './site.scss';
 
 const siteConfig: SiteConfig = {
   siteId: 'frontend-template-dev',
@@ -21,6 +22,7 @@ const siteConfig: SiteConfig = {
     authnApp,
     learnerDashboardApp,
     instructorDashboardApp,
+    notificationsApp,
   ],
   externalRoutes: [
     {

site.scss

@@ -0,0 +1,3 @@
+@use '@openedx/frontend-base/shell/app.scss' as shell;
+@use '@openedx/brand-openedx/core.min.css';
+@use '@openedx/brand-openedx/light.min.css';