fix: add missing icons and use Utils.showToast() for notifications

Icons:
- Add cloud-download, cloud-upload, and key icons

Notifications:
- Replace alert() with Utils.showToast() in companies.js
- Replace alert() with Utils.showToast() in content-pages.js
- Add noqa comment for intentional fallback in components.js

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

static/admin/js/init-alpine.js

@@ -28,9 +28,11 @@ function data() {
   // Default state: Platform Administration open, others closed
   const defaultSections = {
     platformAdmin: true,
+    productCatalog: false,
     contentMgmt: false,
     devTools: false,
-    monitoring: false
+    monitoring: false,
+    settingsSection: false
   };
 
   function getSidebarSectionsFromStorage() {
@@ -60,7 +62,10 @@ function data() {
     vendors: 'platformAdmin',
     users: 'platformAdmin',
     customers: 'platformAdmin',
-    marketplace: 'platformAdmin',
+    // Product Catalog
+    'marketplace-products': 'productCatalog',
+    'vendor-products': 'productCatalog',
+    marketplace: 'productCatalog',
     // Content Management
     'platform-homepage': 'contentMgmt',
     'content-pages': 'contentMgmt',
@@ -72,7 +77,12 @@ function data() {
     'code-quality': 'devTools',
     // Platform Monitoring
     imports: 'monitoring',
-    logs: 'monitoring'
+    logs: 'monitoring',
+    // Settings
+    settings: 'settingsSection',
+    profile: 'settingsSection',
+    'api-keys': 'settingsSection',
+    'notifications-settings': 'settingsSection'
   };
 
   return {