feat: complete Phase 5 (Assembler), Phase 6 (Testing), and Phase 8 (Visual Editor)

frontend/src/layouts/AdminLayout.astro

@@ -8,6 +8,7 @@ const currentPath = Astro.url.pathname;
 
 import SystemStatus from '@/components/admin/SystemStatus';
 import SystemStatusBar from '@/components/admin/SystemStatusBar';
+import { GlobalToaster } from '@/components/providers/CoreProviders';
 
 
 const navGroups = [
@@ -230,5 +231,6 @@ function isActive(href: string) {
 
     <!-- Full-Width System Status Bar -->
     <SystemStatusBar client:load />
+    <GlobalToaster client:load />
   </body>
 </html>

frontend/src/layouts/BaseLayout.astro

@@ -1,5 +1,6 @@
 ---
 import type { Globals, Navigation } from '@/types/schema';
+import { GlobalToaster } from '@/components/providers/CoreProviders';
 
 interface Props {
   title: string;
@@ -274,5 +275,6 @@ const ogImage = image || globals?.logo || '';
         menu?.classList.toggle('hidden');
       });
     </script>
+    <GlobalToaster client:load />
   </body>
 </html>