feat(admin): persist sidebar collapsed sections state in sessionStorage

src/features/admin/components/AdminSidebar.js

@@ -34,6 +34,13 @@ const AdminSidebar = ({ isMobileMenuOpen, setIsMobileMenuOpen, appName, enabledM
         return initial;
     });
 
+    useEffect(() => {
+        try {
+            const stored = sessionStorage.getItem('zen-admin-sidebar-collapsed');
+            if (stored !== null) setCollapsedSections(new Set(JSON.parse(stored)));
+        } catch {}
+    }, []);
+
     const toggleSection = (sectionId) => {
         setCollapsedSections(prev => {
             const next = new Set(prev);
@@ -42,6 +49,9 @@ const AdminSidebar = ({ isMobileMenuOpen, setIsMobileMenuOpen, appName, enabledM
             } else {
                 next.add(sectionId);
             }
+            try {
+                sessionStorage.setItem('zen-admin-sidebar-collapsed', JSON.stringify([...next]));
+            } catch {}
             return next;
         });
     };