chore: upgrade dependencies, restructure shared libs, and fix UI

- Upgrade Nx 22.1.1 → 22.6.3 and all patch/minor dependencies
- Restructure shared libs: move business logic from utils to service
- Consolidate shadcn-ui into ui lib with atomic design pattern
- Fix container centering for landing app (Tailwind v4 compatibility)
- Fix button styling by updating @source directive in globals.css
- Fix SiCss3 → SiCss rename in react-icons 5.6
- Fix duplicate useSession export conflict
- Remove dead code, comments, and unused files

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/qrcampaign/src/app/admin/campaigns/page.tsx

@@ -221,7 +221,6 @@ export default function CampaignsPage() {
         <DataTable data={campaigns} columns={columns} pageSize={10} />
       )}
 
-      {/* Create Campaign Modal */}
       {showCreateModal && (
         <div className="fixed inset-0 bg-black/50 flex items-center justify-center z-50">
           <div className="bg-white rounded-lg p-6 w-full max-w-md">

apps/qrcampaign/src/app/admin/users/page.tsx

@@ -31,7 +31,6 @@ export default function UsersPage() {
 
   const handleUpdateRole = async (userId: string, currentRole: string) => {
     if (editingUserId === userId) {
-      // Save the role
       try {
         await userService.updateUserRole(userId, selectedRole);
         setEditingUserId(null);
@@ -42,7 +41,6 @@ export default function UsersPage() {
         alert('Failed to update user role');
       }
     } else {
-      // Start editing
       setEditingUserId(userId);
       setSelectedRole(currentRole);
     }