Improve staff management UI and add sorting functionality

- Remove WIP badge from staff sidebar navigation
- Make action buttons consistent between Customers and Staff pages
  - Edit button: icon + text with gray border
  - Masquerade button: icon + text with indigo border
  - Verify email button: icon-only with colored border (green/amber)
- Add sortable columns to Staff list (name and role)
- Include migrations for tenant manager role removal

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

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

frontend/src/pages/Tickets.tsx

@@ -122,7 +122,9 @@ const Tickets: React.FC = () => {
     setIsTicketModalOpen(false);
   };
 
-  const isOwnerOrManager = currentUser?.role === 'owner' || currentUser?.role === 'manager';
+  // Owner and staff with can_access_tickets permission have full access
+  const hasFullTicketAccess = currentUser?.role === 'owner' ||
+    (currentUser?.role === 'staff' && currentUser?.effective_permissions?.can_access_tickets);
 
   if (isLoading) {
     return (
@@ -163,7 +165,7 @@ const Tickets: React.FC = () => {
             {t('tickets.title', 'Support Tickets')}
           </h2>
           <p className="text-gray-500 dark:text-gray-400">
-            {isOwnerOrManager
+            {hasFullTicketAccess
               ? t('tickets.descriptionOwner', 'Manage support tickets for your business')
               : t('tickets.descriptionStaff', 'View and create support tickets')}
           </p>