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/hooks/useCustomers.ts

@@ -38,6 +38,7 @@ const transformCustomer = (c: any): Customer => ({
   paymentMethods: [],
   user_data: c.user_data,
   notes: c.notes || '',
+  email_verified: c.email_verified ?? false,
 });
 
 /**
@@ -208,3 +209,20 @@ export const useDeleteCustomer = () => {
     },
   });
 };
+
+/**
+ * Hook to verify a customer's email address
+ */
+export const useVerifyCustomerEmail = () => {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async (id: string) => {
+      const { data } = await apiClient.post(`/customers/${id}/verify_email/`);
+      return data;
+    },
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['customers'] });
+    },
+  });
+};