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/useAuth.ts

@@ -122,11 +122,11 @@ export const useIsAuthenticated = (): boolean => {
 /**
  * Get the redirect path based on user role
  * Tenant users go to /dashboard/, platform users go to /
- * Note: Backend maps tenant_owner -> owner, tenant_manager -> manager, etc.
+ * Note: Backend maps tenant_owner -> owner, tenant_staff -> staff, etc.
  */
 const getRedirectPathForRole = (role: string): string => {
   // Tenant roles (as returned by backend after role mapping)
-  const tenantRoles = ['owner', 'manager', 'staff', 'customer'];
+  const tenantRoles = ['owner', 'staff', 'customer'];
   if (tenantRoles.includes(role)) {
     return '/dashboard/';
   }