fix: refresh token re-reads role from DB; remove staff stats cards

- /api/auth/refresh now fetches current role from DB instead of using
  stale Redis payload — role changes now take effect on next page refresh
  without requiring re-login. Also deactivates token if user.active=false.
- Removed role-count stat cards from staff page (user request)

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

src/pages/UsersPage.tsx

@@ -1025,10 +1025,8 @@ export function UsersPage() {
     }
   }
 
-  const stats = {
-    total:  users.length,
-    active: users.filter(u => u.isActive).length,
-  }
+  const totalUsers  = users.length
+  const activeUsers = users.filter(u => u.isActive).length
 
   return (
     <div className="p-4 md:p-6 space-y-5">
@@ -1036,7 +1034,7 @@ export function UsersPage() {
       <div className="flex items-center justify-between">
         <div>
           <h1 className="text-xl font-bold text-slate-900 dark:text-slate-100">Сотрудники</h1>
-          <p className="text-sm text-slate-500 dark:text-slate-400">{stats.total} пользователей · {stats.active} активных</p>
+          <p className="text-sm text-slate-500 dark:text-slate-400">{totalUsers} пользователей · {activeUsers} активных</p>
         </div>
         {tab === 'staff' && (
           <button className="btn-primary" onClick={openCreate}>
@@ -1066,25 +1064,6 @@ export function UsersPage() {
 
       {tab === 'staff' && (
         <>
-          {/* Stats */}
-          <div className="grid grid-cols-2 md:grid-cols-4 gap-3">
-            {(Object.entries(ROLE_META) as [StaffRole, typeof ROLE_META[StaffRole]][]).map(([role, meta]) => {
-              const count = users.filter(u => u.role === role).length
-              return (
-                <div key={role} className="card p-4 cursor-pointer hover:shadow-card-hover transition-shadow"
-                  onClick={() => setRoleFilter(roleFilter === role ? 'all' : role)}>
-                  <div className="flex items-center gap-2 mb-1">
-                    <meta.icon size={14} className="text-slate-500 dark:text-slate-400" />
-                    <span className={cn('text-xs font-medium px-1.5 py-0.5 rounded-full', meta.color)}>
-                      {meta.label}
-                    </span>
-                  </div>
-                  <p className="text-2xl font-bold text-slate-900 dark:text-slate-100">{count}</p>
-                </div>
-              )
-            })}
-          </div>
-
           {/* Filters */}
           <div className="flex gap-3 flex-wrap">
             <div className="relative flex-1 min-w-48">