fix: comprehensive UI/UX accessibility and usability improvements

Public site: skip-to-content link, mobile menu focus trap + Escape key,
aria-current on nav, keyboard navigation for carousels/tabs/articles,
ARIA roles (tablist/tab/tabpanel, combobox/listbox, region, dialog),
form labels + aria-describedby, 44px touch targets, semantic HTML
(<time>, <del>), prefers-reduced-motion on Hero scroll hijack,
mobile schedule filters, URL hash sync on scroll for correct refresh.

Admin panel: password toggle aria-label, toast aria-live regions,
SelectField keyboard navigation (Arrow/Enter/Escape), aria-invalid
on validation errors, sidebar hamburger aria-label/expanded,
nav aria-label, ArrayEditor aria-expanded on collapsible items.

src/app/admin/layout.tsx

@@ -107,13 +107,14 @@ export default function AdminLayout({
           </Link>
           <button
             onClick={() => setSidebarOpen(false)}
+            aria-label="Закрыть меню"
             className="lg:hidden text-neutral-400 hover:text-white"
           >
             <X size={20} />
           </button>
         </div>
 
-        <nav className="flex-1 overflow-y-auto p-3 space-y-1">
+        <nav aria-label="Навигация панели управления" className="flex-1 overflow-y-auto p-3 space-y-1">
           {NAV_ITEMS.map((item) => {
             const Icon = item.icon;
             const active = isActive(item.href);
@@ -131,7 +132,7 @@ export default function AdminLayout({
                 <Icon size={18} />
                 {item.label}
                 {item.href === "/admin/bookings" && unreadTotal > 0 && (
-                  <span className="ml-auto rounded-full bg-red-500 text-white text-[10px] font-bold min-w-[18px] h-[18px] flex items-center justify-center px-1">
+                  <span aria-label={`${unreadTotal} непрочитанных`} className="ml-auto rounded-full bg-red-500 text-white text-xs font-bold min-w-[18px] h-[18px] flex items-center justify-center px-1">
                     {unreadTotal > 99 ? "99+" : unreadTotal}
                   </span>
                 )}
@@ -165,6 +166,8 @@ export default function AdminLayout({
         <header className="flex items-center gap-3 border-b border-white/10 px-4 py-3 lg:hidden">
           <button
             onClick={() => setSidebarOpen(true)}
+            aria-label="Открыть меню"
+            aria-expanded={sidebarOpen}
             className="text-neutral-400 hover:text-white"
           >
             <Menu size={24} />