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/about/page.tsx

@@ -1,7 +1,7 @@
 "use client";
 
 import { SectionEditor } from "../_components/SectionEditor";
-import { InputField, TextareaField } from "../_components/FormField";
+import { InputField } from "../_components/FormField";
 import { ArrayEditor } from "../_components/ArrayEditor";
 
 interface AboutData {
@@ -23,12 +23,14 @@ export default function AboutEditorPage() {
             label="Параграфы"
             items={data.paragraphs}
             onChange={(paragraphs) => update({ ...data, paragraphs })}
+            inline
             renderItem={(text, _i, updateItem) => (
-              <TextareaField
-                label={`Параграф`}
+              <textarea
                 value={text}
-                onChange={updateItem}
-                rows={3}
+                onChange={(e) => updateItem(e.target.value)}
+                rows={2}
+                className="w-full rounded-lg border border-white/10 bg-neutral-800 px-3 py-2 text-sm text-white placeholder-neutral-500 outline-none hover:border-gold/30 focus:border-gold transition-colors resize-none"
+                placeholder="Текст параграфа..."
               />
             )}
             createItem={() => ""}