feat: add news section with admin editor and public article view

- NewsSection with animated grid background, category filters, featured cards
- AdminNews list page with toggle publish/featured, pagination
- AdminNewsCreate with TipTap rich text editor, URL validation
- NewsArticle detail page with DOMPurify sanitization, Telegram back button
- Toggle component with WCAG 44px touch targets, role=switch
- Prose styles for highlight marks and responsive iframes
- i18n translations (en, ru, zh, fa)

src/types/news.ts

@@ -0,0 +1,59 @@
+export interface NewsArticle {
+  id: number;
+  title: string;
+  slug: string;
+  content: string;
+  excerpt: string | null;
+  category: string;
+  category_color: string;
+  tag: string | null;
+  featured_image_url: string | null;
+  is_published: boolean;
+  is_featured: boolean;
+  published_at: string | null;
+  read_time_minutes: number;
+  views_count: number;
+  author_name?: string | null;
+  created_at: string;
+  updated_at: string | null;
+}
+
+export interface NewsListItem {
+  id: number;
+  title: string;
+  slug: string;
+  excerpt: string | null;
+  category: string;
+  category_color: string;
+  tag: string | null;
+  featured_image_url: string | null;
+  is_published: boolean;
+  is_featured: boolean;
+  published_at: string | null;
+  read_time_minutes: number;
+  views_count: number;
+}
+
+export interface NewsListResponse {
+  items: NewsListItem[];
+  total: number;
+  categories: string[];
+}
+
+export interface NewsCreateRequest {
+  title: string;
+  slug: string;
+  content: string;
+  excerpt: string | null;
+  category: string;
+  category_color: string;
+  tag: string | null;
+  featured_image_url: string | null;
+  is_published: boolean;
+  is_featured: boolean;
+  read_time_minutes: number;
+}
+
+export interface NewsUpdateRequest extends Partial<NewsCreateRequest> {
+  id?: never;
+}