feat: Enhance task access control and session management

- Implemented API and web task access assertions in the task status polling endpoint.
- Added functions to remember and check task access in user sessions.
- Updated task status tests to validate access control based on session data.
- Enhanced download route tests to ensure proper access checks.
- Improved SEO metadata handling with dynamic social preview images.
- Updated sitemap generation to include blog posts and new tools.
- Added a social preview SVG for better sharing on social media platforms.

frontend/src/utils/seo.ts

@@ -17,6 +17,8 @@ export interface LanguageAlternate {
   ogLocale: string;
 }
 
+const DEFAULT_SOCIAL_IMAGE_PATH = '/social-preview.svg';
+
 const LANGUAGE_CONFIG: Record<'en' | 'ar' | 'fr', { hrefLang: string; ogLocale: string }> = {
   en: { hrefLang: 'en', ogLocale: 'en_US' },
   ar: { hrefLang: 'ar', ogLocale: 'ar_SA' },
@@ -42,6 +44,10 @@ export function buildLanguageAlternates(origin: string, path: string): LanguageA
     }));
 }
 
+export function buildSocialImageUrl(origin: string): string {
+  return `${origin}${DEFAULT_SOCIAL_IMAGE_PATH}`;
+}
+
 /**
  * Generate WebApplication JSON-LD structured data for a tool page.
  */