fix: skip a11y test for OgImage/Compare (server-rendered image)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Adebesin-Cell

test/unit/a11y-component-coverage.spec.ts

@@ -26,6 +26,7 @@ const SKIPPED_COMPONENTS: Record<string, string> = {
   'OgImage/BlogPost.vue': 'OG Image component - server-rendered image, not interactive UI',
   'OgImage/Default.vue': 'OG Image component - server-rendered image, not interactive UI',
   'OgImage/Package.vue': 'OG Image component - server-rendered image, not interactive UI',
+  'OgImage/Compare.vue': 'OG Image component - server-rendered image, not interactive UI',
 
   // Client-only components with complex dependencies
   'Header/AuthModal.client.vue': 'Complex auth modal with navigation - requires full app context',