Enable sharing vulnerabilities and reports on social media with rich previews.

Acceptance Criteria:

• Add share buttons (Twitter, LinkedIn, Copy Link)
• Generate OpenGraph meta tags for detail pages:
  • og:title, og:description, og:image, og:url
• Create preview images dynamically or use template
• Add Twitter Card meta tags
• Test previews with social media debuggers
• Track share events for analytics (optional)