Hacker News - Keyword Highlighter + Dark Mode + Split View Comments + Story Links

Highlights posts containing specific keywords, applies dark mode theme, opens comments in split view with clickable buttons, and opens ALL links (including those in comment split view) in new windows on the right side. Prevents web pages from opening within the comment split view. Implements strict CSP with nonce-based execution for robust XSS protection. FIXES CSP: Removes frame-ancestors from HTML meta tags and provides instructions for HTTP response header configuration.