Improve video downloader for HF Spaces - Simplify format selection (best quality MP4) - Enable verbose logging for debugging - Add user agent to avoid blocking - Increase retries and timeout - Better error messages with technical details - Sequential fragment downloads for stability

Optimize yt-dlp for HF Spaces - Add network optimizations (IPv4, timeouts, retries) - Improve error handling - Change warning to info message

Add URL download feature - Support YouTube, Instagram, Facebook, Twitter, TikTok - Add VideoDownloader module with yt-dlp - Update UI with URL input option - Auto-cleanup of downloaded videos

Initial commit: Video Highlighter with shot-based processing