- Add two new context menu items that appear only on video/picture pages:
  - 👥 Set to Friends Only - sets privacy to friends_only
  - 🌐 Set to All Fetlifers - sets privacy to all_fetlifers
- Context menu items only appear on FetLife video and picture URLs
- Support both direct URLs (/videos/ID, /pictures/ID) and username URLs (/{username}/videos/ID)
- Update context menu click handlers to process privacy settings directly
- Add notifications for successful privacy changes
- Update README.md with new Method 5 for direct privacy setting via context menu
- Update CHANGELOG.md to document the new context menu functionality
- Maintain consistent user experience with popup-based privacy controls