- Add /presentations page with all 11 talks from canvas-website
- Each title is a clickable #hash anchor that copies shareable URL
- Auto-scrolls to hash target on page load
- Styled to match home page: cursor effect, animated blobs, tags, glass cards
- Replace 6 generic AI stock images with custom dark-theme illustrations
matching the site's purple/teal color palette
- Add Presentations nav button to hero section
- Add sonner Toaster for copy-link toast notifications
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
