Feat/cc1 - #1

Enhanced source display to include clickable links when lesson URLs are available:
- Updated search tools to return source objects with text and optional URLs
- Modified frontend to render clickable links for sources with URLs
- Added source link styling with hover effects
- Maintained backward compatibility with string-only sources

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

- Display sources as individual clickable cards instead of comma-separated list
- Add subtle blue background and borders for better visual separation
- Implement hover effects for enhanced user interaction
- Make entire source container clickable for better UX
- Use structured list layout for improved readability

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

…protocols