FEATURE: Create individual lesson detail pages

[jt14den]

Goal

Create individual detail pages for each lesson at /lessons/[slug] route showing full metadata and external lesson link.

Tasks

• Create dynamic route at src/pages/lessons/[slug].astro
• Generate unique slugs from lesson names
• Design lesson detail page layout
• Display all relevant metadata (name, description, educationalLevel, ossRole, etc.)
• Add "View External Lesson" button linking to lesson URL
• Add breadcrumb navigation back to lessons library
• Add "Related Lessons" section (same pathway/subTopic)
• Ensure responsive design
• Test with various lesson types

Acceptance Criteria

• Each lesson has a unique, accessible detail page
• All metadata displays correctly
• External links open in new tab
• Page matches UC branding
• Mobile responsive

Reference

See STUDENT_README.md Phase 2 Enhancement #1