library.json

{
  "title": "Lesson Library",
  "subtitle": "Pick a lesson to begin",
  "lessons": [
    { "file": "lesson.json",     "title": "Photosynthesis",  "subject": "Biology · Plants",        "emoji": "🌱" },
    { "file": "watercycle.json", "title": "The Water Cycle",  "subject": "Earth Science · Systems", "emoji": "💧" }
  ]
}